real time stock screener websocket api

Build a Real-Time Stock and Forex Screener with WebSocket API

Screen stocks, Forex pairs, and crypto simultaneously using WebSocket multi-symbol streams and server-side filter logic.

Runnable example

WebSocket screener with move threshold

const ws = new WebSocket(
  "wss://api.realmarketapi.com/price?symbolCode=AAPL&timeFrame=M1&apiKey=YOUR_KEY"
);

const THRESHOLD = 0.5; // % move
ws.onmessage = (e) => {
  const { ClosePrice, OpenPrice, SymbolCode } = JSON.parse(e.data);
  const pct = ((ClosePrice - OpenPrice) / OpenPrice) * 100;
  if (Math.abs(pct) >= THRESHOLD) {
    console.log(`Screener hit: ${SymbolCode} moved ${pct.toFixed(2)}%`);
  }
};

Production notes

Open one WebSocket connection per symbol to avoid cross-symbol message interleaving.
Apply screener filters server-side before pushing results to clients to reduce payload size.
Debounce screener re-evaluation to one pass per completed candle, not every tick.

Next steps

Try in playground Compare plans Create free account

real time stock screener websocket api

Build a Real-Time Stock and Forex Screener with WebSocket API

Screen stocks, Forex pairs, and crypto simultaneously using WebSocket multi-symbol streams and server-side filter logic.

Runnable example

WebSocket screener with move threshold

const ws = new WebSocket(
  "wss://api.realmarketapi.com/price?symbolCode=AAPL&timeFrame=M1&apiKey=YOUR_KEY"
);

const THRESHOLD = 0.5; // % move
ws.onmessage = (e) => {
  const { ClosePrice, OpenPrice, SymbolCode } = JSON.parse(e.data);
  const pct = ((ClosePrice - OpenPrice) / OpenPrice) * 100;
  if (Math.abs(pct) >= THRESHOLD) {
    console.log(`Screener hit: ${SymbolCode} moved ${pct.toFixed(2)}%`);
  }
};

Production notes

Open one WebSocket connection per symbol to avoid cross-symbol message interleaving.
Apply screener filters server-side before pushing results to clients to reduce payload size.
Debounce screener re-evaluation to one pass per completed candle, not every tick.

Next steps

Try in playground Compare plans Create free account