Rate limits

To ensure the quality of Coin Metrics services, API is subject to rate limiting.
The community version of API has the limit of 10 requests per 6 seconds sliding window for an IP address.
The trial version of API has the limit of 10 requests per 6 seconds sliding window for an API key.
The paid version of API has the limit of 6000 requests per 20 seconds sliding window for an API key.
The paid and community versions of the API have a limit of 10 parallel HTTP requests, after this limit is reached further parallel requests will be queued, so performance will be slower.
The paid version of API has a limit of 200 concurrent websocket connections for an API Key.
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.