# Base Mainnet Webhook Delivery Delays

- Provider: [Alchemy](https://down.guide/providers/alchemy)
- Confidence: Confirmed
- Impact: Degraded
- lasted 9h 25m
- started 2026-05-21 05:15 UTC
- Base
- Alchemy states the impact was 2026-05-21 05:00 to 07:00 UTC (2h)
- id: DWN-a0f2fe73e6
- Official page: https://stspg.io/6y9dq44ln69c

## Updates from Alchemy
### 2026-05-21 05:15 UTC: investigating
Between 05:00 - 07:00 UTC on May 21, 2026, Alchemy's Base Mainnet webhook delivery experienced delays. Customers may have received delayed webhook notifications during this time.

### 2026-05-21 14:40 UTC: resolved
Our system finished backfilling all events around May 21 14:40 UTC. Service has since returned to normal.

From the builder: does your app depend on Alchemy? [Sazabi](https://www.sazabi.com/?utm_source=down-guide&utm_medium=markdown&utm_content=alchemy) detects problems in your own logs without hand-written monitors, and you can ask it in plain language which errors mention Alchemy.

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