Crossref API
Science & Math · Operational · 30d uptime 100%
Crossref API: metadata for 150M+ scholarly works including DOIs, citation counts, funding info, licenses, and journal metrics.
Trust signals
Pricing
FREE
Auth
UNKNOWN
CORS
Yes
Rate limit
Pols with polite pool; 50 requests/second with polite pool
Health
612ms
Trust score
86 (B)
Last checked Sep 4, 2026 · uptime 24h 100% / 7d 100% / 30d 100%
Strong candidate; weakest signal is OpenAPI availability.
Links
- Homepagewww.crossref.org
- Documentationapi.crossref.org/swagger-ui/index.html
- Base URLapi.crossref.org/swagger-ui/index.html
Integration checklist
- Auth is UNKNOWN— no credit card required
- CORS enabled — callable directly from browsers.
- Rate limit: Pols with polite pool; 50 requests/second with polite pool