I Mapped 30+ Free Research APIs — What Am I Missing?

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? Sp