# Rate Limit

## Rate Limiting Rules

| Dimension         | Rule                       |
| ----------------- | -------------------------- |
| Scope             | Per API Key                |
| Monthly quota     | 100,000 requests per month |
| Request frequency | 20 requests per minute     |

## Response Headers

| Header                | Description                                                          |
| --------------------- | -------------------------------------------------------------------- |
| X-RateLimit-Limit     | Maximum requests allowed in the current minute window                |
| X-RateLimit-Remaining | Remaining requests available in the current minute window            |
| X-RateLimit-Reset     | Reset time of the current minute window (Unix millisecond timestamp) |

## Rate Limit Exceeded

When the rate limit is triggered, a **429 Too Many Requests** response is returned:

```json
{
    "code": 42901,
    "message": "Rate limit exceeded",
    "details": {
        "limit": 20,
        "window": "60s",
        "retry_after": 45
    }
}
```


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