Building a real-time gold & FX price ticker with WebSocket (Socket.IO)

If you build apps for jewelers, fintech dashboards, or e-commerce price automation, you eventually need one thing: reliable, low-latency gold and currency prices . Scraping fragile sources breaks constantly. A dedicated price API solves this. In this post I'll show how to consume real-time gold (gram, quarter, coin) and FX rates over both REST and WebSocket (Socket.IO) using the Hasfiyat Gold & Currency API . Why a price API instead of scraping? Stability — a documented contract instead of HTML that changes without notice. Low latency — prices are pushed as the market moves, not on a slow cron. Multiple sources with failover — if one provider drops, the feed keeps flowing. 1. Polling with REST The simplest integration: request the prices you need with your API key. curl -X GET \ 'https://api.hasfiyat.com/api/prices?symbols=HAS,GRAM,CEYREK' \ -H 'Authorization: Bearer YOUR_API_KEY' \ -H 'Accept: application/json' // Node.js const res = await fetch ( " https://api.hasfiyat.com/api/prices?symbols=HAS,GRAM,CEYREK " , { headers : { Authorization : " Bearer YOUR_API_KEY " } } ); const data = await res . json (); console . log ( data ); REST is ideal for periodic reporting, server-side jobs, and updating e-commerce product prices. 2. Live updates with Socket.IO For price screens, signage, and mobile apps where every tick matters, keep a connection open and let the server push changes: import { io } from " socket.io-client " ; const socket = io ( " https://api.hasfiyat.com " , { auth : { token : " YOUR_API_KEY " } }); socket . on ( " gold_prices " , ( data ) => { // { symbol: "HAS", type: "Has Altın", buy: 2450.85, sell: 2455.10, timestamp: "14:32:01.045" } console . log ( data ); }); No polling, no hammering the server — each market move arrives instantly. 3. A minimal live ticker in the browser <div id= "gold" ></div> <script src= "https://cdn.socket.io/4.7.5/socket.io.min.js" ></script> <script> const socket = io ( " https://api.hasfiyat.com " , { auth : { token : " YOUR