# Health check

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/health

- operationId: `health-check`
- docs: https://docs.1delta.io/1delta-api/health-check/
- markdown: https://docs.1delta.io/1delta-api/health-check.md
- tags: General

Health check

Returns service health status.

**Response `200`** — Service health

| Field | Type | Description |
| --- | --- | --- |
| `success` | true |  |
| `data` | object |  |
| `data.latestHour` | string | Latest data generation hour |
| `actions` | null |  |

**Example response**

```json
{
  "success": true,
  "data": {
    "latestHour": "2026-01-01T00:00:00Z"
  }
}
```

**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.