# Elevated percentage of API calls failing

- Provider: [SparkPost](https://down.guide/sparkpost)
- Level: confirmed
- Impact: Degraded
- lasted 6h 7m
- started 2025-05-13 05:22 UTC
- Metrics API - USA, Transmissions API - USA, Events API - USA +13
- eu, us
- id: DWN-a243fb7a7d
- Official page: https://stspg.io/4n920rwx827s

## Updates from SparkPost
### 2025-05-13 05:22 UTC: investigating
We are investigating an unexpected but small increase in the percentage of API calls failing since 01:30UTC. Approximately 0.015% of API calls are failing with a HTTP 504 (Gateway timeout) error. We will update this incident as we have more information.

### 2025-05-13 05:52 UTC: investigating
We are still investigating. During the period, the error rate has remained low as initially reported, approximately ~0.015%.

### 2025-05-13 06:26 UTC: identified
We have identified the cause as a set of stale IPs for an upstream service. We are now validating the approach for remediation.

### 2025-05-13 11:29 UTC: resolved
After a period of extended monitoring, we have confirmed the remediation has completely resolved the issue. Requests and error rates have been normal since 06:27UTC

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