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Each API key is rate limited independently. The default ceiling is 100 requests per minute. Successful responses include the per-window maximum in the X-RateLimit-Limit header.

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When you hit the limit

Exceeding the limit returns 429 Too Many Requests with a rate_limit_error: 
{
  "error": {
    "type": "rate_limit_error",
    "code": "rate_limit_exceeded",
    "message": "Too many requests. Slow down."
  }
}
Back off and retry. A simple exponential strategy works well: 
let delay = 1000;
for (let attempt = 0; attempt < 5; attempt++) {
  const res = await fetch(url, opts);
  if (res.status !== 429) return res;
  await new Promise((r) => setTimeout(r, delay));
  delay *= 2;
}

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Raising the limit

If your workload genuinely needs a higher ceiling — for example a large catalog backfill — contact support to discuss a per-organization increase.