# OneSignal: Intermittent errors on /api/v1/notifications api

- Impact (vendor’s label): major
- Status: resolved
- Started: 2026-09-18 00:48 UTC · Resolved: 2026-09-18 01:23 UTC · Duration: 34 min
- Updates: 3 · Affected components: APIs & SDK Endpoints
- [Vendor status page: https://status.onesignal.com/incidents/01M2RZS4E9MXR0WS6VXWHDJ248](https://status.onesignal.com/incidents/01M2RZS4E9MXR0WS6VXWHDJ248)
- [Company: OneSignal](https://rewindex.com/company/onesignal.md)

## Summary

OneSignal reported major intermittent errors creating notifications through /api/v1/notifications, affecting some customers from 2026-09-18 00:48 UTC until resolution at 2026-09-18 01:23 UTC (34 min). Heavy load on a notification service caused the errors; OneSignal scaled up resources and confirmed the endpoint was stable for all customers. _(machine-written, sol)_
## Timeline of updates

- **identified** 2026-09-18 00:48 UTC: We have identified the root cause and are working towards a resolution. Heavy load on one of our notification services is causing intermittent errors when trying to create a notification. Not all customers are affected. The team is working on adding more capacity to the affected service. We will provide another update in 15 minutes.
- **identified** 2026-09-18 01:13 UTC: A fix is rolling out now for the affected notifications services that are overloaded. Things should be stable within the next 10 minutes.
- **resolved** 2026-09-18 01:23 UTC: /api/v1/notifications create endpoint is now stable for all customers. The team has scaled up resources to handle increased load on our notifications service.

## Rewindex changes for this incident

- 2026-09-18 00:48 UTC: [Major incident: Intermittent errors on /api/v1/notifications api](https://rewindex.com/change/i2299c82b6f4a0c.md)


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Canonical: https://rewindex.com/company/onesignal/incidents/01M2RZS4E9MXR0WS6VXWHDJ248 · Markdown: https://rewindex.com/company/onesignal/incidents/01M2RZS4E9MXR0WS6VXWHDJ248.md · JSON: https://rewindex.com/api/v1/companies/onesignal/incidents/01M2RZS4E9MXR0WS6VXWHDJ248 · Generated 2026-10-18T09:46:21.747Z