# Research APIs on Apizie

> Papers, citations and academic databases. 8 APIs, 62 endpoints, one API key.

- [PubMed](https://apizie.tech/api/research/pubmed) `research:pubmed`: 22 endpoints, live. Biomedical literature through NCBI E-utilities, plus PubTator3 annotations, iCite metrics, NCBI gene reports and ClinicalTrials.gov.
- [DOAJ](https://apizie.tech/api/research/doaj) `research:doaj`: 13 endpoints, live. Open-access journals and articles indexed by the Directory of Open Access Journals (public API + OAI-PMH).
- [Europe PMC](https://apizie.tech/api/research/europepmc) `research:europepmc`: 11 endpoints, live. Life-science literature, citations, references, cross-links, full text and text-mined annotations from the Europe PMC REST APIs.
- [OpenAlex](https://apizie.tech/api/research/openalex) `research:openalex`: 5 endpoints, live. An open index of 250M+ scholarly works, authors, institutions and topics.
- [Crossref](https://apizie.tech/api/research/crossref) `research:crossref`: 3 endpoints, live. Metadata for 160M+ DOIs: journal articles, books, conference papers and their references.
- [GBIF](https://apizie.tech/api/research/gbif) `research:gbif`: 3 endpoints, live. Global Biodiversity Information Facility: 2.7 billion species occurrence records and the backbone taxonomy.
- [Semantic Scholar](https://apizie.tech/api/research/semantic-scholar) `research:semantic-scholar`: 3 endpoints, live. AI-powered academic search from Ai2: papers, authors, citations and TLDR summaries.
- [iNaturalist](https://apizie.tech/api/research/inaturalist) `research:inaturalist`: 2 endpoints, live. Citizen-science observations of plants and animals with photos and identifications.