Amplitude 429 Throttling Errors
Quick answer
429 errors appear in the Ingestion Monitor when request volume per second spikes. Batch events, lower replay sample rate or ask Support to raise the threshold.
Most likely fix: Reduce request rate
How to fix it
Try these in order — the most common fix is first.
1. Reduce request rate
- Lower the Session Replay sample rate
- Increase batch size and flush interval
Did this fix it?2. Ask Support
- Contact Amplitude Support before a planned spike to adjust the throttle threshold
Did this fix it?
Symptoms
Dropped or delayed events and short replays during traffic peaks.
Why it happens
- Traffic or campaign spike
- High Session Replay sample rate
- Many small requests
This guide also covers
- amplitude 429 error
- amplitude throttling
- amplitude rate limit
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