Why
An API key never gets this code, and test lookups do not count. A retry with the sameIdempotency-Key does not count again. Retry-After gives the seconds until midnight UTC, at most 3600.
What to do
Run the lookup in the test environment, or wait until midnight UTC. To assess more live identities, send them with an API key.console_lookups on GET /v1/workspaces/{workspace_id}/usage shows how many are left today and when the count resets.
This error is temporary. A retry with the same Idempotency-Key is safe.
In the SDKs
The Node and Python SDKs raiseRateLimitError. The Go SDK returns *apierrors.RateLimitError, which you match with errors.As.