# Rate Limits

Each API key can make 10 requests per second. A request over the limit answers `429` with `rate_limit_exceeded`. Wait for the time in `Retry-After` and try again.

Sending also counts toward the workspace’s daily sending limit, one for each recipient. A send over that limit answers `429` with a message that names the limit. It resets at midnight UTC.

## Headers

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| `RateLimit-Policy` | string | No | The limit and window, such as `10;w=1`. |
| `RateLimit-Limit` | integer | No | Requests allowed in each window. |
| `RateLimit-Remaining` | integer | No | Requests left in this window. |
| `RateLimit-Reset` | integer | No | Seconds until the window resets. Left out at the end of a window. |
| `Retry-After` | integer | No | Seconds to wait. Only on a 429. |

## Responses

| Status | Description |
| --- | --- |
| 429 | Too many attempts. Try again later. |

429:

```json
{
  "name": "rate_limit_exceeded",
  "status": 429,
  "message": "Too many attempts. Try again later.",
  "errors": [],
  "request_id": "5f0c6a2e-8d1b-4c7a-9e3f-2b6d4a1c8e90"
}
```