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Use these examples to connect and subscribe to WebSocket streams.

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Kalshi WebSocket (JavaScript)

const ws = new WebSocket("wss://api.delphiterminal.co/ws/kalshi");

ws.onopen = () => {
  ws.send(
    JSON.stringify({
      action: "subscribe",
      klsi_ids: ["AMAZONFTC-29DEC31"],
      message_types: ["prices", "orderbook", "trades"],
    })
  );
};

ws.onmessage = (event) => {
  const msg = JSON.parse(event.data);
  console.log(msg);
};

​
Polymarket WebSocket (JavaScript)

const ws = new WebSocket("wss://api.delphiterminal.co/ws/poly");

ws.onopen = () => {
  ws.send(
    JSON.stringify({
      action: "subscribe",
      condition_ids: [
        "0x00000977017fa72fb6b1908ae694000d3b51f442c2552656b10bdbbfd16ff707",
      ],
      message_types: ["prices", "orderbook", "trades"],
    })
  );
};

​
Pfun and Limitless

Use the same payload shape with market_ids against:
  • wss://api.delphiterminal.co/ws/pfun
  • wss://api.delphiterminal.co/ws/limitless