OpenAlex
Free, open catalog of 250+ million scholarly works (papers, theses, books) with authors, citations, institutions, and to
Browse our collection of free Academic APIs. Each API includes detailed documentation, example requests, and usage guides. Click on any API to learn more.
arXiv
Free API to search 2.5+ million scholarly papers across physics, math, computer science, and more. Returns paper metadat
Crossref
Scholarly metadata and DOI lookup