Skip to main content
FirstSales enforces public API rate limits by Developer API key and organization. Read routes have higher limits than write and bulk routes. Bulk imports, lifecycle actions, and billing link creation may have stricter limits because they create downstream work. When a request is rate limited, the API returns 429 with a stable error code. 
{
  "error": {
    "code": "rate_limited",
    "message": "Too many requests. Retry later.",
    "requestId": "req_123"
  }
}

​
Client behavior

  • Back off on 429.
  • Use idempotency keys for retryable mutations.
  • Prefer pagination instead of large unbounded reads.
  • Avoid parallel writes against the same campaign or contact list unless your workflow is idempotent.