# Boros order book

Endpoint reference for the 1delta API. Index: https://docs.1delta.io/llms.txt · every endpoint: https://docs.1delta.io/llms-full.txt

---

### GET /v1/data/boros/book

- operationId: `boros-book`
- docs: https://docs.1delta.io/1delta-api/boros-book/
- markdown: https://docs.1delta.io/1delta-api/boros-book.md
- tags: Boros (Data)

Boros order book

The live book of one market with AMM liquidity merged. `bids` are resting LONG orders (what a SHORT taker fills against, best = highest APR); `asks` are resting SHORT orders. Levels are `{ aprPct, size }`, size in collateral units.

**Parameters**

| Name | In | Type | Required | Description |
| --- | --- | --- | --- | --- |
| `marketId` | query | string | yes | Boros market id |

**Response `200`** — `{ marketId, bids[], asks[] }`

| Field | Type | Description |
| --- | --- | --- |
| `success` | true |  |
| `data` | object | Informational payload. `null` when the endpoint only builds calldata. |
| `actions` | null |  |

**Example response**

```json
{
  "success": true,
  "data": {}
}
```

**Response `400`** — Validation error

**Response `429`** — Rate limited. Unauthenticated callers share a per-IP budget; send an `x-api-key` header to lift it. Retry with exponential backoff.

**Response `500`** — Unexpected server error. Safe to retry with backoff.

**Response `502`** — An upstream data source or protocol origin failed (`error.code` is `ORIGIN_FAILED`). `error.details` carries the per-origin status. This is also what a missing or malformed required parameter currently returns, rather than a 400.