Individual skill
semantic-scholar-api
Search papers and analyze citation graphs via OpenAlex and CrossRef APIs
skills/literature/search/semantic-scholar-api/SKILL.md
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# OpenAlex & CrossRef API Guide
## Overview
OpenAlex is a free, open catalog of the global research system, indexing over 250 million academic works across all fields of science. It provides structured access to papers, authors, institutions, concepts, and citation networks. OpenAlex is the successor to Microsoft Academic Graph and is maintained by OurResearch (the team behind Unpaywall).
CrossRef is the official DOI registration agency for scholarly content, providing metadata for over 150 million DOIs across all publishers and disciplines. Together, OpenAlex and CrossRef provide comprehensive coverage for academic search, citation analysis, and bibliometric research.
Both APIs are free to use without authentication. OpenAlex requests a polite `User-Agent` header; CrossRef requests a `User-Agent` with contact email for access to the polite pool (faster rate limits).
## Authentication
No authentication is required for either API.