| 400 | validation_errorInvalid parameter or request body | Invalid parameter or request body |
| 401 | unauthorizedNo key, or the key is wrong, revoked or expired | No key, or the key is wrong, revoked or expired |
| 402 | plan_limit_exceededsubscription_inactiveThe action exceeds your plan, or the subscription is not active | The action exceeds your plan, or the subscription is not active |
| 403 | insufficient_scopeemail_not_verifiedThe key lacks the permission; the key creator’s e-mail is not confirmed | The key lacks the permission; the key creator’s e-mail is not confirmed |
| 404 | not_foundThe object does not exist, belongs to another organization, or there is no such endpoint | The object does not exist, belongs to another organization, or there is no such endpoint |
| 409 | run_already_activeidempotency_in_progressA measurement of the project is already running; the first request with this Idempotency-Key is still in progress | A measurement of the project is already running; the first request with this Idempotency-Key is still in progress |
| 413 | payload_too_largeThe request body is larger than 1 MB | The request body is larger than 1 MB |
| 422 | idempotency_key_reusedinvalid_regionThe same Idempotency-Key with a different request; unknown region code | The same Idempotency-Key with a different request; unknown region code |
| 428 | consent_required_updateThe key creator must accept the updated terms in the dashboard | The key creator must accept the updated terms in the dashboard |
| 429 | rate_limitedtoo_many_attemptstoo_many_active_runsToo many requests or concurrent measurements — wait for Retry-After | Too many requests or concurrent measurements — wait for Retry-After |
| 503 | server_busyupstream_timeoutTemporary overload — retry after Retry-After | Temporary overload — retry after Retry-After |