> ## Documentation Index
> Fetch the complete documentation index at: https://docs.zenamu.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Status codes

All responses use standard HTTP status codes.

## Success

| Status | Meaning                                             |
| -----: | --------------------------------------------------- |
|  `200` | The request succeeded. The payload is under `data`. |

Bulk grants return `200` even when some items failed. Read
`results[].success` per item — see [Errors](/api/errors#partial-success).

## Errors

| Status | Meaning                                                                                                                                          |
| -----: | ------------------------------------------------------------------------------------------------------------------------------------------------ |
|  `400` | A required parameter is missing, the `Authorization` header is malformed, or body validation failed.                                             |
|  `401` | No API key was sent.                                                                                                                             |
|  `403` | The key is valid, but your plan does not cover the endpoint or a targeted non-default pass group. See [Plans and access](/api#plans-and-access). |
|  `404` | The API key was not recognized, or the client in the path is not in your studio.                                                                 |
|  `429` | You exceeded 100 calls per minute on this endpoint. See [Rate limits](/api/rate-limits).                                                         |
|  `500` | An unexpected server error. Retry with backoff if the call is safe to repeat.                                                                    |

<Warning>
  `404` carries two very different meanings. On a list endpoint it can only be an
  unrecognized API key. On `/v1/clients/{clientId}/credits` it can also mean the
  client does not exist in your studio. Read the `message` to tell them apart.
</Warning>