Per-key token bucket
Each API key has a token bucket with a burst of 60 tokens and a refill rate of 1 token per second. Reads cost 1 token. Writes cost 2 tokens.
When the limit is exceeded, the API returns 429 rate_limited.
Rate limit headers
Retry-After: 12
X-RateLimit-Limit: 60
X-RateLimit-Remaining: 0
X-RateLimit-Reset: 2026-06-05T12:00:00.000Z
Wait at least the Retry-After duration before retrying. Reuse the same Idempotency-Key when retrying the same write.
Resend email limit
The order resend endpoint has an additional per-order safety limit of 3 resend requests per hour.
API docs
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Last updated 2026-06-05