Metatrader 5

MetaTrader 5 is widely used for charting and for running Expert Advisors, but its built-in trading functions talk to a forex or CFD broker, not to an Indian broker. The OpenAlgo MQL5 library bridges that gap: your EA keeps generating signals in MetaTrader, and every order is routed over HTTP to your OpenAlgo instance, which forwards it to whichever of the supported brokers you have connected.

How it fits together

The library is a set of MQL5 include files that you drop into MQL5\Include\OpenAlgo. It exposes six functions (PlaceOrder, PlaceSmartOrder, ModifyOrder, CancelOrder, ClosePosition, CancelAllOrders) that POST JSON to the matching /api/v1/ endpoints on your OpenAlgo server. Nothing runs inside MetaTrader beyond the HTTP call, so the broker connection, symbol mapping, analyzer mode, logging and rate limiting all stay in OpenAlgo.

Requests go out through wininet.dll, which means the EA needs Allow DLL imports enabled. It also means MQL5's WebRequest() URL allowlist is not used, so there is nothing to configure under Tools, Options, Expert Advisors, Allow WebRequest.

What the library covers

• Order placement, including smart orders that reconcile against your live position

• Order modification and cancellation

• Closing all positions or cancelling all orders for a strategy

Market data, the order book, the position book and holdings are not wrapped. Call the OpenAlgo REST API directly if your EA needs them.

Before you start

• OpenAlgo installed, running and logged in to your broker

• An OpenAlgo API key from the API Key page of the dashboard

• The URL where MetaTrader can reach OpenAlgo, typically http://127.0.0.1:5000 when both run on the same Windows machine

• Symbols written in the OpenAlgo format: SBIN for equities (no -EQ suffix), NIFTY30JAN25FUT for futures, NIFTY30JAN2521500CE for options

The pages that follow walk through installing the library, including the header, the functions it provides, and a complete EMA crossover Expert Advisor.