Live order books on Polymarket and Predict.fun

const venue = "predictfun"; // or "polymarket"
const asset = "<OUTCOME_TOKEN_ID>";
const ws = new WebSocket(
  `wss://partner-api.bravadotrade.com/stream/${venue}/market`
);
ws.onopen = () => ws.send(JSON.stringify({
  op: "sub",
  streams: [`book:${asset}`]
}));
ws.onmessage = ({ data }) => {
  const frame = JSON.parse(data);
  if (frame.type === "error") {
    console.error(frame.code, frame.message);
    return;
  }
  if (frame.channel !== "book") return;
  if (frame.type === "snapshot" || frame.type === "delta") {
    // Both frame types carry complete sides: replace your local book.
    console.log(frame.asset, frame.seq, frame.bids, frame.asks);
  } else if (frame.type === "status") {
    console.log(frame.state, frame.reason);
  }
};