Over the past two weeks, I have been documenting every free API I could find for academic research and data collection.
Here is what I have so far:
Paper Search
- OpenAlex — 250M+ works, no key
- CORE — 260M+ papers, 36M full-text
- Semantic Scholar — 200M+ with AI recommendations
- Crossref — 150M+ DOIs, citation counts
- PubMed — 35M+ biomedical papers
- Europe PMC — 40M+ with full text
- DBLP — 6.5M+ CS papers
- arXiv — 2M+ preprints
- Unpaywall — Find free versions of paywalled papers
- ORCID — 18M+ researcher profiles
Data & Statistics
- World Bank — GDP, population, 16K+ indicators
- FRED — 800K+ US economic series
- Eurostat — EU statistics
- data.gov — US government datasets
Science
- NASA — 20+ APIs (Mars, asteroids, exoplanets)
- GBIF — 2B+ biodiversity records
- GenBank — Genomic data
- USPTO — 12M+ patents
Security
- NVD — 250K+ CVEs
- VirusTotal — Malware scanning
- Shodan — Internet device search
- crt.sh — SSL certificates
Full list with tutorials: Awesome Research APIs
My question: What free APIs am I missing?
Specifically looking for:
- APIs for social science research
- Climate/weather data APIs
- Linguistics/NLP dataset APIs
- Government transparency APIs
- Any API you use for research that others might not know about
I will add every suggestion to the list with a tutorial.
What is YOUR go-to free API?\n\n---\n\n## More Free Research APIs\n\nThis is part of my series on free APIs for researchers and data scientists:\n\n- OpenAlex API — 250M+ Academic Works\n- CORE API — 260M+ Scientific Papers\n- Crossref API — DOI Metadata for 150M+ Papers\n- Unpaywall API — Find Free Paper Versions\n- Europe PMC — 40M+ Biomedical Papers\n- World Bank API — GDP & Economic Data\n- ORCID API — 18M+ Researcher Profiles\n- DBLP API — 6M+ CS Publications\n- NASA APIs — 20+ Free Space Data APIs\n- FRED API — 800K+ US Economic Time Series\n- All 30+ Research APIs Mapped\n\n*Tools: Academic Research Toolkit on GitHub*
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