# GET /polymarket/order-book/{conditionId}

**Operation ID:** `GetPolymarketOrderBook`

Polymarket order book

Returns the live CLOB order book for each of a market's outcome tokens: bids, asks, and last trade price per side. Returns 404 when the conditionID has no matching tokens.

## Parameters

| Name | In | Type | Required | Description |
|------|-----|------|----------|-------------|
| `conditionId` | path | string | Yes | Required. Polymarket condition ID for the market. Example: `"0x9be56371f6a29d12769b2f196847ee825b9585ebb8bfa042136be031b081eba1"` |

## Responses

- **200**: OK
  **Schema**: ([PolymarketOrderBookResponse](https://arkm.com/llms/schemas/PolymarketOrderBookResponse.md))
- **400**: Bad Request
- **500**: Internal Server Error

## Example

```bash
curl -X GET "https://api.arkm.com/polymarket/order-book/0x9be56371f6a29d12769b2f196847ee825b9585ebb8bfa042136be031b081eba1" \
  -H "API-Key: YOUR_API_KEY"
```