Outage in Crossref
Degraded performance on Public and Polite REST API
Resolved MinorIncident Report
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.
Components affected
Crossref Public REST API Crossref Crossmark dialog server Crossref Public content negotiation Crossref Polite content negotiation Crossref Polite REST API Crossref Metadata searchTrusted by 1,000+ teams
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Latest Updates ( sorted recent to last )
RESOLVED
about 1 month ago - at 06/24/2026 09:43AM
This incident has been resolved.
MONITORING
about 1 month ago - at 06/23/2026 04:24PM
We are continuing to monitor our fixes for any further issues affecting the Public and Private REST APIs, Crossmark, content negotiation, and metadata search.
MONITORING
about 1 month ago - at 06/23/2026 09:01AM
We experienced a couple of downtimes for the Public REST API at 3:09 and 4:15 UTC due to high rates of requests. We are continuing to implement fixes and are monitoring the degraded performance on the Public and REST APIs.
MONITORING
about 1 month ago - at 06/22/2026 11:39AM
We have deployed and are monitoring a fix for this issue that affected our APIs and Metadata Search.
IDENTIFIED
about 1 month ago - at 06/22/2026 11:22AM
We are continuing to work on a fix for the performance issue.
IDENTIFIED
about 1 month ago - at 06/22/2026 10:20AM
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.
Latest Crossref outages
Login issues affecting Crossref services - 20 days ago
Cursor requests not returning all results in the REST API - about 1 month ago
Investigating an outage - about 2 months ago
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