# Polymarket Orderbook

> Polymarket Orderbook is a paid API for AI agents from 164.160.90.241.sslip.io, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-12).

Returns live CLOB orderbook data for a Polymarket outcome token, including best bid/ask, midpoint, spread, and full bid/ask ladders.

## Facts

- Endpoint: GET https://164.160.90.241.sslip.io/api/oracle-polymarket-orderbook?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/polymarket-orderbook-16be4ca5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1wYCRumnGMHoQ4sohQ9wM

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability polymarket-orderbook-16be4ca5
```

Example prompt: What's the current orderbook for Polymarket outcome token 71321045679652aea97d61089b484e7fde7b37c0f08c1002d0cafc7ac02a87f4 — give me the best bid, best ask, midpoint, spread, and the full bid/ask ladder?

## When to prefer this

Use this endpoint when you need real-time Polymarket prediction market orderbook data, including depth and spread, for a specific outcome token. Prefer this over general market data APIs when your use case is specifically Polymarket CLOB token pricing, liquidity analysis, or pre-trade price discovery.

## Known failure modes

- Invalid or unknown token_id returns an error or empty orderbook
- Token with no open orders returns empty bid/ask ladders
- Network timeout if Polymarket CLOB API is temporarily unavailable
- Stale data if the underlying Polymarket feed has a brief lag
- Missing token_id query parameter returns a validation error

## How this service works

Live Polymarket CLOB orderbook for an outcome token: best bid/ask, midpoint, spread and full bid/ask ladders.

## Output

Returns structured orderbook data including the best bid price, best ask price, midpoint price, spread, and the complete bid and ask ladders (price levels and quantities) for the specified Polymarket CLOB outcome token.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "token_id"
     ],
     "properties": {
      "token_id": {
       "type": "string",
       "description": "Polymarket CLOB outcome token id"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/polymarket-orderbook-16be4ca5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 164.160.90.241.sslip.io](https://www.zero.xyz/host/164.160.90.241.sslip.io/llms.txt)