Monitoring multiple crypto exchanges online via MQL5 library for Node.js/CCXT – Other – 5 July 2025

CcxtAppServerLib is meant for working with all top-100 crypto exchanges from MQL5 through Node.js and CCXT Utility Server, and it’s evolving step-by-step. Newest beta-version contains optimized caching of alternate “markets” (instrument specs and different buying and selling situations), non-blocking studying of websocket messages, and extra.

One introductory instance of utilizing the library – the script CcxtAppSrvShowcase.mq5 – was posted within the weblog earlier.

As one other instance of customized software growth utilizing the library, we offer a script for parallel monitoring of a number of exchanges for chosen sort of knowledge. This function is applied by subscribing by CCXT on Node.js to particular websocket “watches”, equivalent to watchOrderBook, watchTicker, watchTrades, and many others. For particulars, please, see widespread CCXT documentation and extra superior on CCXT PRO. Because the script is meant to make use of solely public APIs, consumer credentials should not concerned right here, however the library helps them in full diploma.

First, embrace the headers.

#embrace "ccxtjsmtlib.mqh" 
#embrace "ccxtutil.mqh"
#embrace <MQL5Book/Feedback.mqh>

Within the inputs, the Node server setup ought to be accomplished.

enter group "Connection settings"
enter string NodeServer = "http://127.0.0.1:8124";
enter string NodeAuth = ""; 

To fill in these inputs correctly with most popular values, you must in all probability must output the checklist of supported exchanges and their markets beforehand. It may be seen in one other instance script CcxtAppSrvShowcase.mq5, supplied with the lib.

enter string Exchanges = "ascendex,bitmart,binance"; 
enter string Ticker = "BCH/USDT";
enter string Watch = "watchOrderBook";
enter uint WatchingDuration = 10; 

Then OnStart occasion handler does its job. Inline feedback clarify the method. The imported features, lessons and strategies from the library are highlighted in yellow.

string Change[];

void OnStart()
{
   
   
   
   PrintFormat("CCXT AppSrvLibrary model: %.2f", AppSrvLibraryVersion());
   const static string standing[] = {"Cannot deploy",
      "App server ZIP is deployed, however not extracted",
      "App server information are deployed"};
   const int d = DeployCcxtAppServer();
   Print(standing[d + 1]);
   if(d <= 0)
   {
      return; 
   }
   
   
   
   
   SetNodeServer(NodeServer, NodeAuth);

   CcxtLink *hyperlink = GetLink();
   
   
   

   
   
   AutoPtr<CcxtJsExchangeProIntf> ccxt[];
   const int n = StringSplit(Exchanges, ',', Change);
   ArrayResize(ccxt, n);
   
   for(int i = 0; i < n; i++)
   {
      ccxt[i] = CreateExchangePro(Change[i]); 

      if(hyperlink.getLastHttpCode() != 200 || !ccxt[i][] || ccxt[i][][].t >= JS_NULL)
      {
         Print("Development failed for alternate: ", Change[i]);
         return;
      }
      
      const bool isPro = !!*ccxt[i][]["pro"]; 
      
      if(!isPro)
      {
         PrintFormat("WARNING! %s is not PRO, there is no such thing as a websocket assist", Change[i]);
      }
      
      if(!ccxt[i][]["has"][Watch].get<bool>())
      {
         PrintFormat("WARNING! %s doesn't assist '%s' subscriptions", Change[i], Watch);
      }
   }
   
   
   
   int energetic = 0;
   
   for(int i = 0; i < n; i++)
   {
      
      if(ccxt[i][].improve())
      {
         if(!ccxt[i][].watchAnything(StringFormat("%s("%s")", Watch, Ticker)))
         {
            PrintFormat("Cannot begin %s for %s", Watch, Change[i]);
            ccxt[i][].shut(); 
            ccxt[i] = NULL;
         }
         else
         {
            energetic++;
         }
      }
      else
      {
         if(ccxt[i][].isConnected())
         {
            Print("Cannot improve to websockets");
            string headers[][2];
            if(ccxt[i][].ws().getHeaders(headers))
            {
               
            }
            ccxt[i][].ws().shut(); 
            ccxt[i][].shut();
            ccxt[i] = NULL;
         }
      }
   }
   
   if(!energetic) return;

   
   PrintFormat("* Monitoring %d subscriptions", energetic);

   const uint begin = GetTickCount();
   whereas(!IsStopped() && (!WatchingDuration || GetTickCount() - begin < WatchingDuration * 1000))
   {
      for(int i = 0; i < n; i++)
      {
         if(ccxt[i][] && ccxt[i][].isConnected())
         {
            AutoPtr<JsValue> j = ccxt[i][].readMessage(false); 
            if(j[])
            {
               ChronoComment(j[].stringify(0, 0)); 
            }
         }
      }
   }
  
   Print("* Unsubscribing...");
   for(int i = 0; i < n; i++)
   {
      if(ccxt[i][] && ccxt[i][].isConnected())
      {
         ccxt[i][].un().watchAnything(StringFormat("%s("%s")", Watch, Ticker));
      }
   }
   
   
   GracefullClose(ccxt); // not introduced right here within the weblog

   
   
   GracefullClose(ccxt, 5, true);
   
   Remark("");
}