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Each API key is limited to 120 requests per minute (a fixed window). Every response includes the current budget: When you exceed the limit, you get 429:

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Handling limits

  • Watch X-RateLimit-Remaining and slow down before you hit zero.
  • On a 429, back off and retry after the window resets (≤ 60s).
  • Batch where you can — a single POST /posts can target many channels at once.
Need a higher limit? Email hadi@heffl.com.