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Rate limits

120 requests per minute per key, RateLimit and Retry-After headers.

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120 requests per minute per key. Every response announces them, errors included:

RateLimit-Policy: "cle";q=120;w=60
RateLimit: "cle";r=117;t=42

IETF draft format draft-ietf-httpapi-ratelimit-headers-11: q the quota, w the window (seconds), r what remains, t seconds until reset. The older RateLimit-Limit, RateLimit-Remaining and RateLimit-Reset are still sent.

Beyond that: 429 with Retry-After (in seconds). Wait that long before retrying.

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