API 503 Errors
Incident Lifecycle
Incident Timeline
Monitoring
We successfully implemented a fix as of 3:20 AM US/Eastern that restored all API activity. We are continuing to monitor the results.
Apr 26, 2026 at 7:43 AM UTC
Identified
Starting at approximately 2:27 AM US/Eastern on 04/25/2026, we began experiencing intermittent elevated errors across our APIs. Some customers may experience 503 errors when trying to log into Klaviyo, load certain pages or make API requests. Our Engineering Team has identified the root cause and has implemented mitigations. We'll provide updates as soon as more information is available.
Apr 26, 2026 at 7:24 AM UTC
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