diff --git a/modules/chain/dap_chain_common.c b/modules/chain/dap_chain_common.c
index dbb610c4f4ad0065bb5fa85226b8e46f46e81e9f..e6ff3354a04fbdbe054957b63737651670986224 100644
--- a/modules/chain/dap_chain_common.c
+++ b/modules/chain/dap_chain_common.c
@@ -216,12 +216,12 @@ void dap_chain_set_offset_limit_json(json_object * a_json_obj_out, size_t *a_sta
     json_object* json_obj_lim = json_object_new_object();
     if (a_offset > 0) {
         *a_start = a_offset;
-        json_object_object_add(json_obj_lim, "offset", json_object_new_int(*a_start));                
+        json_object_object_add(json_obj_lim, "offset", json_object_new_uint64(*a_start));
     }
     *a_and = a_and_count;
     if (a_limit > 0) {
         *a_and = *a_start + a_limit;
-        json_object_object_add(json_obj_lim, "limit", json_object_new_int(*a_and - *a_start));
+        json_object_object_add(json_obj_lim, "limit", json_object_new_uint64(*a_and - *a_start));
     }
     else
         json_object_object_add(json_obj_lim, "limit", json_object_new_string("unlimit"));
diff --git a/modules/service/xchange/dap_chain_net_srv_xchange.c b/modules/service/xchange/dap_chain_net_srv_xchange.c
index ed2ce1a4e71a052ddb0295f76ffdcf32db0160ea..de364a9717de02c291008974decebfed4809e218 100644
--- a/modules/service/xchange/dap_chain_net_srv_xchange.c
+++ b/modules/service/xchange/dap_chain_net_srv_xchange.c
@@ -115,6 +115,10 @@ static bool s_string_append_tx_cond_info( dap_string_t * a_reply_str, dap_chain_
                                           dap_chain_addr_t *a_owner_addr, dap_chain_addr_t *a_buyer_addr, dap_chain_datum_tx_t * a_tx, 
                                           dap_hash_fast_t *a_tx_hash, tx_opt_status_t a_filter_by_status, bool a_append_prev_hash, 
                                           bool a_print_status,bool a_print_ts);
+static bool s_string_append_tx_cond_info_json( json_object * a_json_out, dap_chain_net_t * a_net,
+                                               dap_chain_addr_t *a_owner_addr, dap_chain_addr_t *a_buyer_addr, dap_chain_datum_tx_t * a_tx,
+                                               tx_opt_status_t a_filter_by_status, bool a_print_prev_hash, bool a_print_status, bool a_print_ts);
+
 dap_chain_net_srv_xchange_price_t *s_xchange_price_from_order(dap_chain_net_t *a_net, dap_chain_datum_tx_t *a_order, 
                                                     dap_hash_fast_t *a_order_hash, uint256_t *a_fee, bool a_ret_is_invalid);
 static void s_ledger_tx_add_notify(dap_ledger_t *a_ledger, dap_chain_datum_tx_t *a_tx_in,  
@@ -235,7 +239,7 @@ int dap_chain_net_srv_xchange_init()
 
     "srv_xchange token_pair -net <net_name> list all [-limit <limit>] [-offset <offset>]\n"
         "\tList of all token pairs\n"
-    "srv_xchange token_pair -net <net_name> rate average -token_from <token_ticker> -token_to <token_ticker>\n"
+    "srv_xchange token_pair -net <net_name> rate average [-time_from <From_time>] [-time_to <To_time>]\n"
         "\tGet average rate for token pair <token from>:<token to> from <From time> to <To time> \n"
     "srv_xchange token_pair -net <net_name> rate history -token_from <token_ticker> -token_to <token_ticker> [-time_from <From_time>] [-time_to <To_time>] [-limit <limit>] [-offset <offset>]\n"
         "\tPrint rate history for token pair <token from>:<token to> from <From time> to <To time>\n"
@@ -1238,7 +1242,7 @@ dap_chain_net_srv_xchange_price_t *s_xchange_price_from_order(dap_chain_net_t *a
  * @param a_str_reply
  * @return
  */
-static int s_cli_srv_xchange_order(int a_argc, char **a_argv, int a_arg_index, void **a_str_reply)
+static int s_cli_srv_xchange_order(int a_argc, char **a_argv, int a_arg_index, json_object **a_json_arr_reply)
 {
     enum {
         CMD_NONE, CMD_CREATE, CMD_REMOVE, CMD_UPDATE, CMD_HISTORY, CMD_STATUS
@@ -1265,63 +1269,72 @@ static int s_cli_srv_xchange_order(int a_argc, char **a_argv, int a_arg_index, v
         case CMD_CREATE: {
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-net", &l_net_str);
             if (!l_net_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'order create' requires parameter -net");
-                return -2;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_REQ_PARAM_NET_ERR, "Command 'order create' requires parameter -net");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_REQ_PARAM_NET_ERR;
             }
             l_net = dap_chain_net_by_name(l_net_str);
             if (!l_net) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Network %s not found", l_net_str);
-                return -3;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_NET_NOT_FOUND_ERR, "Command 'order create' requires parameter -net");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_NET_NOT_FOUND_ERR;
             }
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-token_sell", &l_token_sell_str);
             if (!l_token_sell_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'order create' requires parameter -token_sell");
-                return -5;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_PARAM_TOKEN_SELL_ERR,
+                                                "Command 'order create' requires parameter -token_sell");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_PARAM_TOKEN_SELL_ERR;
             }
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-token_buy", &l_token_buy_str);
             if (!l_token_buy_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'order create' requires parameter -token_buy");
-                return -5;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_PARAM_TOKEN_BUY_ERR,
+                                                "Command 'order create' requires parameter -token_buy");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_PARAM_TOKEN_BUY_ERR;
             }
             if (!dap_ledger_token_ticker_check(l_net->pub.ledger, l_token_buy_str)) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Token ticker %s not found", l_token_buy_str);
-                return -6;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_PARAM_TICKR_NOTF_ERR,
+                                                "Token ticker %s not found", l_token_buy_str);
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_PARAM_TICKR_NOTF_ERR;
             }
 
             if (!strcmp(l_token_sell_str, l_token_buy_str)){
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "token_buy and token_sell must be different!");
-                return -7;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_TOKEN_EQUAL_ERR,
+                                                "token_buy and token_sell must be different!");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_TOKEN_EQUAL_ERR;
             }
 
             const char *l_val_sell_str = NULL, *l_val_rate_str = NULL;
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-value", &l_val_sell_str);
             if (!l_val_sell_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'order create' requires parameter -value");
-                return -8;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CRTE_REQ_PARAM_VALUE_ERR,
+                                                "Command 'order create' requires parameter -value");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CRTE_REQ_PARAM_VALUE_ERR;
             }
             uint256_t l_datoshi_sell = dap_chain_balance_scan(l_val_sell_str);
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-rate", &l_val_rate_str);
             if (!l_val_rate_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'order create' requires parameter -rate");
-                return -8;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CRTE_REQ_PARAM_RATE_ERR,
+                                                "Command 'order create' requires parameter -rate");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CRTE_REQ_PARAM_RATE_ERR;
             }
             uint256_t l_rate = dap_chain_balance_coins_scan(l_val_rate_str);
             const char *l_fee_str = NULL;
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-fee", &l_fee_str);
             if (!l_fee_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'order create' requires parameter -fee");
-                return -20;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CRTE_REQ_PARAM_FEE_ERR,
+                                                "Command 'order create' requires parameter -fee");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CRTE_REQ_PARAM_FEE_ERR;
             }
             uint256_t l_fee = dap_chain_balance_scan(l_fee_str);
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-w", &l_wallet_str);
             if (!l_wallet_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'order create' requires parameter -w");
-                return -10;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CRTE_REQ_PARAM_W_ERR,
+                                                "Command 'order create' requires parameter -w");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CRTE_REQ_PARAM_W_ERR;
             }
             dap_chain_wallet_t *l_wallet = dap_chain_wallet_open(l_wallet_str, dap_chain_wallet_get_path(g_config), NULL);
             if (!l_wallet) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Specified wallet not found");
-                return -11;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CRTE_WALLET_NOT_FOUND_ERR,
+                                                "Specified wallet not found");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CRTE_WALLET_NOT_FOUND_ERR;
             }
             const char* l_sign_str = dap_chain_wallet_check_sign(l_wallet);
             char *l_hash_ret = NULL;
@@ -1329,72 +1342,91 @@ static int s_cli_srv_xchange_order(int a_argc, char **a_argv, int a_arg_index, v
             dap_chain_wallet_close(l_wallet);
             switch (ret_code) {
                 case XCHANGE_CREATE_ERROR_OK: {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "%s\nSuccessfully created order %s", l_sign_str, l_hash_ret);
+                    json_object* json_obj_order = json_object_new_object();
+                    json_object_object_add(json_obj_order, "status", json_object_new_string("Successfully created"));
+                    json_object_object_add(json_obj_order, "sign", json_object_new_string(l_sign_str));
+                    json_object_object_add(json_obj_order, "hash", json_object_new_string(l_hash_ret));
+                    json_object_array_add(*a_json_arr_reply, json_obj_order);
                     DAP_DELETE(l_hash_ret);
-                    return 0;
+                    return DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_OK;
                 }
                 case XCHANGE_CREATE_ERROR_INVALID_ARGUMENT: {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Some parameters could not be set during a function call");
-                    return -24;
+                    dap_json_rpc_error_add(*a_json_arr_reply, XCHANGE_CREATE_ERROR_INVALID_ARGUMENT,
+                                                "Some parameters could not be set during a function call");
+                    return -XCHANGE_CREATE_ERROR_INVALID_ARGUMENT;
                 }
                 case XCHANGE_CREATE_ERROR_TOKEN_TICKER_SELL_IS_NOT_FOUND_LEDGER: {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Token ticker %s not found", l_token_sell_str);
-                    return -6;
+                    dap_json_rpc_error_add(*a_json_arr_reply, XCHANGE_CREATE_ERROR_TOKEN_TICKER_SELL_IS_NOT_FOUND_LEDGER,
+                                                "Token ticker %s not found", l_token_sell_str);
+                    return -XCHANGE_CREATE_ERROR_TOKEN_TICKER_SELL_IS_NOT_FOUND_LEDGER;
                 }
                 case XCHANGE_CREATE_ERROR_TOKEN_TICKER_BUY_IS_NOT_FOUND_LEDGER: {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Token ticker %s not found", l_token_buy_str);
-                    return -6;
+                    dap_json_rpc_error_add(*a_json_arr_reply, XCHANGE_CREATE_ERROR_TOKEN_TICKER_BUY_IS_NOT_FOUND_LEDGER,
+                                            "Token ticker %s not found", l_token_buy_str);
+                    return -XCHANGE_CREATE_ERROR_TOKEN_TICKER_BUY_IS_NOT_FOUND_LEDGER;
                 }
                 case XCHANGE_CREATE_ERROR_RATE_IS_ZERO: {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Format -rate n.n = buy / sell (eg: 1.0, 1.135)");
-                    return -9;
+                    dap_json_rpc_error_add(*a_json_arr_reply, XCHANGE_CREATE_ERROR_RATE_IS_ZERO,
+                                            "Format -rate n.n = buy / sell (eg: 1.0, 1.135)");
+                    return -XCHANGE_CREATE_ERROR_RATE_IS_ZERO;
                 }
                 case XCHANGE_CREATE_ERROR_FEE_IS_ZERO: {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Format -value <unsigned integer 256>");
-                    return -21;
+                    dap_json_rpc_error_add(*a_json_arr_reply, XCHANGE_CREATE_ERROR_FEE_IS_ZERO,
+                                            "Format -value <unsigned integer 256>");
+                    return -XCHANGE_CREATE_ERROR_FEE_IS_ZERO;
                 }
                 case XCHANGE_CREATE_ERROR_VALUE_SELL_IS_ZERO: {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Format -value <unsigned integer 256>");
-                    return -9;
+                    dap_json_rpc_error_add(*a_json_arr_reply, XCHANGE_CREATE_ERROR_VALUE_SELL_IS_ZERO,
+                                            "Format -value <unsigned integer 256>");
+                    return -XCHANGE_CREATE_ERROR_VALUE_SELL_IS_ZERO;
                 }
                 case XCHANGE_CREATE_ERROR_INTEGER_OVERFLOW_WITH_SUM_OF_VALUE_AND_FEE: {
                     log_it(L_ERROR, "Integer overflow with sum of value and fee");
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Integer overflow with sum of value and fee");
-                    return -22;
+                    dap_json_rpc_error_add(*a_json_arr_reply, XCHANGE_CREATE_ERROR_INTEGER_OVERFLOW_WITH_SUM_OF_VALUE_AND_FEE,
+                                                "Integer overflow with sum of value and fee");
+                    return -XCHANGE_CREATE_ERROR_INTEGER_OVERFLOW_WITH_SUM_OF_VALUE_AND_FEE;
                 }
                 case XCHANGE_CREATE_ERROR_NOT_ENOUGH_CASH_FOR_FEE_IN_SPECIFIED_WALLET: {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "%s\nNot enough cash for fee in specified wallet", l_sign_str);
-                    return -23;
+                    dap_json_rpc_error_add(*a_json_arr_reply, XCHANGE_CREATE_ERROR_NOT_ENOUGH_CASH_FOR_FEE_IN_SPECIFIED_WALLET,
+                                                "%s\nNot enough cash for fee in specified wallet", l_sign_str);
+                    return -XCHANGE_CREATE_ERROR_NOT_ENOUGH_CASH_FOR_FEE_IN_SPECIFIED_WALLET;
                 }
                 case XCHANGE_CREATE_ERROR_NOT_ENOUGH_CASH_IN_SPECIFIED_WALLET: {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "%s\nNot enough cash in specified wallet", l_sign_str);
-                    return -12;
+                    dap_json_rpc_error_add(*a_json_arr_reply, XCHANGE_CREATE_ERROR_NOT_ENOUGH_CASH_IN_SPECIFIED_WALLET,
+                                                "%s\nNot enough cash in specified wallet", l_sign_str);
+                    return -XCHANGE_CREATE_ERROR_NOT_ENOUGH_CASH_IN_SPECIFIED_WALLET;
                 }
                 case XCHANGE_CREATE_ERROR_MEMORY_ALLOCATED: {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Out of memory");
-                    return -1;
+                    dap_json_rpc_error_add(*a_json_arr_reply, XCHANGE_CREATE_ERROR_MEMORY_ALLOCATED,
+                                                "Out of memory");
+                    return -XCHANGE_CREATE_ERROR_MEMORY_ALLOCATED;
                 }
                 case XCHANGE_CREATE_ERROR_CAN_NOT_COMPOSE_THE_CONDITIONAL_TRANSACTION: {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "%s\nCan't compose the conditional transaction", l_sign_str);
-                    return -14;
+                    dap_json_rpc_error_add(*a_json_arr_reply, XCHANGE_CREATE_ERROR_CAN_NOT_COMPOSE_THE_CONDITIONAL_TRANSACTION,
+                                                "%s\nCan't compose the conditional transaction", l_sign_str);
+                    return -XCHANGE_CREATE_ERROR_CAN_NOT_COMPOSE_THE_CONDITIONAL_TRANSACTION;
                 }
                 case XCHANGE_CREATE_ERROR_CAN_NOT_PUT_TRANSACTION_TO_MEMPOOL: {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "%s\nCan't compose the conditional transaction", l_sign_str);
-                    return -15;
+                    dap_json_rpc_error_add(*a_json_arr_reply, XCHANGE_CREATE_ERROR_CAN_NOT_PUT_TRANSACTION_TO_MEMPOOL,
+                                                "%s\nCan't compose the conditional transaction", l_sign_str);
+                    return -XCHANGE_CREATE_ERROR_CAN_NOT_PUT_TRANSACTION_TO_MEMPOOL;
                 }
             }
         } break;
 
         case CMD_HISTORY:{
+            json_object* l_json_obj_order = NULL;
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-net", &l_net_str);
             if (!l_net_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'order history' requires parameter -net");
-                return -2;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_REQ_PARAM_NET_ERR,
+                                                "Command 'order history' requires parameter -net");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_REQ_PARAM_NET_ERR;
             }
             l_net = dap_chain_net_by_name(l_net_str);
             if (!l_net) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Network %s not found", l_net_str);
-                return -3;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_NET_NOT_FOUND_ERR,
+                                                "Network %s not found", l_net_str);
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_NET_NOT_FOUND_ERR;
             }
 
             const char * l_order_hash_str = NULL;
@@ -1404,45 +1436,46 @@ static int s_cli_srv_xchange_order(int a_argc, char **a_argv, int a_arg_index, v
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-addr", &l_addr_hash_str);
 
             if (!l_order_hash_str && ! l_addr_hash_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'order history' requires parameter -order or -addr" );
-                return -12;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_REQ_PARAM_ORDER_ADDR_ERR,
+                                                "Command 'order history' requires parameter -order or -addr" );
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_REQ_PARAM_ORDER_ADDR_ERR;
             }
 
             if(l_addr_hash_str){
                 dap_chain_addr_t *l_addr = dap_chain_addr_from_str(l_addr_hash_str);
                 if (!l_addr) {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Cannot convert "
+                    dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_CAN_NOT_CONVERT_ERR, "Cannot convert "
                                                                    "string '%s' to binary address.", l_addr_hash_str);
-                    return -14;
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_CAN_NOT_CONVERT_ERR;
                 }
                 if (dap_chain_addr_check_sum(l_addr) != 0 ) {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Incorrect address wallet");
-                    return -15;
+                    dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_INCORRECT_ADDR_ERR, "Incorrect address wallet");
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_INCORRECT_ADDR_ERR;
                 }
                 if (l_addr->net_id.uint64 != l_net->pub.id.uint64) {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Address %s does not belong to the %s network.",
+                    dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_DOES_NOT_BELONG_ERR, "Address %s does not belong to the %s network.",
                                                       l_addr_hash_str, l_net->pub.name);
-                    return -16;
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_DOES_NOT_BELONG_ERR;
                 }
 
                 dap_list_t *l_tx_list = dap_chain_net_get_tx_cond_all_for_addr(l_net,l_addr, c_dap_chain_net_srv_xchange_uid );
-                dap_string_t * l_str_reply = dap_string_new("");
 
                 dap_hash_fast_t l_hash_curr ={};
                 bool l_from_wallet_cache = dap_chain_wallet_cache_tx_find(l_addr, NULL, NULL, &l_hash_curr, NULL) == 0 ? true : false;
                 l_hash_curr = (dap_hash_fast_t){0};
                 size_t l_total = 0;
-                if(l_from_wallet_cache){  
-                    dap_string_t * l_str_reply = dap_string_new("");
+                if(l_from_wallet_cache){
 
                     xchange_orders_cache_net_t* l_cache = NULL;
                     if(s_xchange_cache_state == XCHANGE_CACHE_ENABLED){
                         l_cache = s_get_xchange_cache_by_net_id(l_net->pub.id);
                         if(!l_cache){
-                            dap_cli_server_cmd_set_reply_text(a_str_reply, "No history");
+                            dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_DOES_NO_HISTORY_ERR, "No history");
                             break;
                         }
                     }
+                    l_json_obj_order = json_object_new_object();
+                    json_object* l_json_order_arr = json_object_new_array();
                     dap_chain_wallet_cache_iter_t *l_iter = dap_chain_wallet_cache_iter_create(*l_addr);
                     for(dap_chain_datum_tx_t *l_datum_tx = dap_chain_wallet_cache_iter_get(l_iter, DAP_CHAIN_WALLET_CACHE_GET_FIRST);
                             l_datum_tx; l_datum_tx = dap_chain_wallet_cache_iter_get(l_iter, DAP_CHAIN_WALLET_CACHE_GET_NEXT))
@@ -1455,45 +1488,55 @@ static int s_cli_srv_xchange_order(int a_argc, char **a_argv, int a_arg_index, v
                             HASH_FIND(hh, l_cache->cache, l_iter->cur_hash, sizeof(dap_hash_fast_t), l_item); 
                             if (!l_item)
                                 continue;
-                            
-                            if (s_string_append_tx_cond_info(l_str_reply, l_net, &l_item->seller_addr, 
+                            json_object* l_json_order = json_object_new_object();
+                            if (s_string_append_tx_cond_info_json(l_json_order, l_net, &l_item->seller_addr,
                                 l_item->tx_type == TX_TYPE_EXCHANGE ?  &l_item->tx_info.exchange_info.buyer_addr : NULL, 
-                                l_datum_tx, l_iter->cur_hash, TX_STATUS_ALL, true, true, false))
+                                l_datum_tx, TX_STATUS_ALL, true, true, false)) {
                                 
                                 l_total++;
                             } else {
-                                if (s_string_append_tx_cond_info(l_str_reply, l_net, NULL, NULL, l_datum_tx, l_iter->cur_hash, TX_STATUS_ALL, true, true, false))
+                                if (s_string_append_tx_cond_info_json(l_json_order, l_net, NULL, NULL, l_datum_tx, TX_STATUS_ALL, true, true, false))
                                     l_total++;
+                            }
+                            json_object_array_add(l_json_order_arr, l_json_order);
                         }
                     }
                     dap_chain_wallet_cache_iter_delete(l_iter);
-                    
+                    json_object_object_add(l_json_obj_order, "orders", l_json_order_arr);
                     if(!l_total)
-                        dap_cli_server_cmd_set_reply_text(a_str_reply, "No history");
+                        dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_DOES_NO_HISTORY_ERR, "No history");
                     else {
-                        dap_string_append_printf(l_str_reply, "Found %"DAP_UINT64_FORMAT_U, l_total);
-                        *a_str_reply = dap_string_free(l_str_reply, false);
+                        char *l_orders = dap_strdup_printf("Found %"DAP_UINT64_FORMAT_U, l_total);
+                        json_object_object_add(l_json_obj_order, "number of orders", json_object_new_string(l_orders));
+                        DAP_DELETE(l_orders);
                     }
+
                 } else { 
                     dap_list_t *l_tx_list = dap_chain_net_get_tx_cond_all_for_addr(l_net,l_addr, c_dap_chain_net_srv_xchange_uid );
-                    dap_string_t * l_str_reply = dap_string_new("");
 
                     if (l_tx_list){
                         dap_list_t *l_tx_list_temp = l_tx_list;
-                        dap_string_append_printf(l_str_reply, "Wallet %s history:\n\n", l_addr_hash_str);
+                        l_json_obj_order = json_object_new_object();
+                        json_object* l_json_order_arr = json_object_new_array();
+                        json_object_object_add(l_json_obj_order, "Wallet %s history:\n\n", json_object_new_string(l_addr_hash_str));
+
                         while(l_tx_list_temp ){
                             dap_chain_datum_tx_t * l_tx_cur = (dap_chain_datum_tx_t*) l_tx_list_temp->data;
                             dap_hash_fast_t l_hash = {};
                             dap_hash_fast(l_tx_cur, dap_chain_datum_tx_get_size(l_tx_cur), &l_hash);
-                            if (s_string_append_tx_cond_info(l_str_reply, l_net, NULL, NULL, l_tx_cur, &l_hash, TX_STATUS_ALL, true, true, false))
+                            json_object* l_json_order = json_object_new_object();
+                            if (s_string_append_tx_cond_info_json(l_json_order, l_net, NULL, NULL, l_tx_cur, TX_STATUS_ALL, true, true, false))
                                 l_total++;
                             l_tx_list_temp = l_tx_list_temp->next;
+                            json_object_array_add(l_json_order_arr, l_json_order);
                         }
+                        json_object_object_add(l_json_obj_order, "orders", l_json_order_arr);
                         dap_list_free(l_tx_list);
-                        dap_string_append_printf(l_str_reply, "Found %"DAP_UINT64_FORMAT_U, l_total);
-                        *a_str_reply = dap_string_free(l_str_reply, false);
+                        char *l_orders = dap_strdup_printf("Found %"DAP_UINT64_FORMAT_U, l_total);
+                        json_object_object_add(l_json_obj_order, "number of orders", json_object_new_string(l_orders));
+                        DAP_DELETE(l_orders);
                     }else{
-                        dap_cli_server_cmd_set_reply_text(a_str_reply, "No history");
+                        dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_DOES_NO_HISTORY_ERR, "No history");
                     }
                 }
                 DAP_DELETE(l_addr);
@@ -1503,51 +1546,58 @@ static int s_cli_srv_xchange_order(int a_argc, char **a_argv, int a_arg_index, v
             if(l_order_hash_str){
                 dap_hash_fast_t l_order_tx_hash = {};
                 dap_chain_hash_fast_from_str(l_order_hash_str, &l_order_tx_hash);
+                l_json_obj_order = json_object_new_object();
                 if(s_xchange_cache_state == XCHANGE_CACHE_DISABLED){
                     dap_chain_datum_tx_t * l_tx = dap_chain_net_get_tx_by_hash(l_net, &l_order_tx_hash, TX_SEARCH_TYPE_NET);
                     if( l_tx){
                         xchange_tx_type_t l_tx_type = dap_chain_net_srv_xchange_tx_get_type(l_net->pub.ledger, l_tx, NULL, NULL, NULL);
                         char *l_tx_hash = dap_chain_hash_fast_to_str_new(&l_order_tx_hash);
                         if(l_tx_type != TX_TYPE_ORDER){
-                            dap_cli_server_cmd_set_reply_text(a_str_reply, "Datum with hash %s is not order. Check hash.", l_tx_hash);
+                            json_object_object_add(l_json_obj_order, "datum status", json_object_new_string("is not order"));
+                            json_object_object_add(l_json_obj_order, "datum hash", json_object_new_string(l_tx_hash));
                         } else {
                             dap_chain_net_srv_xchange_order_status_t l_rc = s_tx_check_for_open_close(l_net,l_tx);
                             if(l_rc == XCHANGE_ORDER_STATUS_UNKNOWN){
-                                dap_cli_server_cmd_set_reply_text(a_str_reply, "WRONG TX %s", l_tx_hash);
+                                json_object_object_add(l_json_obj_order, "WRONG TX", json_object_new_string(l_tx_hash));
                             }else{
-                                dap_string_t * l_str_reply = dap_string_new("");
-                                dap_string_append_printf(l_str_reply, "Order %s history:\n\n", l_order_hash_str);
+                                json_object_object_add(l_json_obj_order, "history for order", json_object_new_string(l_order_hash_str));
                                 dap_list_t *l_tx_list = dap_chain_net_get_tx_cond_chain(l_net, &l_order_tx_hash, c_dap_chain_net_srv_xchange_uid );
                                 dap_list_t *l_tx_list_temp = l_tx_list;
+                                json_object* l_json_order_arr = json_object_new_array();
                                 while(l_tx_list_temp ){
+                                    json_object* l_json_order = json_object_new_object();
                                     dap_chain_datum_tx_t * l_tx_cur = (dap_chain_datum_tx_t*) l_tx_list_temp->data;
                                     dap_hash_fast_t l_hash = {};
                                     dap_hash_fast(l_tx_cur, dap_chain_datum_tx_get_size(l_tx_cur), &l_hash);
-                                    s_string_append_tx_cond_info(l_str_reply, l_net, NULL, NULL, l_tx_cur, &l_hash, TX_STATUS_ALL, true, true, false);
+                                    s_string_append_tx_cond_info_json(l_json_order, l_net, NULL, NULL, l_tx_cur, TX_STATUS_ALL, true, true, false);
                                     l_tx_list_temp = l_tx_list_temp->next;
+                                    json_object_array_add(l_json_order_arr, l_json_order);
                                 }
                                 dap_list_free(l_tx_list);
-                                *a_str_reply = dap_string_free(l_str_reply, false);
+                                json_object_object_add(l_json_obj_order, "orders", l_json_order_arr);
                             }
                         }
                     }else
-                        dap_cli_server_cmd_set_reply_text(a_str_reply, "No history");
+                        dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_DOES_NO_HISTORY_ERR, "No history");
                 } else {
-                    dap_string_t * l_str_reply = dap_string_new("");
+
                     xchange_orders_cache_net_t* l_cache = NULL;
                     dap_list_t *l_tx_cache_list = NULL;
                     l_cache = s_get_xchange_cache_by_net_id(l_net->pub.id);
                     xchange_tx_cache_t* l_item = NULL;
-                    dap_hash_fast_t l_cur_hash = l_order_tx_hash;
+                    dap_hash_fast_t l_cur_hash = l_order_tx_hash;                    
                     HASH_FIND(hh, l_cache->cache, &l_cur_hash, sizeof(dap_hash_fast_t), l_item);
                     if (!l_item){
-                        dap_cli_server_cmd_set_reply_text(a_str_reply, "No history");
-                        return -18;
+                        dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_DOES_NO_HISTORY_ERR, "No history");
+                        return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_DOES_NO_HISTORY_ERR;
                     }
+                    json_object* l_json_order_arr = json_object_new_array();
                     while(l_item){
-                        s_string_append_tx_cond_info(l_str_reply, l_net, &l_item->seller_addr, 
+                                json_object* l_json_order = json_object_new_object();
+                                s_string_append_tx_cond_info_json(l_json_order, l_net, &l_item->seller_addr,
                                 l_item->tx_type == TX_TYPE_EXCHANGE ?  &l_item->tx_info.exchange_info.buyer_addr : NULL, 
-                                l_item->tx, &l_item->hash, TX_STATUS_ALL, true, true, false);
+                                l_item->tx, TX_STATUS_ALL, true, true, false);
+                                json_object_array_add(l_json_order_arr, l_json_order);
                         switch(l_item->tx_type){
                             case TX_TYPE_ORDER:{
                                 l_cur_hash = l_item->tx_info.order_info.next_hash;
@@ -1564,9 +1614,10 @@ static int s_cli_srv_xchange_order(int a_argc, char **a_argv, int a_arg_index, v
                             break;
                         HASH_FIND(hh, l_cache->cache, &l_cur_hash, sizeof(dap_hash_fast_t), l_item);
                     }
-                    *a_str_reply = dap_string_free(l_str_reply, false);
+                    json_object_object_add(l_json_obj_order, "orders", l_json_order_arr);
                 }
             }
+            json_object_array_add(*a_json_arr_reply, l_json_obj_order);
         } break;
 
         case CMD_REMOVE:
@@ -1575,68 +1626,77 @@ static int s_cli_srv_xchange_order(int a_argc, char **a_argv, int a_arg_index, v
             const char * l_fee_str = NULL;
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-net", &l_net_str);
             if (!l_net_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'order %s' requires parameter -net",
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_REQ_PARAM_NET_ERR, "Command 'order %s' requires parameter -net",
                                                                 l_cmd_num == CMD_REMOVE ? "remove" : "update");
-                return -2;
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_REQ_PARAM_NET_ERR;
             }
             dap_chain_net_t *l_net = dap_chain_net_by_name(l_net_str);
             if (!l_net) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Network %s not found", l_net_str);
-                return -3;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_NET_NOT_FOUND_ERR,
+                                                                            "Network %s not found", l_net_str);
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_NET_NOT_FOUND_ERR;
             }
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-w", &l_wallet_str);
             if (!l_wallet_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'order %s' requires parameter -w",
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_REQ_PARAM_W_ERR,
+                                                                            "Command 'order %s' requires parameter -w",
                                                                 l_cmd_num == CMD_REMOVE ? "remove" : "update");
-                return -10;
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_REQ_PARAM_W_ERR;
             }
             dap_chain_wallet_t *l_wallet = dap_chain_wallet_open(l_wallet_str, dap_chain_wallet_get_path(g_config), NULL);
             if (!l_wallet) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Specified wallet not found");
-                return -11;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_WALLET_NOT_FOUND_ERR,
+                                                                            "Specified wallet not found");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_WALLET_NOT_FOUND_ERR;
             }
             const char* l_sign_str = dap_chain_wallet_check_sign(l_wallet);
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-order", &l_order_hash_str);
             if (!l_order_hash_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'order %s' requires parameter -order",
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_REQ_PARAM_ORDER_ADDR_ERR,
+                                                                            "Command 'order %s' requires parameter -order",
                                                                 l_cmd_num == CMD_REMOVE ? "remove" : "update");
-                return -12;
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_REQ_PARAM_ORDER_ADDR_ERR;
             }
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-fee", &l_fee_str);
             if (!l_fee_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'order %s' requires parameter -fee",
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_REQ_PARAM_FEE_ERR,
+                                                                            "Command 'order %s' requires parameter -fee",
                                                   l_cmd_num == CMD_REMOVE ? "remove" : "update");
-                return -12;
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_REQ_PARAM_FEE_ERR;
             }
             uint256_t l_fee = dap_chain_balance_scan(l_fee_str);
             dap_hash_fast_t l_tx_hash = {};
             dap_chain_hash_fast_from_str(l_order_hash_str, &l_tx_hash);
             char *l_tx_hash_ret = NULL;
             int l_ret_code = dap_chain_net_srv_xchange_remove(l_net, &l_tx_hash, l_fee, l_wallet, &l_tx_hash_ret);
+            json_object* json_obj_order = NULL;
             dap_chain_wallet_close(l_wallet);
             switch (l_ret_code) {
                 case XCHANGE_REMOVE_ERROR_OK:
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Order successfully removed. Created inactivate tx with hash %s", l_tx_hash_ret);
+                    json_obj_order = json_object_new_object();
+                    json_object_object_add(json_obj_order, "status", json_object_new_string("Order successfully removed"));
+                    json_object_object_add(json_obj_order, "Created inactivate tx with hash", json_object_new_string(l_tx_hash_ret));
+                    json_object_array_add(*a_json_arr_reply, json_obj_order);
                     DAP_DELETE(l_tx_hash_ret);
                     break;
                 case XCHANGE_REMOVE_ERROR_CAN_NOT_FIND_TX:
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "%s\nSpecified order not found", l_sign_str);
+                    dap_json_rpc_error_add(*a_json_arr_reply, XCHANGE_REMOVE_ERROR_CAN_NOT_FIND_TX, "%s\nSpecified order not found", l_sign_str);
                     break;
                 case XCHANGE_REMOVE_ERROR_CAN_NOT_CREATE_PRICE:
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "%s\nCan't create price object from order", l_sign_str);
+                    dap_json_rpc_error_add(*a_json_arr_reply, XCHANGE_REMOVE_ERROR_CAN_NOT_CREATE_PRICE, "%s\nCan't create price object from order", l_sign_str);
                     break;
                 case XCHANGE_REMOVE_ERROR_FEE_IS_ZERO:
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Can't get fee value.");
+                    dap_json_rpc_error_add(*a_json_arr_reply, XCHANGE_REMOVE_ERROR_FEE_IS_ZERO, "Can't get fee value.");
                     break;
                 case XCHANGE_REMOVE_ERROR_CAN_NOT_INVALIDATE_TX: {
                     dap_chain_datum_tx_t *l_cond_tx = dap_ledger_tx_find_by_hash(l_net->pub.ledger, &l_tx_hash);
                     dap_chain_net_srv_xchange_price_t *l_price = s_xchange_price_from_order(l_net, l_cond_tx, &l_tx_hash, &l_fee, false);
                     const char *l_final_tx_hash_str = dap_chain_hash_fast_to_str_static(&l_price->tx_hash);
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Can't create invalidate transaction from: %s\n", l_final_tx_hash_str);
+                    dap_json_rpc_error_add(*a_json_arr_reply, XCHANGE_REMOVE_ERROR_CAN_NOT_INVALIDATE_TX, "Can't create invalidate transaction from: %s\n", l_final_tx_hash_str);
                     DAP_DELETE(l_price);
                 } break;
                 default:
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "An error occurred with an unknown code: %d.", l_ret_code);
+                    dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_UNKNOWN_ERR, "An error occurred with an unknown code: %d.", l_ret_code);
                     break;
             }
             return l_ret_code;
@@ -1645,19 +1705,22 @@ static int s_cli_srv_xchange_order(int a_argc, char **a_argv, int a_arg_index, v
         case CMD_STATUS: {
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-net", &l_net_str);
             if (!l_net_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'order status' requires parameter -net");
-                return -2;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_REQ_PARAM_NET_ERR,
+                                                            "Command 'order status' requires parameter -net");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_REQ_PARAM_NET_ERR;
             }
             l_net = dap_chain_net_by_name(l_net_str);
             if (!l_net) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Network %s not found", l_net_str);
-                return -3;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_NET_NOT_FOUND_ERR,
+                                                            "Network %s not found", l_net_str);
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_NET_NOT_FOUND_ERR;
             }
             const char * l_order_hash_str = NULL;
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-order", &l_order_hash_str);
             if (!l_order_hash_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'order history' requires parameter -order or -addr" );
-                return -12;
+                dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_REQ_PARAM_ORDER_ADDR_ERR,
+                                                            "Command 'order status' requires parameter -order or -addr" );
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_REQ_PARAM_ORDER_ADDR_ERR;
             }
             dap_hash_fast_t l_order_tx_hash = {};
             dap_chain_hash_fast_from_str(l_order_hash_str, &l_order_tx_hash);
@@ -1681,8 +1744,9 @@ static int s_cli_srv_xchange_order(int a_argc, char **a_argv, int a_arg_index, v
                 HASH_FIND(hh, l_cache->cache, &l_order_tx_hash, sizeof(dap_hash_fast_t), l_item);
                 l_tx = l_item ? l_item->tx : NULL;
                 if (!l_tx){
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Can't find order %s", l_order_hash_str);
-                    return -18;
+                    dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_CANT_FIND_ORDER_ERR,
+                                                            "Can't find order %s", l_order_hash_str);
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_CANT_FIND_ORDER_ERR;
                 }
 
                 switch (l_item->tx_info.order_info.order_status)
@@ -1717,8 +1781,9 @@ static int s_cli_srv_xchange_order(int a_argc, char **a_argv, int a_arg_index, v
             } else {
                 l_tx = dap_ledger_tx_find_by_hash(l_net->pub.ledger, &l_order_tx_hash);
                 if (!l_tx){
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Can't find order %s", l_order_hash_str);
-                    return -18;
+                    dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_CANT_FIND_ORDER_ERR,
+                                                            "Can't find order %s", l_order_hash_str);
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_CANT_FIND_ORDER_ERR;
                 }
 
                 // Find SRV_XCHANGE in_cond item
@@ -1730,37 +1795,42 @@ static int s_cli_srv_xchange_order(int a_argc, char **a_argv, int a_arg_index, v
                 dap_chain_tx_out_cond_t *l_out_prev_cond_item = l_prev_tx ? dap_chain_datum_tx_out_cond_get(l_prev_tx, DAP_CHAIN_TX_OUT_COND_SUBTYPE_SRV_XCHANGE,
                                                                                                 &l_prev_cond_idx) : NULL;
                 if(l_out_prev_cond_item){
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "It's not an order");
-                    return -18;
+                    dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_ITS_NOT_ORDER_ERR,
+                                                            "It's not an order");
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_ITS_NOT_ORDER_ERR;
                 }
 
 
                 dap_chain_tx_out_cond_t *l_out_cond = dap_chain_datum_tx_out_cond_get(l_tx, DAP_CHAIN_TX_OUT_COND_SUBTYPE_SRV_XCHANGE , NULL);
                 if (!l_out_cond || l_out_cond->header.srv_uid.uint64 != DAP_CHAIN_NET_SRV_XCHANGE_ID){
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "It's not an order");
-                    return -18;
+                    dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_ITS_NOT_ORDER_ERR,
+                                                            "It's not an order");
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_ITS_NOT_ORDER_ERR;
                 }
 
                 // TODO add filters to list (tokens, network, etc.)
                 dap_chain_net_srv_xchange_price_t *l_price = s_xchange_price_from_order(l_net, l_tx, &l_order_tx_hash, NULL, true);
                 if( !l_price ){
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Can't get price from order");
-                    return -18;
+                    dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_CANT_GET_PRICE_ERR,
+                                                            "Can't get price from order");
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_CANT_GET_PRICE_ERR;
                 }
 
                 dap_ledger_t * l_ledger = dap_ledger_by_net_name(l_net->pub.name);
                 
                 dap_hash_fast_t l_last_tx_hash = dap_ledger_get_final_chain_tx_hash(l_ledger, DAP_CHAIN_TX_OUT_COND_SUBTYPE_SRV_XCHANGE, &l_price->tx_hash, false);
                 if( dap_hash_fast_is_blank(&l_last_tx_hash) ){
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Can't get last tx cond hash from order");
-                    return -18;
+                    dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_CANT_GET_LAST_TX_ERR,
+                                                            "Can't get last tx cond hash from order");
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_CANT_GET_LAST_TX_ERR;
                 }
 
                 dap_chain_datum_tx_t * l_last_tx = dap_ledger_tx_find_by_hash(l_ledger, &l_last_tx_hash);
                 log_it(L_INFO, "Last tx hash %s", dap_hash_fast_to_str_static(&l_last_tx_hash));
                 if (!l_last_tx){
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Can't find last tx");
-                    return -18;
+                    dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_CANT_FIND_LAST_TX_ERR,
+                                                            "Can't find last tx");
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_CANT_FIND_LAST_TX_ERR;
                 }
 
                 dap_chain_tx_out_cond_t *l_out_cond_last_tx = dap_chain_datum_tx_out_cond_get(l_last_tx, DAP_CHAIN_TX_OUT_COND_SUBTYPE_SRV_XCHANGE , NULL);
@@ -1799,19 +1869,25 @@ static int s_cli_srv_xchange_order(int a_argc, char **a_argv, int a_arg_index, v
             l_proposed_datoshi_str = dap_uint256_uninteger_to_char(l_proposed);
             l_cp_rate = dap_chain_balance_coins_print(l_rate); 
 
-            dap_cli_server_cmd_set_reply_text(a_str_reply, "orderHash: %s\n ts_created: %s\n Status: %s, proposed: %s(%s) %s, amount: %s (%s) %s, filled: %lu%%, rate (%s/%s): %s, net: %s\n\n"
-                                     "owner addr: %s\n\n", l_order_hash_str,
-                                     l_tmp_buf, l_status_order, 
-                                     l_proposed_coins_str ? l_proposed_coins_str : "0.0", 
-                                     l_proposed_datoshi_str ? l_proposed_datoshi_str : "0.0", 
-                                     l_token_sell,
-                                     l_amount_coins_str ? l_amount_coins_str : "0.0",
-                                     l_amount_datoshi_str ? l_amount_datoshi_str : "0",
-                                     l_token_sell, l_percent_completed,
-                                     l_token_buy, l_token_sell,
-                                     l_cp_rate,
-                                     l_net->pub.name, l_owner_addr ? l_owner_addr : "unknown" );
-
+            json_object* json_obj_order = json_object_new_object();
+
+            json_object_object_add(json_obj_order, "orderHash", json_object_new_string(l_order_hash_str));
+            json_object_object_add(json_obj_order, "ts_created", json_object_new_string(l_tmp_buf));
+            json_object_object_add(json_obj_order, "status", json_object_new_string(l_status_order));
+            json_object_object_add(json_obj_order, "amount coins", l_amount_coins_str ? json_object_new_string(l_amount_coins_str)
+                                                                                : json_object_new_string("0.0"));
+            json_object_object_add(json_obj_order, "amount datoshi", l_amount_datoshi_str ? json_object_new_string(l_amount_datoshi_str)
+                                                                                : json_object_new_string("0"));
+            json_object_object_add(json_obj_order, "token", json_object_new_string(l_token_sell));
+            char *l_filled = dap_strdup_printf("%lu%%", l_percent_completed);
+            json_object_object_add(json_obj_order, "filled", json_object_new_string(l_filled));
+            DAP_DELETE(l_filled);
+            json_object_object_add(json_obj_order, "token buy", json_object_new_string(l_token_buy));
+            json_object_object_add(json_obj_order, "token sell", json_object_new_string(l_token_sell));
+            json_object_object_add(json_obj_order, "rate", json_object_new_string(l_cp_rate));
+            json_object_object_add(json_obj_order, "net", json_object_new_string(l_net->pub.name));
+            json_object_object_add(json_obj_order, "owner addr", json_object_new_string(l_owner_addr ? l_owner_addr : "unknown"));
+            json_object_array_add(*a_json_arr_reply, json_obj_order);
 
             DAP_DEL_Z(l_cp_rate);
             DAP_DEL_Z(l_amount_coins_str);
@@ -1821,8 +1897,9 @@ static int s_cli_srv_xchange_order(int a_argc, char **a_argv, int a_arg_index, v
         } break;
 
         default: {
-            dap_cli_server_cmd_set_reply_text(a_str_reply, "Subcommand %s not recognized", a_argv[a_arg_index]);
-            return -4;
+            dap_json_rpc_error_add(*a_json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_SUB_NOT_FOUND_ERR,
+                                                                "Subcommand %s not recognized", a_argv[a_arg_index]);
+            return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_SUB_NOT_FOUND_ERR;
         }
     }
     return 0;
@@ -2163,15 +2240,238 @@ static bool s_string_append_tx_cond_info( dap_string_t * a_reply_str,  dap_chain
     return true;
 }
 
+/**
+ * @brief Append tx info to the reply string
+ * @param a_json_out
+ * @param a_net
+ * @param a_tx
+ */
+static bool s_string_append_tx_cond_info_json( json_object * a_json_out,
+                                         dap_chain_net_t * a_net,
+                                         dap_chain_addr_t *a_owner_addr,
+                                         dap_chain_addr_t *a_buyer_addr,
+                                         dap_chain_datum_tx_t * a_tx,
+                                         tx_opt_status_t a_filter_by_status,
+                                         bool a_print_prev_hash, bool a_print_status, bool a_print_ts)
+{
+    size_t l_tx_size = dap_chain_datum_tx_get_size(a_tx);
+
+    dap_hash_fast_t l_tx_hash = {0};
+
+    dap_hash_fast(a_tx, l_tx_size, &l_tx_hash);
+    const char *l_tx_hash_str = dap_chain_hash_fast_to_str_static(&l_tx_hash);
+
+    // Get input token ticker
+    const char * l_tx_input_ticker = dap_ledger_tx_get_token_ticker_by_hash(
+                a_net->pub.ledger, &l_tx_hash);
+    if(!l_tx_input_ticker){
+        log_it(L_WARNING, "Can't get ticker from tx");
+        return false;
+    }
+    dap_chain_tx_out_cond_t *l_out_prev_cond_item = NULL;
+    dap_chain_tx_out_cond_t *l_out_cond_item = NULL;
+    int l_cond_idx = 0;
+
+    xchange_tx_type_t l_tx_type = dap_chain_net_srv_xchange_tx_get_type(a_net->pub.ledger, a_tx, &l_out_cond_item, &l_cond_idx, &l_out_prev_cond_item);
+
+    bool l_is_closed = dap_ledger_tx_hash_is_used_out_item(a_net->pub.ledger, &l_tx_hash, l_cond_idx, NULL);
+    if ((a_filter_by_status == TX_STATUS_ACTIVE && l_is_closed) || (a_filter_by_status == TX_STATUS_INACTIVE && !l_is_closed)
+     || (a_filter_by_status == TX_STATUS_ACTIVE && l_tx_type == TX_TYPE_INVALIDATE))
+        return false;
+
+    if(l_out_prev_cond_item && l_out_prev_cond_item->header.subtype != DAP_CHAIN_TX_OUT_COND_SUBTYPE_SRV_XCHANGE)
+        return false;
 
-static int s_cli_srv_xchange_tx_list_addr(dap_chain_net_t *a_net, dap_time_t a_after, dap_time_t a_before,
-                                          dap_chain_addr_t *a_addr, int a_opt_status, void **a_str_reply)
+    switch(l_tx_type){
+        case TX_TYPE_ORDER:{
+            if (!l_out_cond_item) {
+                log_it(L_ERROR, "Can't find conditional output");
+                return false;
+            }
+            char *l_rate_str = dap_chain_balance_coins_print(l_out_cond_item->subtype.srv_xchange.rate);
+            const char *l_amount_str, *l_amount_datoshi_str = dap_uint256_to_char(l_out_cond_item->header.value, &l_amount_str);
+
+            json_object_object_add(a_json_out, "hash", json_object_new_string(l_tx_hash_str));
+            if(a_print_ts){
+                char l_tmp_buf[DAP_TIME_STR_SIZE];
+                dap_time_to_str_rfc822(l_tmp_buf, DAP_TIME_STR_SIZE, a_tx->header.ts_created);
+                json_object_object_add(a_json_out, "ts_created", json_object_new_string(l_tmp_buf));
+            }
+            if( a_print_status)
+                json_object_object_add(a_json_out, "status", l_is_closed ? json_object_new_string("inactive")
+                                                                         : json_object_new_string("active"));
+            json_object_object_add(a_json_out, "proposed price", json_object_new_string(l_amount_str));
+            json_object_object_add(a_json_out, "proposed datoshi", json_object_new_string(l_amount_datoshi_str));
+            json_object_object_add(a_json_out, "ticker", json_object_new_string(l_tx_input_ticker));
+            json_object_object_add(a_json_out, "buy token", json_object_new_string(l_out_cond_item->subtype.srv_xchange.buy_token));
+            json_object_object_add(a_json_out, "rate", json_object_new_string(l_rate_str));
+            json_object_object_add(a_json_out, "net", json_object_new_string(a_net->pub.name));
+            dap_chain_addr_t l_owner_addr = {};
+            if (!a_owner_addr){
+                l_owner_addr = l_out_cond_item ? l_out_cond_item->subtype.srv_xchange.seller_addr : (l_out_prev_cond_item ? l_out_prev_cond_item->subtype.srv_xchange.seller_addr : (dap_chain_addr_t){0});
+            } else {
+                l_owner_addr = *a_owner_addr;
+            }
+            json_object_object_add(a_json_out, "nowner addr", json_object_new_string(dap_chain_addr_to_str_static(&l_owner_addr)));
+            DAP_DELETE(l_rate_str);
+        } break;
+        case TX_TYPE_EXCHANGE:{
+            dap_chain_tx_in_cond_t *l_in_cond
+                = (dap_chain_tx_in_cond_t*)dap_chain_datum_tx_item_get(a_tx, NULL, NULL, TX_ITEM_TYPE_IN_COND , NULL);
+            char l_tx_prev_cond_hash_str[DAP_CHAIN_HASH_FAST_STR_SIZE];
+            dap_hash_fast_to_str(&l_in_cond->header.tx_prev_hash, l_tx_prev_cond_hash_str, sizeof(l_tx_prev_cond_hash_str));
+
+            if (!l_out_prev_cond_item) {
+                log_it(L_ERROR, "Can't find previous transaction");
+                return false;
+            }
+
+            uint256_t l_rate = l_out_cond_item
+                ? l_out_cond_item->subtype.srv_xchange.rate
+                : l_out_prev_cond_item->subtype.srv_xchange.rate,
+                     l_value_from = {}, l_value_to = {};
+
+            if (l_out_cond_item)
+                SUBTRACT_256_256(l_out_prev_cond_item->header.value, l_out_cond_item->header.value, &l_value_from);
+            else
+                l_value_from = l_out_prev_cond_item->header.value;
+            MULT_256_COIN(l_value_from, l_rate, &l_value_to);
+
+            char *l_buy_ticker = l_out_cond_item
+                ? l_out_cond_item->subtype.srv_xchange.buy_token
+                : l_out_prev_cond_item->subtype.srv_xchange.buy_token;
+
+            json_object_object_add(a_json_out, "hash", json_object_new_string(l_tx_hash_str));
+            if(a_print_ts){
+                char l_tmp_buf[DAP_TIME_STR_SIZE];
+                dap_time_to_str_rfc822(l_tmp_buf, DAP_TIME_STR_SIZE, a_tx->header.ts_created);
+                json_object_object_add(a_json_out, "ts_created", json_object_new_string(l_tmp_buf));
+            }
+            if(a_print_status)
+                json_object_object_add(a_json_out, "status", l_is_closed ? json_object_new_string("inactive")
+                                                                         : json_object_new_string("active"));
+
+            const char *l_value_from_str, *l_value_from_datoshi_str = dap_uint256_to_char(l_value_from, &l_value_from_str);
+            json_object_object_add(a_json_out, "changed", json_object_new_string(l_value_from_str));
+            json_object_object_add(a_json_out, "changed datoshi", json_object_new_string(l_value_from_datoshi_str));
+            json_object_object_add(a_json_out, "ticker", json_object_new_string(l_tx_input_ticker));
+
+            const char *l_value_to_str, *l_value_to_datoshi_str = dap_uint256_to_char(l_value_to, &l_value_to_str);
+
+            json_object_object_add(a_json_out, "for", json_object_new_string(l_value_to_str));
+            json_object_object_add(a_json_out, "for datoshi", json_object_new_string(l_value_to_datoshi_str));
+            json_object_object_add(a_json_out, "ticker", json_object_new_string(l_buy_ticker));
+
+            const char *l_rate_str; dap_uint256_to_char(l_rate, &l_rate_str);
+            json_object_object_add(a_json_out, "rate", json_object_new_string(l_rate_str));
+
+            const char *l_amount_str = NULL,
+                 *l_amount_datoshi_str = l_out_cond_item ? dap_uint256_to_char(l_out_cond_item->header.value, &l_amount_str) : "0";
+            json_object_object_add(a_json_out, "remain amount", l_amount_str ? json_object_new_string(l_amount_str)
+                                                                             : json_object_new_string("0.0"));
+            json_object_object_add(a_json_out, "remain amount datoshi", json_object_new_string(l_amount_datoshi_str));
+            json_object_object_add(a_json_out, "ticker", json_object_new_string(l_tx_input_ticker));
+            json_object_object_add(a_json_out, "net", json_object_new_string(a_net->pub.name));
+            if (a_print_prev_hash)
+                json_object_object_add(a_json_out, "Prev cond", json_object_new_string(l_tx_prev_cond_hash_str));
+            dap_chain_tx_out_cond_subtype_t l_cond_type = l_out_cond_item ? l_out_cond_item->header.subtype : l_out_prev_cond_item->header.subtype;
+            dap_hash_fast_t l_order_hash = dap_ledger_get_first_chain_tx_hash(a_net->pub.ledger, l_cond_type, &l_tx_hash);
+            if ( dap_hash_fast_is_blank(&l_order_hash) )
+                l_order_hash = l_in_cond->header.tx_prev_hash;
+            char l_order_hash_str[DAP_CHAIN_HASH_FAST_STR_SIZE];
+            dap_hash_fast_to_str(&l_order_hash, l_order_hash_str, sizeof(l_order_hash_str));
+            json_object_object_add(a_json_out, "norder hash", json_object_new_string(l_order_hash_str));
+
+            dap_chain_addr_t l_owner_addr = {};
+            if (!a_owner_addr){
+                l_owner_addr = l_out_cond_item ? l_out_cond_item->subtype.srv_xchange.seller_addr : (l_out_prev_cond_item ? l_out_prev_cond_item->subtype.srv_xchange.seller_addr : (dap_chain_addr_t){0});
+            } else {
+                l_owner_addr = *a_owner_addr;
+            }
+            json_object_object_add(a_json_out, "owner addr", json_object_new_string(dap_chain_addr_to_str_static(&l_owner_addr)));
+
+            dap_chain_addr_t l_buyer_addr = {};
+            if(!a_buyer_addr){
+                dap_chain_tx_sig_t *l_tx_sig = (dap_chain_tx_sig_t *)dap_chain_datum_tx_item_get(a_tx, NULL, NULL, TX_ITEM_TYPE_SIG, NULL);
+                dap_sign_t *l_sign = dap_chain_datum_tx_item_sign_get_sig((dap_chain_tx_sig_t *)l_tx_sig);
+                dap_enc_key_t *l_key_buyer = dap_sign_to_enc_key(l_sign);
+                dap_chain_addr_fill_from_key(&l_buyer_addr, l_key_buyer, a_net->pub.id);
+                dap_enc_key_delete(l_key_buyer);
+            } else
+                l_buyer_addr = *a_buyer_addr;
+            json_object_object_add(a_json_out, "buyer addr", json_object_new_string(dap_chain_addr_to_str_static(&l_buyer_addr)));
+        } break;
+        case TX_TYPE_INVALIDATE:{
+            dap_chain_tx_in_cond_t * l_in_cond = (dap_chain_tx_in_cond_t *)dap_chain_datum_tx_item_get(a_tx, NULL, NULL, TX_ITEM_TYPE_IN_COND , NULL);
+            char l_tx_prev_cond_hash_str[DAP_CHAIN_HASH_FAST_STR_SIZE];
+            dap_hash_fast_to_str(&l_in_cond->header.tx_prev_hash,l_tx_prev_cond_hash_str, sizeof(l_tx_prev_cond_hash_str));
+
+            if (!l_out_prev_cond_item) {
+                log_it(L_ERROR, "Can't find previous transaction");
+                return false;
+            }
+
+            dap_chain_datum_tx_t *l_prev_tx = dap_ledger_tx_find_by_hash(a_net->pub.ledger, &l_in_cond->header.tx_prev_hash);
+            if (!l_prev_tx)
+                return false;
+
+            int l_out_num = l_in_cond->header.tx_out_prev_idx;
+            dap_chain_tx_out_cond_t *l_out_cond = dap_chain_datum_tx_out_cond_get(l_prev_tx, DAP_CHAIN_TX_OUT_COND_SUBTYPE_SRV_XCHANGE, &l_out_num);
+            if (!l_out_cond) {
+                log_it(L_ERROR, "Can't find datum tx");
+                return false;
+            }
+            dap_hash_fast_t l_order_hash = dap_ledger_get_first_chain_tx_hash(a_net->pub.ledger, DAP_CHAIN_TX_OUT_COND_SUBTYPE_SRV_XCHANGE, &l_in_cond->header.tx_prev_hash);
+            if ( dap_hash_fast_is_blank(&l_order_hash) )
+                l_order_hash = l_in_cond->header.tx_prev_hash;
+
+            char *l_value_from_str = dap_chain_balance_coins_print(l_out_prev_cond_item->header.value);
+            char *l_value_from_datoshi_str = dap_chain_balance_datoshi_print(l_out_prev_cond_item->header.value);
+
+            json_object_object_add(a_json_out, "hash", json_object_new_string(l_tx_hash_str));
+            if(a_print_ts){
+                char l_tmp_buf[DAP_TIME_STR_SIZE];
+                dap_time_to_str_rfc822(l_tmp_buf, DAP_TIME_STR_SIZE, a_tx->header.ts_created);
+                json_object_object_add(a_json_out, "ts_created", json_object_new_string(l_tmp_buf));
+            }
+            if (a_print_status)
+                json_object_object_add(a_json_out, "status", json_object_new_string("inactive"));
+
+            char l_order_hash_str[DAP_CHAIN_HASH_FAST_STR_SIZE];
+            dap_hash_fast_to_str(&l_order_hash, l_order_hash_str, sizeof(l_order_hash_str));
+            json_object_object_add(a_json_out, "returned from", json_object_new_string(l_value_from_str));
+            json_object_object_add(a_json_out, "returned datoshi", json_object_new_string(l_value_from_datoshi_str));
+            json_object_object_add(a_json_out, "ticker", json_object_new_string(l_tx_input_ticker));
+            json_object_object_add(a_json_out, "order hash", json_object_new_string(l_order_hash_str));
+            if(a_print_prev_hash)
+                json_object_object_add(a_json_out, "prev cond hash", json_object_new_string(l_tx_prev_cond_hash_str));
+
+            dap_chain_addr_t l_owner_addr = {};
+            if (!a_owner_addr){
+                l_owner_addr = l_out_cond_item ? l_out_cond_item->subtype.srv_xchange.seller_addr : (l_out_prev_cond_item ? l_out_prev_cond_item->subtype.srv_xchange.seller_addr : (dap_chain_addr_t){0});
+            } else {
+                l_owner_addr = *a_owner_addr;
+            }
+            json_object_object_add(a_json_out, "owner addr", json_object_new_string(dap_chain_addr_to_str_static(&l_owner_addr)));
+
+            DAP_DELETE(l_value_from_str);
+            DAP_DELETE(l_value_from_datoshi_str);
+        } break;
+        default: return false;
+    }
+    return true;
+}
+
+
+
+static int s_cli_srv_xchange_tx_list_addr_json(dap_chain_net_t *a_net, dap_time_t a_after, dap_time_t a_before,
+                                          dap_chain_addr_t *a_addr, int a_opt_status, json_object* json_obj_out)
 {
-    dap_string_t *l_reply_str;
+    dap_chain_hash_fast_t l_tx_first_hash = {0};
     size_t l_tx_total;
 
-    if ( !(l_reply_str = dap_string_new("")) )
-        return  log_it(L_CRITICAL, "%s", c_error_memory_alloc), -ENOMEM;
+    memset(&l_tx_first_hash, 0, sizeof(dap_chain_hash_fast_t));             /* Initial hash == zero */
+    json_object* json_arr_datum_out = json_object_new_array();
 
     size_t l_tx_count = 0;
     dap_hash_fast_t l_hash_curr = {};
@@ -2191,8 +2491,11 @@ static int s_cli_srv_xchange_tx_list_addr(dap_chain_net_t *a_net, dap_time_t a_a
             if ( a_before && (l_datum_tx->header.ts_created > a_before) )
                     continue;
 
-            if (s_string_append_tx_cond_info(l_reply_str, a_net, NULL, NULL, l_datum_tx, &l_hash_curr, a_opt_status, false, true, true))
+            json_object* json_obj_tx = json_object_new_object();
+            if (s_string_append_tx_cond_info_json(json_obj_tx, a_net, NULL, NULL, l_datum_tx, a_opt_status, false, true, false)) {
+                json_object_array_add(json_arr_datum_out, json_obj_tx);
                 l_tx_count++;
+            }
         }
     } else {
         int l_ret_code = 0;
@@ -2213,14 +2516,19 @@ static int s_cli_srv_xchange_tx_list_addr(dap_chain_net_t *a_net, dap_time_t a_a
             if ( a_before && (l_datum_tx->header.ts_created > a_before) )
                 continue;
 
-            if (s_string_append_tx_cond_info(l_reply_str, a_net, NULL, NULL, l_datum_tx, &l_hash_curr, a_opt_status, false, true, true))
+            json_object* json_obj_tx = json_object_new_object();
+            if (s_string_append_tx_cond_info_json(json_obj_tx, a_net, NULL, NULL, l_datum_tx, a_opt_status, false, true, false)) {
+                json_object_array_add(json_arr_datum_out, json_obj_tx);
                 l_tx_count++;
+            }
         }
         dap_chain_wallet_cache_iter_delete(l_iter);
     }
 
-    dap_string_append_printf(l_reply_str, "\nFound %"DAP_UINT64_FORMAT_U" transactions", l_tx_count);
-    *a_str_reply = dap_string_free(l_reply_str, false);                     /* Free string descriptor, but keep ASCIZ buffer itself */
+    json_object_object_add(json_obj_out, "transactions", json_arr_datum_out);
+    char *l_transactions = dap_strdup_printf("\nFound %"DAP_UINT64_FORMAT_U" transactions", l_tx_count);
+    json_object_object_add(json_obj_out, "number of transactions", json_object_new_string(l_transactions));
+    DAP_DELETE(l_transactions);                    /* Free string descriptor, but keep ASCIZ buffer itself */
     return  0;
 }
 
@@ -2239,6 +2547,8 @@ void s_tx_is_order_check(UNUSED_ARG dap_chain_net_t* a_net, dap_chain_datum_tx_t
 
 static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
 {
+    json_object **json_arr_reply = (json_object **)a_str_reply;
+
     enum {CMD_NONE = 0, CMD_ORDER, CMD_ORDERS, CMD_PURCHASE, CMD_TX_LIST, CMD_TOKEN_PAIR };
     int l_arg_index = 1, l_cmd_num = CMD_NONE;
 
@@ -2260,23 +2570,24 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
 
 
     switch (l_cmd_num) {
-        case CMD_ORDER:
-            return s_cli_srv_xchange_order(a_argc, a_argv, l_arg_index + 1, a_str_reply);
+        case CMD_ORDER:{
+            int res = s_cli_srv_xchange_order(a_argc, a_argv, l_arg_index + 1, json_arr_reply);
+            return res;
+        }
         case CMD_ORDERS: {
             const char *l_net_str = NULL;
             const char *l_status_str = NULL;
             l_arg_index++;
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-net", &l_net_str);
             if (!l_net_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'orders' requires parameter -net");
-                return -2;
+                dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_REQ_PARAM_NET_ERR, "Command 'orders' requires parameter -net");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_REQ_PARAM_NET_ERR;
             }
             dap_chain_net_t *l_net = dap_chain_net_by_name(l_net_str);
             if (!l_net) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Network %s not found", l_net_str);
-                return -3;
+                dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_NET_NOT_FOUND_ERR, "Network %s not found", l_net_str);
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_NET_NOT_FOUND_ERR;
             }
-            dap_string_t *l_reply_str = dap_string_new("");
             dap_list_t *l_list = NULL;
             if (s_xchange_cache_state == XCHANGE_CACHE_ENABLED){
                 xchange_orders_cache_net_t* l_cache = NULL;
@@ -2309,8 +2620,8 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
                 else if ( dap_strcmp (l_status_str, "all") == 0 )
                     l_opt_status = 0;
                 else  {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Unrecognized '-status %s'", l_status_str);
-                    return -3;
+                    dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_UNREC_STATUS_ERR, "Unrecognized '-status %s'", l_status_str);
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_UNREC_STATUS_ERR;
                 }
             }
 
@@ -2320,8 +2631,9 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
             if(l_token_from_str){
                 dap_chain_datum_token_t * l_token_from_datum = dap_ledger_token_ticker_check( l_net->pub.ledger, l_token_from_str);
                 if(!l_token_from_datum){
-                    dap_cli_server_cmd_set_reply_text(a_str_reply,"Can't find \"%s\" token in network \"%s\" for argument '-token_from' ", l_token_from_str, l_net->pub.name);
-                    return -6;
+                    dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CANT_FIND_TOKEN_FROM_ERR,
+                                            "Can't find \"%s\" token in network \"%s\" for argument '-token_from' ", l_token_from_str, l_net->pub.name);
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CANT_FIND_TOKEN_FROM_ERR;
                 }
             }
 
@@ -2335,8 +2647,9 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
             if(l_token_to_str){
                 dap_chain_datum_token_t * l_token_to_datum = dap_ledger_token_ticker_check( l_net->pub.ledger, l_token_to_str);
                 if(!l_token_to_datum){
-                    dap_cli_server_cmd_set_reply_text(a_str_reply,"Can't find \"%s\" token in network \"%s\" for argument '-token_to' ", l_token_to_str, l_net->pub.name);
-                    return -6;
+                    dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CANT_FIND_TOKEN_TO_ERR,
+                                            "Can't find \"%s\" token in network \"%s\" for argument '-token_to' ", l_token_to_str, l_net->pub.name);
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CANT_FIND_TOKEN_TO_ERR;
                 }
             }
 
@@ -2349,18 +2662,9 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
             size_t l_offset = l_offset_str ? strtoul(l_offset_str, NULL, 10) : 0;
             size_t l_arr_start = 0;            
             size_t l_arr_end = dap_list_length(l_list);
-            size_t l_total_orders = l_arr_end;
-            if (l_offset > 0) {
-                l_arr_start = l_offset;
-                dap_string_append_printf(l_reply_str, "offset: %lu\n", l_arr_start);                
-            }
-            if (l_limit) {
-                dap_string_append_printf(l_reply_str, "limit: %lu\n", l_limit);
-                l_arr_end = l_arr_start + l_limit;
-                if (l_arr_end > dap_list_length(l_list)) {
-                    l_arr_end = dap_list_length(l_list);
-                }
-            }            
+            json_object* json_obj_order = json_object_new_object();
+            json_object* json_arr_orders_out = json_object_new_array();
+            dap_chain_set_offset_limit_json(json_arr_orders_out, &l_arr_start, &l_arr_end, l_limit, l_offset, dap_list_length(l_list));
             size_t i_tmp = 0;
             // Print all txs
             for (dap_list_t *it = l_list; it; it = it->next) {
@@ -2487,19 +2791,25 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
                 l_amount_coins_str = dap_uint256_decimal_to_char(l_amount);
                 l_proposed_coins_str = dap_uint256_decimal_to_char(l_proposed); 
                 l_proposed_datoshi_str = dap_uint256_uninteger_to_char(l_proposed);
-                
-                dap_string_append_printf(l_reply_str, "orderHash: %s\n ts_created: %s\n Status: %s, proposed: %s(%s) %s, amount: %s (%s) %s, filled: %lu%%, rate (%s/%s): %s, net: %s\n\n"
-                                         "owner addr: %s\n\n", l_tx_hash_str,
-                                         l_tmp_buf, l_status_order_str,
-                                         l_proposed_coins_str ? l_proposed_coins_str : "0.0",
-                                         l_proposed_datoshi_str ? l_proposed_datoshi_str : "0",
-                                         l_sell_token, 
-                                         l_amount_coins_str ? l_amount_coins_str : "0.0",
-                                         l_amount_datoshi_str ? l_amount_datoshi_str : "0",
-                                         l_sell_token, l_percent_completed,
-                                         l_buy_token, l_sell_token,
-                                         l_cp_rate,
-                                         l_net->pub.name, l_owner_addr ? l_owner_addr : "unknown");
+
+                json_object* json_obj_orders = json_object_new_object();
+                json_object_object_add(json_obj_orders, "orderHash", json_object_new_string(l_tx_hash_str));
+                json_object_object_add(json_obj_orders, "ts_created", json_object_new_string(l_tmp_buf));
+                json_object_object_add(json_obj_orders, "status", json_object_new_string(l_status_order_str));
+                json_object_object_add(json_obj_orders, "amount coins", l_amount_coins_str ?
+                                                json_object_new_string(l_amount_coins_str) :
+                                                json_object_new_string("0.0"));
+                json_object_object_add(json_obj_orders, "amount datoshi", l_amount_datoshi_str ?
+                                                json_object_new_string(l_amount_datoshi_str) :
+                                                json_object_new_string("0"));
+                json_object_object_add(json_obj_orders, "token sell", json_object_new_string(l_sell_token));
+                json_object_object_add(json_obj_orders, "filled", json_object_new_uint64(l_percent_completed));
+                json_object_object_add(json_obj_orders, "token buy", json_object_new_string(l_buy_token));
+                json_object_object_add(json_obj_orders, "token sell", json_object_new_string(l_sell_token));
+                json_object_object_add(json_obj_orders, "balance rate", json_object_new_string(l_cp_rate));
+                json_object_object_add(json_obj_orders, "net name", json_object_new_string(l_net->pub.name));
+                json_object_object_add(json_obj_orders, "owner addr", json_object_new_string(l_owner_addr ? l_owner_addr : "unknown"));
+                json_object_array_add(json_arr_orders_out, json_obj_orders);
                 l_printed_orders_count++;
                 DAP_DEL_Z(l_cp_rate);
                 DAP_DEL_Z(l_amount_datoshi_str);
@@ -2507,16 +2817,20 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
                 DAP_DEL_Z(l_proposed_coins_str);
                 DAP_DEL_Z(l_proposed_datoshi_str);
             }
+            json_object_object_add(json_obj_order, "ORDERS", json_arr_orders_out);
+            json_object_array_add(*json_arr_reply, json_obj_order);
             if (s_xchange_cache_state == XCHANGE_CACHE_ENABLED){
                 dap_list_free(l_list);
             } else {
                 dap_list_free_full(l_list, NULL);
             }
-            dap_string_append_printf(l_reply_str, "Total %"DAP_UINT64_FORMAT_U" orders.\n\r", i_tmp);
-            if (!l_reply_str->len) {
-                dap_string_append(l_reply_str, "No orders found");
+            char *l_total = dap_strdup_printf("Total %"DAP_UINT64_FORMAT_U" orders.\n\r", i_tmp);
+            json_object_object_add(json_obj_order, "number of transactions", json_object_new_string(l_total));
+            DAP_DELETE(l_total);
+
+            if (!json_object_array_length(json_arr_orders_out)) {
+                dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_UNREC_STATUS_ERR, "No orders found");
             }
-            *a_str_reply = dap_string_free(l_reply_str, false);
         } break;
 
 
@@ -2525,39 +2839,42 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
             l_arg_index++;
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-net", &l_net_str);
             if (!l_net_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'purchase' requires parameter -net");
-                return -2;
+                dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_REQ_PARAM_NET_ERR, "Command 'purchase' requires parameter -net");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_REQ_PARAM_NET_ERR;
             }
             dap_chain_net_t *l_net = dap_chain_net_by_name(l_net_str);
             if (!l_net) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Network %s not found", l_net_str);
-                return -3;
+                dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_NET_NOT_FOUND_ERR, "Network %s not found", l_net_str);
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_NET_NOT_FOUND_ERR;
             }
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-w", &l_wallet_str);
             if (!l_wallet_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'purchase' requires parameter -w");
-                return -10;
+                dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_REQ_PARAM_W_ERR, "Command 'purchase' requires parameter -w");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_REQ_PARAM_W_ERR;
             }
             dap_chain_wallet_t *l_wallet = dap_chain_wallet_open(l_wallet_str, dap_chain_wallet_get_path(g_config), NULL);
             if (!l_wallet) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Specified wallet not found");
-                return -11;
+                dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_WALLET_NOT_FOUND_ERR, "Specified wallet not found");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_WALLET_NOT_FOUND_ERR;
             }
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-order", &l_order_hash_str);
             if (!l_order_hash_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'purchase' requires parameter -order");
-                return -12;
+                dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_REQ_PARAM_ORDER_ERR,
+                                            "Command 'purchase' requires parameter -order");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_REQ_PARAM_ORDER_ERR;
             }
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-value", &l_val_buy_str);
             if (!l_val_buy_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'purchase' requires parameter -value");
-                return -8;
+                dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_REQ_PARAM_VALUE_ERR,
+                                            "Command 'purchase' requires parameter -value");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_REQ_PARAM_VALUE_ERR;
             }
             uint256_t l_datoshi_buy = dap_chain_balance_scan(l_val_buy_str);
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-fee", &l_val_fee_str);
             if (!l_val_fee_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'purchase' requires parameter -fee");
-                return  -8;
+                dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_REQ_PARAM_FEE_ERR,
+                                            "Command 'purchase' requires parameter -fee");
+                return  -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_REQ_PARAM_FEE_ERR;
             }
             uint256_t  l_datoshi_fee = dap_chain_balance_scan(l_val_fee_str);
             dap_hash_fast_t l_tx_hash = {};
@@ -2567,25 +2884,29 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
                                                                 l_wallet, &l_str_ret_hash);
             switch (l_ret_code) {
                 case XCHANGE_PURCHASE_ERROR_OK: {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Exchange transaction has done. tx hash: %s", l_str_ret_hash);
+                    json_object* json_obj_orders = json_object_new_object();
+                    json_object_object_add(json_obj_orders, "status", json_object_new_string("Exchange transaction has done"));
+                    json_object_object_add(json_obj_orders, "hash", json_object_new_string(l_str_ret_hash));
+                    json_object_array_add(*json_arr_reply, json_obj_orders);
                     DAP_DELETE(l_str_ret_hash);
                     return 0;
                 }
                 case XCHANGE_PURCHASE_ERROR_SPECIFIED_ORDER_NOT_FOUND: {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Specified order not found");
-                    return -13;
+                    dap_json_rpc_error_add(*json_arr_reply, XCHANGE_PURCHASE_ERROR_SPECIFIED_ORDER_NOT_FOUND,"Specified order not found");
+                    return -XCHANGE_PURCHASE_ERROR_SPECIFIED_ORDER_NOT_FOUND;
                 }
                 case XCHANGE_PURCHASE_ERROR_CAN_NOT_CREATE_PRICE: {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Can't create price from order");
-                    return -13;
+                    dap_json_rpc_error_add(*json_arr_reply, XCHANGE_PURCHASE_ERROR_CAN_NOT_CREATE_PRICE, "Can't create price from order");
+                    return -XCHANGE_PURCHASE_ERROR_CAN_NOT_CREATE_PRICE;
                 }
                 case XCHANGE_PURCHASE_ERROR_CAN_NOT_CREATE_EXCHANGE_TX: {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply,  "Exchange transaction error");
-                    return -13;
+                    dap_json_rpc_error_add(*json_arr_reply, XCHANGE_PURCHASE_ERROR_CAN_NOT_CREATE_EXCHANGE_TX, "Exchange transaction error");
+                    return -XCHANGE_PURCHASE_ERROR_CAN_NOT_CREATE_EXCHANGE_TX;
                 }
                 default: {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "An error occurred with an unknown code: %d.", l_ret_code);
-                    return -14;
+                    dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_UNKNOWN_ERR,
+                                                            "An error occurred with an unknown code: %d.", l_ret_code);
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_UNKNOWN_ERR;
                 }
             }
         } break;
@@ -2622,20 +2943,22 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
                 else if ( dap_strcmp (l_status_str, "all") == 0 )
                     l_opt_status = TX_STATUS_ALL;
                 else  {
-
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Unrecognized '-status %s'", l_status_str);
-                    return -3;
+                    dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_LIST_UNREC_STATUS_ERR,
+                                                                "Unrecognized '-status %s'", l_status_str);
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_LIST_UNREC_STATUS_ERR;
                 }
             }
 
             if(!l_net_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'tx_list' requires parameter -net");
-                return -3;
+                dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_LIST_REQ_PARAM_NET_ERR,
+                                                                "Command 'tx_list' requires parameter -net");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_LIST_REQ_PARAM_NET_ERR;
             }
             dap_chain_net_t *l_net = dap_chain_net_by_name(l_net_str);
             if(!l_net) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Network %s not found", l_net_str);
-                return -4;
+                dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_LIST_NET_NOT_FOUND_ERR,
+                                                                "Network %s not found", l_net_str);
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_LIST_NET_NOT_FOUND_ERR;
             }
 
             dap_time_t l_time[2];
@@ -2645,19 +2968,22 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
             /* Dispatch request processing to ... */
             if ( l_addr_str )
             {
-                if ( !(l_addr = dap_chain_addr_from_str(l_addr_str)) )
-                    return  dap_cli_server_cmd_set_reply_text(a_str_reply, "Cannot convert -addr '%s' to internal representative", l_addr_str), -EINVAL;
-
-                return  s_cli_srv_xchange_tx_list_addr (l_net, l_time[0], l_time[1], l_addr, l_opt_status, a_str_reply);
+                if ( !(l_addr = dap_chain_addr_from_str(l_addr_str)) ) {
+                    dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_LIST_CAN_NOT_CONVERT_ERR,
+                                           "Cannot convert -addr '%s' to internal representative", l_addr_str);
+                    return -EINVAL;
+                }
+                json_object* json_obj_order = json_object_new_object();
+                s_cli_srv_xchange_tx_list_addr_json(l_net, l_time[0], l_time[1], l_addr, l_opt_status, json_obj_order);
+                json_object_array_add(*json_arr_reply, json_obj_order);
+                return 0;
             }
 
-            // Prepare output string
-            dap_string_t *l_reply_str = dap_string_new("");
-
             // Find transactions using filter function s_filter_tx_list()
             if (s_xchange_cache_state == XCHANGE_CACHE_ENABLED){
                 xchange_orders_cache_net_t* l_cache = NULL;
                 dap_list_t *l_tx_cache_list = NULL;
+                json_object* json_arr_bl_out = json_object_new_array();
                 l_cache = s_get_xchange_cache_by_net_id(l_net->pub.id);
                 xchange_tx_cache_t* l_temp, *l_item;
                 HASH_ITER(hh, l_cache->cache, l_item, l_temp){
@@ -2666,16 +2992,21 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
 
                     if (l_time[1] && l_item->tx->header.ts_created > l_time[1])
                         break;
-
-                    if (s_string_append_tx_cond_info(l_reply_str, l_net,  &l_item->seller_addr, 
+                    json_object* json_obj_order = json_object_new_object();
+                    if (s_string_append_tx_cond_info_json(json_obj_order, l_net, &l_item->seller_addr,
                                 l_item->tx_type == TX_TYPE_EXCHANGE ?  &l_item->tx_info.exchange_info.buyer_addr : NULL,
-                                l_item->tx, &l_item->hash, l_opt_status, false, true, true))
+                                l_item->tx, l_opt_status, false, true, true)) {
+                        json_object_array_add(json_arr_bl_out, json_obj_order);
                         l_show_tx_nr++;
+                    }
                 }
+                json_object* json_obj_xchange = json_object_new_object();
+                json_object_object_add(json_obj_xchange, "orders", json_arr_bl_out);
+                json_object_array_add(*json_arr_reply, json_obj_xchange);
             } else {
                 dap_list_t *l_datum_list0 = dap_chain_datum_list(l_net, NULL, s_filter_tx_list, l_time);
                 size_t l_datum_num = dap_list_length(l_datum_list0);
-
+                json_object* json_arr_bl_out = json_object_new_array();
                 if (l_datum_num > 0) {
                     dap_list_t *l_datum_list = l_datum_list0;
                     while(l_datum_list) {
@@ -2685,23 +3016,28 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
 
                         if (l_time[1] && l_datum_tx->header.ts_created > l_time[1])
                             break;
-
+                        json_object* json_obj_order = json_object_new_object();
                         dap_hash_fast_t l_hash = {};
                         dap_hash_fast(l_datum_tx, dap_chain_datum_tx_get_size(l_datum_tx), &l_hash);
-                        if (s_string_append_tx_cond_info(l_reply_str, l_net, NULL, NULL, l_datum_tx, &l_hash, l_opt_status, false, true, true))
+                        if (s_string_append_tx_cond_info_json(json_obj_order, l_net, NULL, NULL, l_datum_tx, l_opt_status, false, true, true)) {
+                            json_object_array_add(json_arr_bl_out, json_obj_order);
                             l_show_tx_nr++;
+                        }
                         l_datum_list = dap_list_next(l_datum_list);
-                    } 
+                    }
+                    json_object* json_obj_xchange = json_object_new_object();
+                    json_object_object_add(json_obj_xchange, "orders", json_arr_bl_out);
+                    json_object_array_add(*json_arr_reply, json_obj_xchange);
                 }
                 dap_list_free_full(l_datum_list0, NULL);
             }
+            json_object* json_obj_orders = json_object_new_object();
 
             if(l_show_tx_nr)
-                dap_string_append_printf(l_reply_str, "Found %d transactions", l_show_tx_nr);
+                json_object_object_add(json_obj_orders, "number of transactions", json_object_new_int(l_show_tx_nr));
             else 
-                dap_string_append(l_reply_str, "Transactions not found");
-
-            *a_str_reply = dap_string_free(l_reply_str, false);
+                json_object_object_add(json_obj_orders, "number of transactions", json_object_new_string("Transactions not found"));
+            json_object_array_add(*json_arr_reply, json_obj_orders);
         } break;
         // Token pair control
         case CMD_TOKEN_PAIR: {
@@ -2710,13 +3046,15 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
             const char *l_net_str = NULL;
             dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-net", &l_net_str);
             if(!l_net_str) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Command 'token_pair' requires parameter -net");
-                return -3;
+                dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_REQ_PARAM_NET_ERR,
+                                       "Command 'token_pair' requires parameter -net");
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_REQ_PARAM_NET_ERR;
             }
             dap_chain_net_t *l_net = dap_chain_net_by_name(l_net_str);
             if(!l_net) {
-                dap_cli_server_cmd_set_reply_text(a_str_reply, "Network %s not found", l_net_str);
-                return -4;
+                dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_NET_NOT_FOUND_ERR,
+                                       "Network %s not found", l_net_str);
+                return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_NET_NOT_FOUND_ERR;
             }
 
             // Select subcommands
@@ -2729,26 +3067,30 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
                 const char * l_token_from_str = NULL;
                 dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-token_from", &l_token_from_str);
                 if(!l_token_from_str){
-                    dap_cli_server_cmd_set_reply_text(a_str_reply,"No argument '-token_from'");
-                    return -5;
+                    dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_TOKEN_FROM_ARG_ERR,
+                                           "No argument '-token_from'");
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_TOKEN_FROM_ARG_ERR;
                 }
                 dap_chain_datum_token_t * l_token_from_datum = dap_ledger_token_ticker_check( l_net->pub.ledger, l_token_from_str);
                 if(!l_token_from_datum){
-                    dap_cli_server_cmd_set_reply_text(a_str_reply,"Can't find \"%s\" token in network \"%s\" for argument '-token_from' ", l_token_from_str, l_net->pub.name);
-                    return -6;
+                    dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_TOKEN_FROM_ERR,
+                                           "Can't find \"%s\" token in network \"%s\" for argument '-token_from' ", l_token_from_str, l_net->pub.name);
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_TOKEN_FROM_ERR;
                 }
 
                 // Check for token_to
                 const char * l_token_to_str = NULL;
                 dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-token_to", &l_token_to_str);
                 if(!l_token_to_str){
-                    dap_cli_server_cmd_set_reply_text(a_str_reply,"No argument '-token_to'");
-                    return -5;
+                    dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_TOKEN_TO_ERR,
+                                           "No argument '-token_to'");
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_TOKEN_TO_ERR;
                 }
                 dap_chain_datum_token_t * l_token_to_datum = dap_ledger_token_ticker_check( l_net->pub.ledger, l_token_to_str);
                 if(!l_token_to_datum){
-                    dap_cli_server_cmd_set_reply_text(a_str_reply,"Can't find \"%s\" token in network \"%s\" for argument '-token_to' ", l_token_to_str, l_net->pub.name);
-                    return -6;
+                    dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_CANT_FIND_TOKEN_ERR,
+                                           "Can't find \"%s\" token in network \"%s\" for argument '-token_to' ", l_token_to_str, l_net->pub.name);
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_CANT_FIND_TOKEN_ERR;
                 }
 
                 // Read time_from
@@ -2765,7 +3107,6 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
 
                 // Check for price subcommand
                 if (strcmp(l_price_subcommand,"average") == 0){
-                    dap_string_t *l_reply_str = dap_string_new("");
 
                     dap_list_t *l_list = NULL;
                     if (s_xchange_cache_state == XCHANGE_CACHE_ENABLED){
@@ -2850,7 +3191,8 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
                     dap_list_free(l_list);
 
                     if (IS_ZERO_256(l_total_rates) || IS_ZERO_256(l_rate) || !l_last_rate_time){
-                        dap_string_append_printf(l_reply_str,"Can't find orders for specified token pair\n");
+                        dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_CANT_FIND_ORDER_ERR,
+                                       "Can't find orders for specified token pair\n");
                     } else {
                         uint256_t l_rate_average = {0};
                         if (!IS_ZERO_256(l_total_rates_count))
@@ -2859,12 +3201,13 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
                         char l_tmp_buf[DAP_TIME_STR_SIZE];
                         dap_time_to_str_rfc822(l_tmp_buf, DAP_TIME_STR_SIZE, l_last_rate_time);
                         const char *l_rate_average_str; dap_uint256_to_char(l_rate_average, &l_rate_average_str);
-                        dap_string_append_printf(l_reply_str,"Average rate: %s\n", l_rate_average_str);
+                        json_object* json_obj_order = json_object_new_object();
+                        json_object_object_add(json_obj_order, "Average rate", json_object_new_string(l_rate_average_str));
                         const char *l_last_rate_str; dap_uint256_to_char(l_rate, &l_last_rate_str);
-                        dap_string_append_printf(l_reply_str, "Last rate: %s Last rate time: %s",
-                                                l_last_rate_str, l_tmp_buf);
+                        json_object_object_add(json_obj_order, "Last rate", json_object_new_string(l_last_rate_str));
+                        json_object_object_add(json_obj_order, "Last rate time", json_object_new_string(l_tmp_buf));
+                        json_object_array_add(*json_arr_reply, json_obj_order);
                     }
-                    *a_str_reply = dap_string_free(l_reply_str, false);
                     break;
                 }else if (strcmp(l_price_subcommand,"history") == 0){
                     const char *l_limit_str = NULL, *l_offset_str = NULL;
@@ -2875,7 +3218,6 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
 
                     uint256_t l_token_from_value = {}, l_token_to_value = {};
 
-                    dap_string_t *l_reply_str = dap_string_new("");
                     dap_list_t *l_list = NULL;
                     dap_time_t l_time[2];
                     l_time[0] = l_time_from;
@@ -2902,16 +3244,15 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
                     }
 
                     size_t l_datum_num = dap_list_length(l_list);
-                    size_t l_arr_start = 0;
-                    size_t l_arr_end  = l_datum_num;
-                    if (l_offset > 0) {
-                        l_arr_start = l_offset;
-                        dap_string_append_printf(l_reply_str, "offset: %lu\n", l_arr_start);
-                    }
-                    if (l_limit) {
-                        l_arr_end = l_arr_start + l_limit;
-                        dap_string_append_printf(l_reply_str, "limit: %lu\n", l_limit);
+                    if (l_datum_num == 0){
+                        dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_CANT_FIND_TX_ERR,
+                                           "Can't find transactions");
+                        return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_CANT_FIND_TX_ERR;
                     }
+                    json_object* json_arr_bl_cache_out = json_object_new_array();
+                    size_t l_arr_start = 0;
+                    size_t l_arr_end  = 0;
+                    dap_chain_set_offset_limit_json(json_arr_bl_cache_out, &l_arr_start, &l_arr_end, l_limit, l_offset, l_datum_num);
                     size_t i_tmp = 0;
 
                     size_t l_total = 0;
@@ -2982,19 +3323,25 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
                         if (i_tmp >= l_arr_end)
                             break;
 
-                        i_tmp++; 
+                        i_tmp++;
 
-                        if(s_string_append_tx_cond_info(l_reply_str, l_net, NULL, NULL, l_tx, &l_tx_hash, TX_STATUS_ALL, false, false, true)){
+                        json_object* json_obj_out = json_object_new_object();
+                        if(s_string_append_tx_cond_info_json(json_obj_out, l_net, NULL, NULL, l_tx, TX_STATUS_ALL, false, false, true)){
                             l_total++;
                             SUM_256_256(l_token_to_value, l_token_curr_to_value, &l_token_to_value);
                             SUM_256_256(l_token_from_value, l_token_curr_from_value, &l_token_from_value);
+                            json_object_array_add(json_arr_bl_cache_out, json_obj_out);
                         }
 
                         l_cur = dap_list_next(l_cur);
                     }
+                    json_object_array_add(*json_arr_reply, json_arr_bl_cache_out);
 
                     dap_list_free(l_list);
-                    dap_string_append_printf(l_reply_str, "Found %"DAP_UINT64_FORMAT_U" transactions\n", l_total);   
+                    json_object* json_obj_order = json_object_new_object();
+                    char *l_total_str = dap_strdup_printf("Found %"DAP_UINT64_FORMAT_U" transactions\n", l_total);
+                    json_object_object_add(json_obj_order, "number of transactions", json_object_new_string(l_total_str));
+                    DAP_DELETE(l_total_str);
 
                     const char *l_token_from_value_coins_str = NULL, *l_token_from_value_datoshi_str = NULL,
                                 *l_token_to_value_coins_str = NULL, *l_token_to_value_datoshi_str = NULL;
@@ -3004,21 +3351,26 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
                     l_token_to_value_datoshi_str = dap_chain_balance_datoshi_print(l_token_to_value);
                     l_token_to_value_coins_str = dap_chain_balance_coins_print(l_token_to_value);
 
-                    dap_string_append_printf(l_reply_str, "Traiding value:\n\t%s (%s) %s\n\t%s (%s) %s\n", l_token_from_value_coins_str, l_token_from_value_datoshi_str, l_token_from_str,
-                                                                                                    l_token_to_value_coins_str, l_token_to_value_datoshi_str, l_token_to_str);
+                    json_object_object_add(json_obj_order, "trading from coins", json_object_new_string(l_token_from_value_coins_str));
+                    json_object_object_add(json_obj_order, "trading from datoshi", json_object_new_string(l_token_from_value_datoshi_str));
+                    json_object_object_add(json_obj_order, "trading from token", json_object_new_string(l_token_from_str));
+
+                    json_object_object_add(json_obj_order, "trading to coins", json_object_new_string(l_token_to_value_coins_str));
+                    json_object_object_add(json_obj_order, "trading to datoshi", json_object_new_string(l_token_to_value_datoshi_str));
+                    json_object_object_add(json_obj_order, "trading to token", json_object_new_string(l_token_to_str));
 
                     DAP_DEL_Z(l_token_from_value_datoshi_str);
                     DAP_DEL_Z(l_token_from_value_coins_str);
                     DAP_DEL_Z(l_token_to_value_datoshi_str);
                     DAP_DEL_Z(l_token_to_value_coins_str);
                 
-                    *a_str_reply = dap_string_free(l_reply_str, false);
+                    json_object_array_add(*json_arr_reply, json_obj_order);
                     break;
 
                 } else {
-                    dap_cli_server_cmd_set_reply_text(a_str_reply, "Unrecognized subcommand '%s'",
-                                                      l_price_subcommand);
-                    return -38;
+                    dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_UNKNOWN_ERR,
+                                           "Unrecognized subcommand '%s'", l_price_subcommand);
+                    return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_UNKNOWN_ERR;
                 }
             }
 
@@ -3031,18 +3383,16 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
                     dap_cli_server_cmd_find_option_val(a_argv, l_arg_index, a_argc, "-offset", &l_offset_str);
                     size_t l_offset = l_offset_str ? strtoul(l_offset_str, NULL, 10) : 0;
                     size_t l_limit  = l_limit_str ? strtoul(l_limit_str, NULL, 10) : 0;
-                    dap_string_t *l_reply_str = dap_string_new("");
                     char ** l_tickers = NULL;
                     size_t l_tickers_count = 0;
                     dap_ledger_addr_get_token_ticker_all( l_net->pub.ledger,NULL,&l_tickers,&l_tickers_count);
-
+                    json_object* json_obj_out = json_object_new_object();
                     size_t l_pairs_count = 0;
                     if(l_tickers){
-                        size_t l_arr_start = l_offset;
+                        size_t l_arr_start = 0;
                         size_t l_arr_end  = 0;
-                        if (l_limit) {
-                            l_arr_end = l_arr_start + l_limit - 1;
-                        }
+                        json_object* json_arr_bl_cache_out = json_object_new_array();
+                        dap_chain_set_offset_limit_json(json_arr_bl_cache_out, &l_arr_start, &l_arr_end, l_limit, l_offset, l_tickers_count);
                         size_t i_tmp = 0;
                         for(size_t i = 0; i< l_tickers_count; i++){
                             for(size_t j = i+1; j< l_tickers_count; j++){
@@ -3053,12 +3403,16 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
                                         continue;
                                     }
                                     i_tmp++;
-                                    dap_string_append_printf(l_reply_str,"%s:%s ", l_tickers[i], l_tickers[j]);
+                                    json_object* json_obj_bl = json_object_new_object();
+                                    json_object_object_add(json_obj_bl, "ticker_1",json_object_new_string(l_tickers[i]));
+                                    json_object_object_add(json_obj_bl, "ticker_2",json_object_new_string(l_tickers[j]));
+                                    json_object_array_add(json_arr_bl_cache_out, json_obj_bl);
                                     l_pairs_count++;
                                 }
                             }
 
                         }
+                        json_object_object_add(json_obj_out, "TICKERS PAIR", json_arr_bl_cache_out);
 
                         // Free tickers array
                         for(size_t i = 0; i< l_tickers_count; i++){
@@ -3066,20 +3420,25 @@ static int s_cli_srv_xchange(int a_argc, char **a_argv, void **a_str_reply)
                         }
                         DAP_DELETE(l_tickers);
                     }
-                    dap_string_prepend_printf( l_reply_str,"Tokens count pair: %zd\n", l_pairs_count);
-                    *a_str_reply = dap_string_free(l_reply_str, false);
+                    json_object_object_add(json_obj_out, "pair count", json_object_new_uint64(l_pairs_count));
+                    json_object_array_add(*json_arr_reply, json_obj_out);
                     break;
                 }
             }
 
             // No subcommand selected
-            dap_cli_server_cmd_set_reply_text(a_str_reply,"Command 'token pair' requires proper subcommand, please read its manual with command 'help srv_xchange'");
+            json_object* json_obj_out = json_object_new_object();
+            json_object_object_add(json_obj_out, "token pair status", json_object_new_string("Command 'token pair' requires proper subcommand,"
+                                                                                        "please read its manual with command 'help srv_xchange'"));
+            json_object_array_add(*json_arr_reply, json_obj_out);
 
         } break;
 
         default: {
-            dap_cli_server_cmd_set_reply_text(a_str_reply, "Command %s not recognized", a_argv[l_arg_index]);
-            return -1;
+            dap_json_rpc_error_add(*json_arr_reply, DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_UNKNOWN_COMMAND_ERR,
+                                        "Command %s not recognized", a_argv[l_arg_index]);
+            return -DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_UNKNOWN_COMMAND_ERR;
+
         }
     }
     return 0;
diff --git a/modules/service/xchange/include/dap_chain_net_srv_xchange.h b/modules/service/xchange/include/dap_chain_net_srv_xchange.h
index a5d27328816fb75e6867517d24399556c6bed705..0acf602a2703549dd2d13636689db62888f6295f 100644
--- a/modules/service/xchange/include/dap_chain_net_srv_xchange.h
+++ b/modules/service/xchange/include/dap_chain_net_srv_xchange.h
@@ -58,6 +58,76 @@ void dap_chain_net_srv_xchange_deinit();
 json_object *dap_chain_net_srv_xchange_print_fee_json(dap_chain_net_t *a_net);
 void dap_chain_net_srv_xchange_print_fee(dap_chain_net_t *a_net, dap_string_t *a_string_ret);
 
+typedef enum s_com_net_srv_xchange_err{
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_OK = 0,
+
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_REQ_PARAM_NET_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_NET_NOT_FOUND_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_UNREC_STATUS_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CANT_FIND_TOKEN_TO_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CANT_FIND_TOKEN_FROM_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_PARAM_TOKEN_SELL_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_PARAM_TOKEN_BUY_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_PARAM_TICKR_NOTF_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_TOKEN_EQUAL_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CRTE_REQ_PARAM_VALUE_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CRTE_REQ_PARAM_RATE_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CRTE_REQ_PARAM_FEE_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CRTE_REQ_PARAM_W_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_CRTE_WALLET_NOT_FOUND_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_REQ_PARAM_NET_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_NET_NOT_FOUND_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_REQ_PARAM_ORDER_ADDR_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_CAN_NOT_CONVERT_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_INCORRECT_ADDR_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_DOES_NOT_BELONG_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_HIST_DOES_NO_HISTORY_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_REQ_PARAM_NET_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_NET_NOT_FOUND_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_REQ_PARAM_W_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_WALLET_NOT_FOUND_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_REQ_PARAM_ORDER_ADDR_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_REQ_PARAM_FEE_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_RMOVE_UNKNOWN_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_REQ_PARAM_NET_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_NET_NOT_FOUND_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_NET_NOT_FOUN_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_REQ_PARAM_ORDER_ADDR_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_CANT_FIND_ORDER_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_ITS_NOT_ORDER_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_CANT_GET_PRICE_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_CANT_GET_LAST_TX_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_STATUS_CANT_FIND_LAST_TX_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_SUB_NOT_FOUND_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_ORDRS_LIST_CAN_NOT_CONVERT_ERR,
+
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_REQ_PARAM_NET_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_NET_NOT_FOUND_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_REQ_PARAM_W_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_WALLET_NOT_FOUND_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_REQ_PARAM_ORDER_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_REQ_PARAM_VALUE_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_REQ_PARAM_FEE_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PURCHASE_UNKNOWN_ERR,
+
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_LIST_UNREC_STATUS_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_LIST_REQ_PARAM_NET_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_LIST_NET_NOT_FOUND_ERR,
+
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_REQ_PARAM_NET_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_NET_NOT_FOUND_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_TOKEN_FROM_ARG_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_TOKEN_FROM_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_TOKEN_TO_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_CANT_FIND_TOKEN_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_CANT_FIND_ORDER_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_CANT_FIND_TX_ERR,
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_PAIR_UNKNOWN_ERR,
+
+    DAP_CHAIN_NODE_CLI_COM_NET_SRV_XCNGE_UNKNOWN_COMMAND_ERR
+
+} s_com_net_srv_xchange_err_t;
+
 typedef enum dap_chain_net_srv_xchange_order_status{
     XCHANGE_ORDER_STATUS_OPENED = 0,
     XCHANGE_ORDER_STATUS_CLOSED,
@@ -84,7 +154,7 @@ typedef enum dap_chain_net_srv_xchange_create_error_list{
     XCHANGE_CREATE_ERROR_NOT_ENOUGH_CASH_IN_SPECIFIED_WALLET,
     XCHANGE_CREATE_ERROR_MEMORY_ALLOCATED,
     XCHANGE_CREATE_ERROR_CAN_NOT_COMPOSE_THE_CONDITIONAL_TRANSACTION,
-    XCHANGE_CREATE_ERROR_CAN_NOT_PUT_TRANSACTION_TO_MEMPOOL,
+    XCHANGE_CREATE_ERROR_CAN_NOT_PUT_TRANSACTION_TO_MEMPOOL
 } dap_chain_net_srv_xchange_create_error_t;
 dap_chain_net_srv_xchange_create_error_t dap_chain_net_srv_xchange_create(dap_chain_net_t *a_net, const char *a_token_buy,
                                      const char *a_token_sell, uint256_t a_datoshi_sell,