Crossref incident

Degraded performance on Public and Polite REST API

Minor Ongoing View vendor source →

Crossref is currently experiencing a minor incident affecting Public REST API and Polite REST API and 1 more component, which began 2h ago. The vendor's full update timeline is below.

Started
Jun 22, 2026, 10:20 AM UTC
Resolved
Ongoing
Duration
● 1h 53m
Detected by Pingoru
Jun 22, 2026, 10:20 AM UTC

Affected components

Public REST APIPolite REST APIMetadata searchCrossmark dialog serverPublic content negotiationPolite content negotiation

Update timeline

  1. identified Jun 22, 2026, 10:20 AM UTC

    We are receiving a very large number of requests from a user that is applying various strategies to get around our rate limits on our public REST API pool. This is impacting performance, including on the public and polite REST API pools, Crossmark, content negotiation, Crossref Metadata Search and reference matching. We are investigating solutions.

  2. identified Jun 22, 2026, 11:22 AM UTC

    We are continuing to work on a fix for the performance issue.

  3. monitoring Jun 22, 2026, 11:39 AM UTC

    We have deployed and are monitoring a fix for this issue that affected our APIs and Metadata Search.