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Outage in Crossref

Metadata Plus REST API not validating API keys

Resolved Major
October 05, 2026 - Started about 11 hours ago - Lasted about 4 hours
Official incident page

Incident Report

Request to the Metadata Plus pool of the REST API are receiving 401 responses (access denied). We are investigating the cause.
Components affected
Crossref Plus REST API

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Latest Updates ( sorted recent to last )
RESOLVED about 7 hours ago - at 10/05/2026 04:25PM

We have identified the problem due to a bug in a deployment. The deployment was reversed and the Plus pool of the API is working normally again.

MONITORING about 10 hours ago - at 10/05/2026 01:01PM

A fix has been implemented and we are continuing to monitor the performance of the Metadata Plus pool.

INVESTIGATING about 11 hours ago - at 10/05/2026 12:49PM

We are continuing the investigate the outage. The Plus pool was down between 12:00 and 12:36 on 5 Oct, 2026.

INVESTIGATING about 11 hours ago - at 10/05/2026 12:41PM

The API is back up but we are still investigating and monitoring.

INVESTIGATING about 11 hours ago - at 10/05/2026 12:21PM

Request to the Metadata Plus pool of the REST API are receiving 401 responses (access denied). We are investigating the cause.

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