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Polymarket Order Book
Polymarket Order Book is a paid API for AI agents from agent-data-tools.revmesh2074.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-11-06).
Returns the live CLOB order book (bids, asks, mid, spread, USD depth) for a specific Polymarket prediction market outcome
Price / call$0.01
Success—
StatusUnknown
How this service works
Polymarket order book for one market outcome from the CLOB: bids and asks (price and size) up to 50 levels, best bid and ask, mid, spread and USD depth within 5 cents of the mid on each side. Give the market slug and outcome, or a CLOB token id. Use to check liquidity and slippage before a trade, or to read a sharper price than the last trade.
Output
Returns a JSON object with: arrays of bid and ask levels each containing price and size, best bid and ask prices, mid price, spread, USD depth within 5 cents of mid on bid and ask sides, the market slug, outcome name, CLOB token ID, condition ID, market question text, and a timestamp of when the book was read. Optionally includes a note field for warnings or context.
Example use cases
Pre-trade slippage check
“Before I buy $1,000 worth of Yes shares on the Polymarket 'will-btc-hit-100k-in-2025' market, can you check the order book and tell me how much slippage I should expect?”
Sharp price discovery
“What's the current mid price and spread on the No outcome of the Polymarket Trump election market? I want a sharper price than the last trade shows.”
Liquidity depth monitoring
“Check the Polymarket order book for the Yes side of the 'us-recession-2025' market and tell me how much USD is sitting within 5 cents of the mid on each side.”
Technical details
Endpoint
GEThttps://agent-data-tools.revmesh2074.workers.dev/polymarket/orderbook?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need live order book data for a Polymarket prediction market — specifically to assess liquidity, calculate expected slippage before trading, or get a more accurate current price than the last-trade price. Prefer it over last-trade price endpoints when market microstructure matters (thin books, wide spreads). Use the token_id parameter when you already have the CLOB token from another Polymarket endpoint, or use slug+outcome for a more human-readable query.
Side effects
- Invalid or unknown market slug returns an error — use polymarket_markets to find valid slugs
- Unknown outcome name returns an error — verify exact outcome string (e.g. 'Yes' vs 'yes')
- Invalid token_id returns an error or empty book
- Depth out of range (not 1–50) returns a validation error
- Market with no open orders returns empty bids or asks arrays
- CLOB API downtime may cause timeouts or stale data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| slug | string | The market's Polymarket slug (from polymarket_markets) or its polymarket.com URL |
| depth | integer | Levels per side, 1-50 (default 10) |
| outcome | string | Outcome name, e.g. Yes or No (default the first outcome) |
| token_id | string | Instead of slug: the CLOB token id of one outcome |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| mid | number | |
| asks | array | |
| bids | array | |
| note | string | |
| slug | string | |
| spread | number | |
| bestAsk | number | |
| bestBid | number | |
| outcome | string | |
| tokenId | string | |
| bookTime | string | |
| question | string | |
| askDepthUsd | number | |
| bidDepthUsd | number | |
| conditionId | string |
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