Rate limits

Requests are limited per API key. The default limit is 60 requests per minute.

429 response

When the limit is exceeded the API returns 429 Too Many Requests with an ApiProblem body:

{ "status": 429, "error": "Too many requests." }

Handling rate limit errors

Back off and retry after a short delay when you receive a 429. Spread burst traffic across multiple seconds rather than sending all requests simultaneously.

For high-volume use cases, batch validation (POST /api/v1/verify/batch) is more efficient than many individual single-verify calls — one request uploads an entire CSV file.