APIs for Scholarly Resources

Provides free, programmatic access to the Unpaywall.org database that contains open access contents from over 50,000 publishers and repositories.

Requirements

Requests must include your email as a parameter at the end of the URL, like this: api.unpaywall.org/my/request?email=youremail@email.com

Return Format

The API return results in JSON format. The data schema is available here.

Limitations

• Limit use to 100,000 calls per day.
• If you need to work with a larger dataset, Unpaywall recommends downloading the entire database snapshot for faster local access.  

Useful Links

• Documentation
• Unpaywall database snapshot
• Database snapshot access request form
• Response data schema
• roadoi (R) - R package for Unpaywall API