429 application/problem+json
application/problem+json. Branch on type (a stable URI), not on title
or detail (human-readable, may change).
When it occurs
Your key exhausted its request ceiling for the trailing 30-day window. The 429 body carriesquota_kind: "monthly", limit, tier_name, and a kind-aware reset_at.
How to fix
Monthly quotas restore progressively as usage ages out of the trailing 30-day window —reset_at marks when the next slot frees up, not when the full ceiling returns. Sleep on Retry-After / retry_after_seconds, or upgrade your tier. See Rate limits.
Retryable — retry with exponential backoff (respect Retry-After on 429/503).
See the full error catalog for the response shape and retry matrix.
Every response carries an x-request-id header — include it in any support request.