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Every key has a per-minute limit and a per-day quota set by its tier. The day resets at midnight UTC.

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A request over either limit returns 429 with Retry-After in seconds, and a code saying which limit was hit: rate_limited or daily_quota_exceeded.
Graph data changes once an hour and most insight endpoints are cached for a minute or more. Poll at that pace and cache on your side; faster polling spends quota without newer data.