> For the complete documentation index, see [llms.txt](https://gitbook-docs.coinmetrics.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gitbook-docs.coinmetrics.io/api-reference/rate-limits.md).

# Rate limits

To ensure the quality of Coin Metrics services, API is subject to rate limiting.

| Rate Limit Plan | REST API: Requests per Second (sliding window) | REST API: Download Speed | REST API: Max Parallel Requests | WebSocket API: Max Parallel Connections |
| --------------- | ---------------------------------------------- | ------------------------ | ------------------------------- | --------------------------------------- |
| Community       | 10 requests per 6 seconds per IP address       | Reduced speed            | 10                              | N/A                                     |
| Trial           | 10 requests per 6 seconds per API key          | Max speed                | 10                              | 200                                     |
| Default (PRO)   | 6000 requests per 20 seconds per API key       | Standard speed           | 10                              | 200                                     |
| Download (PRO)  | 6000 requests per 20 seconds per API key       | Max speed                | 10                              | 200                                     |

All PRO keys by default get the "default" rate limits. To download historical data at max speed, you need to switch to the "download" plan.

The paid and community versions of the API have a limit of 10 parallel REST API requests. After this limit is reached, further parallel requests will be queued, so performance will be slower.

If you reach the request-per-second limit, API starts to return `429 Too Many Requests` HTTP response status. API also provides `X-RateLimit-*` response headers formatted according to <https://tools.ietf.org/html/draft-polli-ratelimit-headers-03>. Additionally, the API provides the `X-RateLimit-Plan` header which indicates the current rate limiting plan. This header may have values: `default`, `trial`, `download`, or `community`.


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