# United States National Library of Medicine

**Canonical:** https://apis.io/providers/united-states-national-library-of-medicine/  
**Website:** https://www.ncbi.nlm.nih.gov/home/develop/api/  
**APIs profiled:** 10

The United States National Library of Medicine (NLM) is the world's largest biomedical library. It serves as a vital resource for researchers, healthcare professionals, and the general public by providing access to a vast collection of biomedical literature and resources. The NLM offers a wide range of services and resources including online databases, digital archives, and research tools that support medical research, education, and patient care. Key APIs include the NCBI E-Utilities (PubMed, Entrez), NCBI Datasets (genomes, genes), BLAST sequence alignment, and the ClinicalTrials.gov API.

## Kin Score — 34.4 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 34.4).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 58.0 |
| Governance | 30.3 |
| Contract Governance | 30.3 |
| Operational Transparency | 7.9 |
| Developer Ergonomics | 21.4 |
| Commercial Clarity | 15.8 |
| Access Clarity | 15.8 |

Regulatory layer — **Health**: 21.3 (matched via tags).

## Agent readiness — 35.0 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | verified |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (10)

- **United States National Library of Medicine BLAST API** — BLAST sequence search submission and retrieval
- **United States National Library of Medicine Fetch API** — Retrieve records from Entrez databases
- **United States National Library of Medicine Gene API** — Gene records and sequence data
- **United States National Library of Medicine Genome API** — Genome assembly data and metadata
- **United States National Library of Medicine Info API** — Database information and statistics
- **United States National Library of Medicine Link API** — Find linked records across databases
- **United States National Library of Medicine Metadata API** — API metadata and field definitions
- **United States National Library of Medicine Search API** — Search Entrez databases
- **United States National Library of Medicine Studies API** — Clinical trial study search and retrieval
- **United States National Library of Medicine Taxonomy API** — NCBI taxonomy information

## Agentic access (1)

- **United States National Library Of Medicine Agentic Access** — 17 operations · 1 acting

## Security (2)

- **United States National Library Of Medicine Authentication** — apiKey · 1 scheme
- **United States National Library Of Medicine Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC

## Plans (1)

- **United States National Library Of Medicine Plans Pricing**

## Tags

Federal-Government, Biomedical Research, Healthcare, Genomics, Literature

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/united-states-national-library-of-medicine/). Scores are computed from the provider's own public artifacts under a published rubric.