Crossref API

90-day uptime

Monitoring since 2026-06-11 · 32 days of data

OperationalDegradedOutageNo data

Past incidents

Jul 13, 2026

No incidents reported.

Jul 12, 2026

No incidents reported.

Jul 11, 2026

No incidents reported.

Jul 10, 2026

No incidents reported.

Jul 9, 2026

No incidents reported.

Jul 8, 2026

No incidents reported.

Jul 7, 2026

No incidents reported.

Jul 6, 2026

No incidents reported.

Jul 5, 2026

No incidents reported.

Jul 4, 2026

No incidents reported.

Jul 3, 2026

No incidents reported.

Jul 2, 2026

No incidents reported.

Jul 1, 2026

No incidents reported.

Jun 30, 2026

• 08:31 UTCGuardian-measuredResolvedAPI: Unreachable · resolved after 3m

Jun 25, 2026

• 07:11 UTCGuardian-measuredResolvedAPI: Unreachable · resolved after 13m

Jun 23, 2026

• 08:51 UTCGuardian-measuredResolvedAPI: Unreachable · resolved after 9m
• 08:36 UTCGuardian-measuredResolvedAPI: Unreachable · resolved after 8m
• 04:26 UTCGuardian-measuredResolvedAPI: Unreachable · resolved after 4m
• 03:31 UTCGuardian-measuredResolvedAPI: Unreachable · resolved after 3m
• 03:16 UTCGuardian-measuredResolvedAPI: Unreachable · resolved after 3m

Jun 20, 2026

• 08:46 UTCGuardian-measuredResolvedAPI: Unreachable · resolved after 4m
• 08:31 UTCGuardian-measuredResolvedAPI: Unreachable · resolved after 3m
• 07:51 UTCGuardian-measuredResolvedAPI: Unreachable · resolved after 3m

Recent changes

• 2026-07-08Breaking changeType changed from object to unknown
• 2026-07-07Breaking changeType changed from object to unknown
• 2026-07-06Breaking changeType changed from object to unknown
• 2026-07-03Breaking changeType changed from object to unknown
• 2026-07-02Breaking changeType changed from object to unknown
• 2026-07-01Breaking change17 fields changed: message.items[].ISBN, message.items[].isbn-type, message.items[].publisher-location, +14 more
• 2026-07-01Breaking changeType changed from object to unknown
• 2026-06-30Breaking change17 fields changed: message.items[].ISBN, message.items[].isbn-type, message.items[].publisher-location, +14 more
• 2026-06-30Breaking changeType changed from object to unknown
• 2026-06-26Breaking changeType changed from object to unknown
• 2026-06-25Breaking changeType changed from object to unknown
• 2026-06-24Breaking changeType changed from object to unknown

Integrate

The live status, 90-day uptime figure and change history on this page are also machine-readable: embed the badge, poll the JSON, or subscribe to the feed. No key needed.

Status badge:

Markdown embed: [![Crossref API status](https://guardiandev.ai/apis/crossref-api/badge.svg)](https://guardiandev.ai/apis/crossref-api)

Machine-readable: JSON (versioned v1, CORS-enabled) · Atom feed of drift & outage events.