Pro+
Orderbook Channel
Watch orderbook depth shift in real time. Get top-of-book bid/ask prices and USD depth for every subscribed market, the moment levels change.
Requires Pro tier. This channel is not available on the Free tier. View plans & pricing
Access & scope
Available on
ProEnterprise
Subscription scope
market_idsOrderbook data is per-market. Subscribe with specific market IDs.
Subscribe
client → server
json{"action": "subscribe", "channel": "orderbook", "market_ids": ["12345"]}Example message
Each update delivers the current top-of-book snapshot as an orderbook_update message.
server → client
json{
"channel": "orderbook",
"type": "orderbook_update",
"ts": 1712847600.123,
"data": {
"type": "orderbook_update",
"market_id": "12345",
"source": "polymarket",
"yes": {"bid": 0.65, "ask": 0.67, "bid_usd": 1250.0, "ask_usd": 800.0},
"no": {"bid": 0.33, "ask": 0.35, "bid_usd": 950.0, "ask_usd": 1100.0}
}
}Tip
The bid_usd and ask_usd fields reflect dollar depth at the top of book where supported by the venue.