Status codes
401 unauthorized; 403 no market access; 404 unknown route or symbol; 429 quota exceeded; 5xx — backoff and retry.
Glossary
API Rate Limits & Errors
Auth and quota handling must be rock solid — especially on volatile tape days.
429 handling
Read Retry-After, use exponential backoff with jitter. Throttle concurrent history backfills.
Debugging
Log request_id, route and headers. Console shows usage and request logs for spikes.
Client policy
Backoff on 429; stop blind retries on 401/403 and alert; log X-Request-Id + endpoint.
Docs
Full errors topic /docs/errors; auth /docs/auth.