Short answer
Why Am I Getting a 429 Rate Limit Error?
A 429 response means the integration exceeded an API rate or concurrency limit. The safe fix is to honor Retry-After, slow or queue requests, and reduce unnecessary calls. Read the response headers and provider limit documentation, add bounded exponential backoff, cap concurrency, and cache or batch repeated lookups.
Common causes
- Too many requests are sent in a short rolling window.
- Parallel workflow branches exceed a concurrency limit.
- A loop repeats searches or updates for every item.
- Retries happen immediately and create a retry storm.
Diagnostic steps
- Capture the status, response body, Retry-After header, endpoint, and request rate.
- Identify whether the provider limits per account, user, token, endpoint, or time window.
- Queue or throttle calls and retry only after the specified delay with a maximum attempt count.
- Batch, cache, or remove duplicate requests, then monitor sustained throughput.
Example
Ten simultaneous runs each update many Airtable records and collectively exceed the limit. Serializing writes and backing off lets the queue drain safely.
Caveats
Blind retries can worsen throttling and duplicate non-idempotent actions. Some providers count failed requests against the limit.