Elevated percentage of API calls failing

What to do

• Check whether you use SparkPost Metrics API - USA, Transmissions API - USA, Events API - USA, SMTP API - USA and 12 more in eu, us. Check your stack

  Drop a package.json, lockfile, Terraform or a list of domains at down.guide to see every provider you depend on.

• Confirm your retries, queues and scheduled jobs caught up after the 6h 7m it lasted.

  Anything that failed between 2025-05-13 05:22 UTC and 2025-05-13 11:29 UTC may need a replay.

• Subscribe to SparkPost's feed to hear about the next one first. RSS feed

  https://down.guide/feed?provider=sparkpost works in Slack (/feed subscribe), Discord feed bots and any RSS reader.

Updates from SparkPost 4

1. investigatingMay 13, 2025, 5:22 AM UTC

   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.

   provider

2. investigatingMay 13, 2025, 5:52 AM UTC

   We are still investigating. During the period, the error rate has remained low as initially reported, approximately ~0.015%.

   provider

3. identifiedMay 13, 2025, 6:26 AM UTC

   We have identified the cause as a set of stale IPs for an upstream service. We are now validating the approach for remediation.

   provider

4. resolvedMay 13, 2025, 11:29 AM UTC

   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

   provider

Corrections

None so far.

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