OpenAlex
FreemiumLiveLast verified 24 Sept 2026
Open index of 250M+ scholarly works, authors, institutions, journals and research topics.
Example request
curl -s 'https://api.openalex.org/works/W2741809807'
Free tier, in plain English
No key needed and no cost for normal use, capped at 100,000 credits and 100 requests per second a day; paid plans exist for much higher daily budgets.
Alternatives in Academic
arXivSearches and retrieves metadata for millions of physics, math, CS and related research preprints.FreeCollege ROI30-year net present value and lifetime ROI for 500 US colleges and 134 majors, from IPEDS/FREOPP/BEA data.FreeCORESearch and metadata for 200M+ open-access research papers aggregated from repositories worldwide.FreemiumCrossref Metadata SearchSearch and fetch metadata for scholarly works by DOI, title, author, funder, or journal.FreemiumEPO Open Patent ServicesSearch European and worldwide patent bibliographic, full-text and legal-status data from the EPO.Free