1. Communication Protocols in Algorithmic Trading

• REST API (HTTP/2): Ideal for account inquiries, historical OHLCV data fetching, and order cancellation. Request-response model.
• WebSockets (WSS): Persistent bidirectional TCP pipe. Streams continuous millisecond tick updates directly to your bot's memory without polling overhead.
• FIX Protocol (Financial Information eXchange): Institutional-grade binary messaging protocol used by Tier-1 banks, proprietary trading desks, and major ECN brokers for ultra-low latency execution.

2. WebSocket Price Ingestion Engine

import WebSocket from 'ws';

const ws = new WebSocket('wss://stream.darkais.com/forex/eurusd');

ws.on('open', () => {
    console.log('[WSS CONNECTED] Subscribing to live EUR/USD tick feed...');
    ws.send(JSON.stringify({ action: "subscribe", pair: "EUR/USD" }));
});

ws.on('message', (raw) => {
    const tick = JSON.parse(raw);
    console.log(`[TICK] ${tick.symbol} | Bid: ${tick.bid} | Ask: ${tick.ask} | Latency: ${Date.now() - tick.timestamp}ms`);
    // Pass directly to strategy engine
    strategyEngine.onTick(tick);
});

3. Knowledge Check Exam