Order Book API — Live Bids, Asks, and Price History

Fetch live bid/ask depth and price history for any Polymarket market token via Kuroko’s CLOB proxy. Rate limited to 60 requests per minute per IP.

Kuroko’s order book proxy gives you CORS-safe access to Polymarket’s Central Limit Order Book (CLOB). Use it to fetch live bid/ask depth and historical price data for any market token — the same data powering the order terminal.

Endpoints

GET /api/clob/order-book

Returns the live order book for a market token, including the top bids and asks.

token_id · string · required

The Polymarket token ID for the YES or NO outcome of a market. Find token IDs on the markets endpoint.

curl "/api/clob/order-book?token_id=21742633143463906290569050155826241533067272736897614950488156847949938836455"

Response

{
  "bids": [
    { "price": "0.43", "size": "1200.00" },
    { "price": "0.42", "size": "850.50" }
  ],
  "asks": [
    { "price": "0.44", "size": "975.00" },
    { "price": "0.45", "size": "2100.00" }
  ]
}

bids · array

Descending list of buy orders. Each entry has price (probability as decimal, e.g. "0.43" = 43%) and size (shares available).

asks · array

Ascending list of sell orders. Each entry has price and size.

GET /api/clob/prices-history

Returns the historical price series for a market token.

market · string · required

The Polymarket token ID.

interval · string

Time interval for the history. One of 1d, 1w, 1m, 3m. Defaults to 1d.

curl "/api/clob/prices-history?market=21742633143463906290569050155826241533067272736897614950488156847949938836455&interval=1w"

Rate limits and errors

Status	Meaning
200	Success
429	Rate limit exceeded — 60 requests/minute per IP. Retry after 60 seconds.
413	Request body too large (POST requests only, max 20,000 characters)
502	CLOB upstream unavailable

The order book proxy forwards requests to Polymarket’s CLOB API. The response format matches Polymarket’s native CLOB API.