Crossref REST API
Lookup DOI metadata, references, and funding for over 150 million scholarly works.
Crossref REST API is listed in Government & Science.
Auth No auth Pricing Free URL https://www.crossref.org/ Docs https://api.crossref.org/swagger-ui/index.html
Key metrics
50 req/sec Rate limit Free and keyless; the public pool is fair-use, and adding a mailto for the polite pool grants ~50 requests/second.
Gotchas
No gotchas documented yet. Contribute one if you know a constraint we missed.
Labels
- No auth
No auth
Callable with no API key or login — lowest-friction to integrate.
doi metadata citations publishing academic