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The price feed streams market/orderbook updates. Payloads mirror the previous Socket.IO price stream events, without the Socket.IO envelope. 
// price_feed_quickstart.js 
const WebSocket = require('ws'); 
const token = process.env.FOURCASTERS_TOKEN; 
 
function connectPriceFeed() { 
  const ws = new 
  WebSocket('wss://streaming-api.4casters.io/price-stream', { 
    headers: { Authorization: token }, 
  }); 
 
  let pingTimer; let lastPong = Date.now(); 
 
  ws.on('open', () => { 
    console.log('price stream connected'); 
    pingTimer = setInterval(() => { 
      if (ws.readyState === WebSocket.OPEN) ws.ping(); 
      if (Date.now() - lastPong > 30000) { 
        console.warn('price stream: missed pong >30s, closing'); 
        ws.terminate(); 
      } 
    }, 10000); 
  }); 
 
  ws.on('pong', () => { lastPong = Date.now(); }); 
 
  ws.on('message', (buf) => { 
    try { 
      const msg = JSON.parse(buf.toString()); 
      console.log('price update:', JSON.stringify(msg, null, 2)); 
    } catch { console.log('price update (raw):', buf.toString()); } 
  }); 
 
  ws.on('error', (e) => console.error('price stream error:', e.message)); 
 
  ws.on('close', (code, reason) => { 
    console.log(`price stream closed: ${code} ${reason}`); 
    clearInterval(pingTimer); 
    setTimeout(connectPriceFeed, 1000); 
  }); 
} 
connectPriceFeed();

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Ping/Pong

Both feeds support standard WebSocket ping/pong. You may proactively ping() on an interval and track pong to verify liveness.