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Each API key gets its own sliding-window rate limit of 120 requests per minute. The window is keyed on the API key ID — one key’s traffic doesn’t eat into another’s.

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Headers

Every response (including 429s) includes standard rate-limit headers: 
X-RateLimit-Limit: 120
X-RateLimit-Remaining: 47
X-RateLimit-Reset: 1713715260
X-RateLimit-Reset is a Unix epoch second telling you when the current window closes.

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When you hit the limit

{
  "success": false,
  "code": "RATE_LIMITED",
  "error": "Too many requests. Please try again after 2026-04-21T15:27:40.000Z"
}
Back off and retry — ideally with jitter. A short Retry-After-friendly implementation: 
async function call(url, key) {
  for (let attempt = 0; attempt < 5; attempt++) {
    const res = await fetch(url, {
      headers: { Authorization: `Bearer ${key}` },
    });
    if (res.status !== 429) return res;
    const reset = Number(res.headers.get("X-RateLimit-Reset"));
    const waitMs = Math.max(1000, reset * 1000 - Date.now());
    await new Promise((r) => setTimeout(r, waitMs));
  }
  throw new Error("rate limit exhausted");
}

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Need more throughput?

Split traffic across multiple keys (each with its own 120/min budget), or reach out and tell us what you’re building.