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Requests are rate limited per API key across three independent windows — minute, hour and day. If any window is exceeded, the API returns 429.

Limits

WindowDefaultBulk create (POST /subscribers/bulk)
Per minute6010
Per hour500100
Per day3000500
Limits are tracked per API key. Always respect the Retry-After header on a 429 before retrying.

Rate limited response

429 Too Many Requests
{
  "success": false,
  "code": "rate_limit_exceeded",
  "message": "Too many requests. Please try again later.",
  "errors": { "retry_after": 42 }
}