MT5 API: one REST & WebSocket API for MetaTrader 5

# account summary of a connected MT5 account
curl -s -H "x-api-key: $MTAPI_KEY" \
  "https://api.metatraderapi.net/AccountSummary?id=$MTAPI_ID"

# a market order that is safe to retry
curl -s -H "x-api-key: $MTAPI_KEY" \
  "https://api.metatraderapi.net/OrderSend?id=$MTAPI_ID&symbol=EURUSD&operation=Buy&volume=0.01&clientOrderId=order-0001"
# "state": 10009 means filled; any other value is the broker's reason

import os, requests

API = "https://api.metatraderapi.net"
s = requests.Session()
s.headers["x-api-key"] = os.environ["MTAPI_KEY"]
ACCOUNT = os.environ["MTAPI_ID"]          # the account's UUID

summary = s.get(f"{API}/AccountSummary", params={"id": ACCOUNT}, timeout=75).json()
print(summary["balance"], summary["equity"], summary["currency"])

order = s.get(f"{API}/OrderSend", params={"id": ACCOUNT, "symbol": "EURUSD",
              "operation": "Buy", "volume": 0.01, "clientOrderId": "order-0001"}, timeout=75).json()
print("filled" if order.get("state") == 10009 else f"refused: {order.get('state')}")

const API = "https://api.metatraderapi.net";
const headers = { "x-api-key": process.env.MTAPI_KEY };
const id = process.env.MTAPI_ID;

const res = await fetch(`${API}/GetQuote?id=${id}&symbol=EURUSD`, { headers });
const quote = await res.json();
console.log(quote.bid, quote.ask);

// live quotes, positions and trades over one WebSocket
const ws = new WebSocket(`wss://api.metatraderapi.net/v1/stream?id=${id}`, { headers });
ws.onopen = () => ws.send(JSON.stringify({ action: "subscribe", symbol: "EURUSD" }));