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Show live Polymarket odds on a board. Load the first snapshot over the REST API, then stream fills from the trading channel to keep each price fresh.

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What you need

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1. Load the snapshot

Read the markets you care about, then pull a price per outcome token. Use midpoint for a fair mid, price for the best bid or ask, and spread for the gap. 
curl "https://api.radion.app/v1/polymarket/midpoint?token_id=123456789" \
  -H "X-API-Key: YOUR_API_KEY"

curl "https://api.radion.app/v1/polymarket/spread?token_id=123456789" \
  -H "X-API-Key: YOUR_API_KEY"
Render the board from these values. For the best bid or ask on one side, call price with token_id and side.

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2. Keep it live

Subscribe to trading filtered by your token ids. Update the matching cell on every fill instead of polling. 
import { Radion } from "@radion-app/sdk";

const radion = new Radion({ apiKey: process.env.RADION_API_KEY });
const tokenIds = ["123456789", "987654321"];

radion.realtime.onChannel("trading", (event) => {
  const fill = event.data;
  if (fill.type !== "order_filled_v2") return;
  updateBoard(fill.tokenId, fill); // your render function
});

radion.realtime.subscribe({
  id: "board",
  channel: "trading",
  filters: { token_ids: tokenIds },
});

await radion.realtime.connect();

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Tips

  • Refresh the REST snapshot on a slow timer (say every minute) to correct any drift; let the WebSocket handle the fast updates.
  • To list many markets at once, page /v1/polymarket/markets with limit and cursor.
  • Need full depth, not just top of book? Use /v1/polymarket/orderbook.

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Next steps

API reference

Endpoints, schemas, and query parameters.

trading channel

Live fill payloads to drive your board.
Last modified on July 5, 2026