Real-Time Crypto Data Streamed

// Node.js. Install: npm install ws
import WebSocket from 'ws';

const ws = new WebSocket('wss://pro-stream.coinmarketcap.com/v1', {
  headers: { 'X-CMC_PRO_API_KEY': 'your-api-key' }
});

ws.onopen = () => {
  ws.send(JSON.stringify({
    id: 1, method: 'subscribe',
    channel: 'market@crypto_latest_price',
    params: { crypto_ids: [1, 1027] }
  }));
};

ws.onmessage = (event) => {
  const msg = JSON.parse(event.data);
  if (msg.type === 'data') {
    const { cid, p, p24h } = msg.data;
    console.log(`#${cid}: $${p} (${p24h}% 24h)`);
  }
};

# Requires websockets >= 14.0
import asyncio, json, websockets

async def subscribe():
    uri = 'wss://pro-stream.coinmarketcap.com/v1'
    headers = {'X-CMC_PRO_API_KEY': 'your-api-key'}
    async with websockets.connect(uri, additional_headers=headers) as ws:
        await ws.send(json.dumps({
            'id': 1, 'method': 'subscribe',
            'channel': 'market@crypto_latest_price',
            'params': {'crypto_ids': [1, 1027]},
        }))
        async for raw in ws:
            m = json.loads(raw)
            if m.get('type') != 'data': continue
            d = m['data']
            print(f"#{d['cid']}: ${d['p']:.2f}")

asyncio.run(subscribe())