SiteCheck Polymarket Order Book

x402

SiteCheck Polymarket Order Book is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-16).

Fetches the current order book (bids, asks, spread, depth) for a Polymarket prediction market outcome token

Price / call$0.003

Seller volume →—

Success—

StatusUnknown

How this service works

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Output

Returns a structured JSON object containing the full order book: arrays of bid and ask orders (each with price and size), best bid, best ask, mid price, spread, number of bids and asks, market address, source (Polymarket CLOB API), and order book depth metrics showing liquidity within 1, 2, and 5 cents of the mid price on both sides. Also includes the last trade price and a timestamp of when the data was fetched.

Example use cases

Check liquidity before entering a trade

“Before I buy into this Polymarket market, can you pull the order book for token ID 98961942092312242488092499568359433586418736677157512843097593070222397872380 and tell me the best bid, best ask, spread, and total depth within 2 cents?”

Monitor market sentiment via mid price

“What's the current mid price and last trade price for the Polymarket market with slug 'will-the-fed-cut-rates-in-july' for the Yes outcome? I want to track how the market is moving.”

Arbitrage spread analysis

“Get me the order book for the Polymarket CLOB token 98961942092312242488092499568359433586418736677157512843097593070222397872380 — I need the full bid/ask spread and depth within 5 cents to evaluate if there's an arbitrage opportunity.”

Technical details

Endpoint

GEThttps://api.sitecheck-api.workers.dev/api/pm/orderbook?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need real-time Polymarket prediction market order book data including bids, asks, spread, and depth. It directly proxies the Polymarket CLOB API and supports lookup by numeric token ID or by market slug and outcome name. Prefer this over generic crypto exchange order book endpoints when the target is a Polymarket prediction market rather than a spot or futures asset.

Side effects

Missing or invalid tokenId returns an error — tokenId is required unless slug+outcome are provided
Unknown slug or outcome name returns no data
Polymarket CLOB API unavailability causes upstream failure
Token ID for a resolved/delisted market may return empty or stale order book
Network timeout on the Polymarket CLOB API results in a gateway error

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "mid": 0.635,
    "asks": [
      {
        "size": 577,
        "price": 0.64
      },
      {
        "size": 2691.99,
        "price": 0.65
      },
      {
        "size": 1261.03,
        "price": 0.66
      }
    ],
    "bids": [
      {
        "size": 362.87,
        "price": 0.63
      },
      {
        "size": 812.33,
        "price": 0.62
      },
      {
        "size": 100,
        "price": 0.61
      }
    ],
    "depth": {
      "asksWithin1Cent": 3268.99,
      "bidsWithin1Cent": 1175.2,
      "asksWithin2Cents": 4530.02,
      "asksWithin5Cents": 4810.02,
      "bidsWithin2Cents": 1275.2,
      "bidsWithin5Cents": 1747.07
    },
    "market": "0xadebf2aec917971a733f74c66387529b3347ebf0f3019410427921d28e921beb",
    "source": "Polymarket CLOB API (clob.polymarket.com/book)",
    "spread": 0.01,
    "bestAsk": 0.64,
    "bestBid": 0.63,
    "tokenId": "98961942092312242488092499568359433586418736677157512843097593070222397872380",
    "asksCount": 16,
    "bidsCount": 24,
    "checkedAt": "2026-10-15T18:21:04.652Z",
    "disclaimer": "Information only, not financial advice.",
    "lastTradePrice": 0.39
  }
}

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