# Klaviyo: API 503 Errors

> Klaviyo status incident “API 503 Errors” on 2026-04-26: impact minor (vendor’s label), 47 min, 3 update(s). Archived by Rewindex.

Canonical: https://rewindex.com/company/klaviyo/incidents/pcfm8kkzbmkl
Last updated: 2026-04-26T08:11:07Z

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2026-04-26 07:24 UTC · Resolved: 2026-04-26 08:11 UTC · Duration: 47 min
- Updates: 3 · Affected components: Klaviyo API, Server-side
- [Vendor status page: https://stspg.io/ytfwjkq84bkm](https://stspg.io/ytfwjkq84bkm)
- [Company: Klaviyo](https://rewindex.com/company/klaviyo.md)

## Timeline of updates

- **identified** 2026-04-26 07:24 UTC: 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.
- **monitoring** 2026-04-26 07:43 UTC: We successfully implemented a fix as of 3:20 AM US/Eastern that restored all API activity. We are continuing to monitor the results.
- **resolved** 2026-04-26 08:11 UTC: We confirmed that all API activity has been stable since the fix was released. Any requests that returned 503 errors during the outage window will need to be retried. This incident has been resolved.

## Cite this

Status incident (vendor impact label: minor) posted by Klaviyo, started 2026-04-26 07:24 UTC, resolved after 47 min, 3 update(s).

- Canonical URL: https://rewindex.com/company/klaviyo/incidents/pcfm8kkzbmkl
- Citation: Klaviyo, “API 503 Errors” (2026-04-26 07:24 UTC). Archived by Rewindex: https://rewindex.com/company/klaviyo/incidents/pcfm8kkzbmkl (CC BY 4.0).
- Markdown link: `[Klaviyo: API 503 Errors (2026-04-26)](https://rewindex.com/company/klaviyo/incidents/pcfm8kkzbmkl)`


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Canonical: https://rewindex.com/company/klaviyo/incidents/pcfm8kkzbmkl · Markdown: https://rewindex.com/company/klaviyo/incidents/pcfm8kkzbmkl.md · JSON: https://rewindex.com/api/v1/companies/klaviyo/incidents/pcfm8kkzbmkl · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T13:49:45.923Z