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Polymarket Prediction Market Orderbook
blockchainsmart-moneywallettokensdefianalytics
Polymarket Prediction Market Orderbook is a paid API for AI agents from Nansen at api.nansen.ai, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-09).
Returns the full bid/ask orderbook with price levels, sizes, and cumulative depth for a Polymarket prediction market, polled every ~60 seconds.
Price / call$0.01
Success—
StatusUnknown
How this service works
Get the full bid/ask orderbook for a Polymarket prediction market. Data is polled from the Polymarket CLOB API every ~60 seconds with MD5 change detection. **What it helps to answer:** 1. **What is the current bid/ask depth for a prediction market?** 2. **How much liquidity is available at each price level?** 3. **What is the current spread?**
Output
A paginated list of orderbook levels, each containing the side (buy/sell), price, size, cumulative size, outcome label (e.g. Yes/No), asset ID, event ID, market ID, outcome index, and a snapshot timestamp indicating when the data was last polled from Polymarket.
Example use cases
Example prompt
“Can you pull the full orderbook for Polymarket market ID 654412 — I want to see all the bid and ask price levels, how much size is at each level, and the cumulative depth for both Yes and No outcomes?”
Technical details
Endpoint
POSThttps://api.nansen.ai/api/v1/prediction-market/orderbook?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need the full bid/ask depth and liquidity profile for a specific Polymarket prediction market, including cumulative order sizes and price levels for each outcome. Prefer this over generic DEX trade endpoints when you specifically want prediction market orderbook structure rather than executed trade history.
Side effects
- Invalid or non-existent market_id returns empty data array
- Market not yet indexed returns empty result
- Pagination page beyond last page returns empty data
- Rate limit or authentication failure returns HTTP 4xx error
- Stale data up to ~60 seconds old due to polling interval
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| market_idrequired | string | Polymarket market ID |
| pagination | object | Pagination parameters for API requests. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| datarequired | array | List of orderbook level records |
| pagination | object | Pagination information for API responses. |
Tags
blockchainsmart-moneywallettokensdefianalyticsprofilerdexpnlonchainprediction-marketdata
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