National Institutes of Health
type: Organization
description: The US National Institutes of Health provides public REST APIs for biomedical research
has part: NCBI E-utilities (Entrez Programming Utilities)
has part: NCBI Datasets v2 REST API
has part: PubChem Power User Gateway (PUG REST)
has part: ClinicalTrials.gov REST API
has part: NIH RePORTER API
has part: NCBI BLAST URL API
has part: PubMed Central (PMC) OA API

NCBI E-utilities (Entrez Programming Utilities)
type: WebAPI
documentation: https://www.ncbi.nlm.nih.gov/books/NBK25500/
description: Programmatic access to all Entrez databases including PubMed, PMC, Gene, Nuccore, and Protein

NCBI Datasets v2 REST API
type: WebAPI
documentation: https://www.ncbi.nlm.nih.gov/datasets/docs/v2/api/rest-api/
description: Access to biological datasets including gene metadata, genome assemblies, taxonomy, and virus genomes

PubChem Power User Gateway (PUG REST)
type: WebAPI
documentation: https://pubchem.ncbi.nlm.nih.gov/pug_rest/PUG_REST.html
description: Programmatic access to PubChem chemical compound data and bioassay information

ClinicalTrials.gov REST API
type: WebAPI
documentation: https://clinicaltrials.gov/data-api/api
description: Access to federally and privately supported clinical studies data

NIH RePORTER API
type: WebAPI
documentation: https://api.reporter.nih.gov/
description: Programmatic access to NIH-funded research project data including grants and publications

NCBI BLAST URL API
type: WebAPI
documentation: https://ncbi.github.io/blast-cloud/dev/api.html
description: Submit BLAST sequence searches and retrieve alignment results

PubMed Central (PMC) OA API
type: WebAPI
documentation: https://pmc.ncbi.nlm.nih.gov/tools/developers/
description: Access to PubMed Central Open Access content and ID conversion