Crossref Outage History
Uptime record, past incidents, and downtime history for Crossref.
Checking current status...
90-Day Trend
Monthly Uptime
| Month | Uptime | Days Tracked | Days with Issues |
|---|---|---|---|
| June 2026 | 55.6% | 27 | 12 |
| May 2026 | 51.6% | 31 | 15 |
| April 2026 | 83.3% | 30 | 5 |
| March 2026 | 66.7% | 3 | 1 |
Uptime is calculated from daily worst-status snapshots. A day with any non-operational status counts as a day with issues.
Daily Status (Last 91 Days)
Mar 29
Today
Operational
Degraded
Partial Outage
Major Outage
Maintenance
No Data
Incident History
June 2026
Degraded performance on Public and Polite REST API
Started: Jun 22, 10:20 AM
monitoring
We are continuing to monitor our fixes for any further issues affecting the Public and Private REST APIs, Crossmark, content negotiation, and metadata search.
Jun 23, 4:24 PM
monitoring
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.
Jun 23, 9:01 AM
monitoring
We have deployed and are monitoring a fix for this issue that affected our APIs and Metadata Search.
Jun 22, 11:39 AM
identified
We are continuing to work on a fix for the performance issue.
Jun 22, 11:22 AM
identified
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.
Jun 22, 10:20 AM
Investigating an outage
Started: Jun 16, 8:15 AM
monitoring
A fix has been implemented. The services are available again and working as expected. We are now monitoring their performance and continuing to investigate the cause of the incident.
Jun 16, 8:41 AM
investigating
We are investigating an incident with multiple tools and services including:
- Web deposit form (https://apps.crossref.org/webDeposit)
- Participation Reports (https://crossref.org/members/prep/)
- Browsable title list (https://www.crossref.org/titleList/)
- Other reports and forms under crossref.org
Starting from around 04.16am UTC on 16 June, users attempting to access these tools have been receiving 503 errors.
Our technical team are investigating. We'll provide updates as soon as we k...
Jun 16, 8:15 AM
May 2026
Degraded service on REST API
Started: May 29, 12:12 PM
monitoring
We are continuing to monitor for any further issues.
Jun 1, 4:11 PM
monitoring
A fix has been implemented and we are monitoring the results.
May 29, 2:33 PM
investigating
We are experiencing delays in updating some metadata fields on the REST API. This includes citation counts, Retraction Watch retractions, aliased DOIs, and metadata in the member, journal, and funder routes. We are currently investigating the cause.
May 29, 12:12 PM
Test admin tool - test.crossref.org - returning 503 status code errors after today's deployment
Started: May 14, 4:10 PM
investigating
We are currently investigating this issue.
May 14, 4:10 PM
Bug identified, possibly resulting in failed submissions. Emergency maintenance scheduled.
Started: May 8, 4:59 PM
monitoring
Emergency release version 0.274.2 has been released. We are monitoring the results.
May 8, 7:04 PM
identified
The issue has been identified and a fix is being implemented.
May 8, 7:01 PM
investigating
We are continuing to investigate this issue.
May 8, 6:39 PM
investigating
We have identified a bug in our system which may result in failing submissions at this time. An emergency release is scheduled for approximately 1900 UTC with a fix.
During the release, our members may experience delays in deposit system admin tool (doi.crossref.org) processing. Deposits submitted during that time will be stored and processed after the maintenance has been completed.
May 8, 4:59 PM
April 2026 JSON Snapshot is missing data for records created or updated on 4/29 and 4/30
Started: May 4, 1:45 PM
identified
The corrected JSON snapshot is in process. It will be completed and available in the next 2-3 days.
May 5, 12:38 PM
identified
Due to problems with API indexing that occurred between 4/29 and 5/3, the current JSON snapshot for April 2026 is missing 1-2 days of data. We've resolved the indexing issue and are currently re-pushing the missing records into the API. Once that's completed, over the next few days, we'll build and release a new snapshot for April.
May 4, 1:45 PM
REST API Indexing Stalled since April 29th. Impacts on downstream services.
Started: May 2, 4:37 PM
monitoring
Records are being indexed in the REST API as expected again. This includes the backlog of records that were affected by this incident.
May 4, 9:41 AM
investigating
We've resolved the issue. Records are being indexed in the REST API as expected again. This includes the backlog of records that were affected by this incident.
May 4, 8:03 AM
investigating
We are continuing to investigate this issue.
May 3, 11:24 PM
investigating
No newly created records have been index in REST API since 4/29. Our technical team is investigating.
Impacts on downstream services such as Crossmark, Participation Reports, Metadata Search, and Co-Access/Multiple Resolution interim pages.
May 2, 4:37 PM
April 2026
Main website down between 05:46 UTC and 06:47 UTC
Started: Apr 17, 6:32 AM
monitoring
The website is available again. We are monitoring the situation.
Apr 17, 7:04 AM
investigating
The main Crossref website (www.crossref.org) has been down since 05:46 UTC. We are investigating the cause of the issue.
Apr 17, 6:32 AM
Depositor reports returning gateway timeout errors
Started: Apr 3, 6:31 PM
monitoring
A fix has been implemented and we are monitoring the results.
Apr 3, 6:35 PM
investigating
Our depositor reports (e.g., https://data.crossref.org/depositorreport?pubid=J533343) are returning status code 504 gateway timeout errors. We're aware of the issue and our technical team is investigating. -IF
Apr 3, 6:31 PM