National Institutes of Health (NIH)

The US National Institutes of Health (NIH) provides a suite of public REST APIs for biomedical research, including PubMed literature search via E-utilities, ClinicalTrials.gov clinical trial data, chemical compound data through PubChem, gene and genome databases via NCBI Datasets, BLAST sequence alignment, and NIH research funding data through RePORTER.

National Institutes of Health (NIH) publishes 15 API contracts indexed on the APIs.io network, including BioSample API, Gene API, Genome API, and 12 more. Tagged areas include Biomedical, Research, PubMed, Clinical Trials, and PubChem.

The National Institutes of Health (NIH) catalog on APIs.io includes 2 JSON-LD contexts and 1 Spectral governance ruleset.

National Institutes of Health (NIH)’s developer surface includes authentication, documentation, engineering blog, pricing, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

32.1/100 thin ▬ flat Agent 27/100 agent aware Front door AI 1/6 silent Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreeSelf serve⚡ Free to try

2 published contracts

Biomedical Research PubMed Clinical TrialsPubChemGenomics Health Science Government

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Clinical Trials Management

BC-1520

Studies

GET /studies GET /studies/{nctId}

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 32.1/100 · thin

Contract Quality 10.2 / 19

Developer Ergonomics 3.6 / 15

Access Clarity 2.8 / 15

Operational Transparency 2.1 / 10

Contract Governance 0.9 / 9

Discoverability 5.0 / 8

Regulatory Posture 2.0 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 27/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 0 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Health regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 18.4 — up to +16.3 composite points
Developer Ergonomics scores 23.8 — up to +15.2 composite points
Contract Quality scores 54.6 — up to +11.4 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/nih/apis.yml: open an issue on github.com/api-evangelist/nih to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Life Sciences (Biotech and Pharma R&D)	standard	17.2 (thin)	-	-
US Federal API Programs (api.data.gov, Login.gov, GSA MAS, FedRAMP)	standard	17.2 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 15

Individual APIs this provider publishes, each with its own machine-readable definition.

NCBI E-utilities (Entrez Programming Utilities)

The public API to the NCBI Entrez system providing programmatic access to all Entrez databases including PubMed, PMC, Gene, Nuccore, and Protein. Supports searching, fetching, l...

PubChem Power User Gateway (PUG REST)

Suite of REST APIs providing programmatic access to PubChem chemical compound data, including chemical structure searches, compound properties, biological assay data, and chemic...

NIH RePORTER API

REST API providing programmatic access to NIH-funded research project data including grants, contracts, publications, and patents. Enables search and retrieval of funding record...

NCBI BLAST URL API

API enabling developers to submit BLAST (Basic Local Alignment Search Tool) sequence searches via HTTPS for processing at NCBI or cloud service providers, check job status, and ...

PubMed Central (PMC) OA API

APIs for programmatic access to PubMed Central's Open Access content, including file validation, Open Access service, and an ID converter for translating between PMCID, PMID, Ma...

National Institutes of Health (NIH) BioSample API

#### Options to download BioSample data. This BioSample service allows you to get BioSample data as a data report.

National Institutes of Health (NIH) Gene API

#### Options to download gene data, including the associated sequence and metadata. These gene services allow you to get gene metadata as a data report or download gene, transcr...

National Institutes of Health (NIH) Genome API

#### Options to download assembled genome data, including the associated sequence, annotation and metadata. These genome services allow you to get genome metadata as a data repo...

National Institutes of Health (NIH) Organelle API

#### Options to download RefSeq organelle genome data, including the associated sequence and metadata. These organelle services allow you to get RefSeq organelle genome metadata...

National Institutes of Health (NIH) Prokaryote API

#### Options to download prokaryote gene data, including the associated sequence and metadata. These gene services allow you to download gene and protein sequence, and metadata ...

National Institutes of Health (NIH) Stats API

Data statistics

National Institutes of Health (NIH) Studies API

Related to clinical trial studies

National Institutes of Health (NIH) Taxonomy API

#### Options to download taxonomy data. These taxonomy services allow you to get taxonomy data as a data report or download taxonomy data as a taxonomy data package, for taxonom...

National Institutes of Health (NIH) Version API

Version info

National Institutes of Health (NIH) Virus API

#### Options to download virus genome data, including the associated sequence and metadata. These virus services allow you to get virus genome metadata as a data report or downl...

National Institutes of Health (NIH) API pricing

Not yet checked against National Institutes of Health (NIH)'s own pricing page. Compiled by API Evangelist on 2026-06-13; confirm before you rely on a figure.

Plan	Price
Anonymous / No Key	—
Registered API Key	—
Enhanced API Key (High Volume)	—
PubChem Access	—
NIH RePORTER Access	—

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Nih Plans Pricing

5 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Nih Rate Limits

0 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

National Institutes of Health (NIH)

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Nih Finops

FINOPS

5 fields

EXAMPLE

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Nih Authentication

apiKey · 2 schemes

SECURITY

Nih Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Nih Agentic Access

115 operations · 5 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrg

GitHubOrg

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: nih
name: National Institutes of Health (NIH)
description: The US National Institutes of Health (NIH) provides a suite of public REST APIs for biomedical research, including
  PubMed literature search via E-utilities, ClinicalTrials.gov clinical trial data, chemical compound data through PubChem,
  gene and genome databases via NCBI Datasets, BLAST sequence alignment, and NIH research funding data through RePORTER.
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: free
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Free · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/nih.png
url: https://raw.githubusercontent.com/api-evangelist/nih/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.23'
tags:
- Biomedical
- Research
- PubMed
- Clinical Trials
- PubChem
- Genomics
- Health
- Science
- Government
tags_raw:
- Biomedical
- Research
- PubMed
- ClinicalTrials
- PubChem
- Genomics
- Health
- Science
- Government
apis:
- name: NCBI E-utilities (Entrez Programming Utilities)
  description: The public API to the NCBI Entrez system providing programmatic access to all Entrez databases including PubMed,
    PMC, Gene, Nuccore, and Protein. Supports searching, fetching, linking, and summarizing records across 38+ databases.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.ncbi.nlm.nih.gov/home/develop/api/
  baseURL: https://eutils.ncbi.nlm.nih.gov/entrez/eutils/
  tags:
  - PubMed
  - Literature
  - Genomics
  - Entrez
  properties:
  - type: Documentation
    url: https://www.ncbi.nlm.nih.gov/books/NBK25500/
  contact:
  - FN: NCBI
    email: info@ncbi.nlm.nih.gov
- name: PubChem Power User Gateway (PUG REST)
  description: Suite of REST APIs providing programmatic access to PubChem chemical compound data, including chemical structure
    searches, compound properties, biological assay data, and chemical standardization for millions of compounds.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://pubchem.ncbi.nlm.nih.gov/docs/programmatic-access
  baseURL: https://pubchem.ncbi.nlm.nih.gov/rest/pug/
  tags:
  - Chemistry
  - Chemical Data
  - PubChem
  - Compounds
  - Bioassay
  properties:
  - type: Documentation
    url: https://pubchem.ncbi.nlm.nih.gov/docs/programmatic-access
  - type: Documentation
    url: https://pubchem.ncbi.nlm.nih.gov/pug_rest/PUG_REST.html
  contact:
  - FN: PubChem
    url: https://pubchemdocs.ncbi.nlm.nih.gov/contact
- name: NIH RePORTER API
  description: REST API providing programmatic access to NIH-funded research project data including grants, contracts, publications,
    and patents. Enables search and retrieval of funding records with extensive filtering by institute, mechanism, fiscal
    year, and keywords.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://reporter.nih.gov/
  baseURL: https://api.reporter.nih.gov/v2/
  tags:
  - Research Funding
  - Grants
  - Publications
  - NIH Projects
  properties:
  - type: Documentation
    url: https://api.reporter.nih.gov/
  contact:
  - FN: NIH RePORTER
    url: https://reporter.nih.gov/
- name: NCBI BLAST URL API
  description: API enabling developers to submit BLAST (Basic Local Alignment Search Tool) sequence searches via HTTPS for
    processing at NCBI or cloud service providers, check job status, and retrieve results in multiple formats for sequence
    similarity analysis.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://blast.ncbi.nlm.nih.gov/Blast.cgi?CMD=Web&PAGE_TYPE=BlastDocs&DOC_TYPE=DeveloperInfo
  baseURL: https://blast.ncbi.nlm.nih.gov/blast/Blast.cgi
  tags:
  - BLAST
  - Sequence Alignment
  - Genomics
  - Bioinformatics
  properties:
  - type: Documentation
    url: https://ncbi.github.io/blast-cloud/dev/api.html
  contact:
  - FN: NCBI
    email: info@ncbi.nlm.nih.gov
- name: PubMed Central (PMC) OA API
  description: APIs for programmatic access to PubMed Central's Open Access content, including file validation, Open Access
    service, and an ID converter for translating between PMCID, PMID, Manuscript ID, and DOI identifiers.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://pmc.ncbi.nlm.nih.gov/tools/developers/
  baseURL: https://www.ncbi.nlm.nih.gov/pmc/
  tags:
  - PubMed Central
  - Open Access
  - Publications
  - Literature
  properties:
  - type: Documentation
    url: https://pmc.ncbi.nlm.nih.gov/tools/developers/
  contact:
  - FN: PMC
    url: https://pmc.ncbi.nlm.nih.gov/
- aid: nih:nih-biosample-api
  name: National Institutes of Health (NIH) BioSample API
  description: '#### Options to download BioSample data.

    This BioSample service allows you to get BioSample data as a data report.'
  humanURL: https://www.ncbi.nlm.nih.gov/home/develop/api/
  baseURL: https://eutils.ncbi.nlm.nih.gov/entrez/eutils/
  tags:
  - BioSample
  properties:
  - type: OpenAPI
    url: openapi/nih-biosample-api-openapi.yml
  - type: Documentation
    url: https://www.ncbi.nlm.nih.gov/datasets/docs/v2/api/rest-api/
  - type: Documentation
    url: https://clinicaltrials.gov/data-api/api
- aid: nih:nih-gene-api
  name: National Institutes of Health (NIH) Gene API
  description: '#### Options to download gene data, including the associated sequence and metadata.

    These gene services allow you to get gene metadata as a data report or download gene, transcript and protein sequence,
    and metadata, as a gene data package, for all genes in NCBI Gene.'
  humanURL: https://www.ncbi.nlm.nih.gov/home/develop/api/
  baseURL: https://eutils.ncbi.nlm.nih.gov/entrez/eutils/
  tags:
  - Gene
  properties:
  - type: OpenAPI
    url: openapi/nih-gene-api-openapi.yml
  - type: Documentation
    url: https://www.ncbi.nlm.nih.gov/datasets/docs/v2/api/rest-api/
  - type: Documentation
    url: https://clinicaltrials.gov/data-api/api
- aid: nih:nih-genome-api
  name: National Institutes of Health (NIH) Genome API
  description: '#### Options to download assembled genome data, including the associated sequence, annotation and metadata.

    These genome services allow you to get genome metadata as a data report or download genome, transcript and protein sequence,
    annotation and metadata as a genome data package, for assembled genomes.'
  humanURL: https://www.ncbi.nlm.nih.gov/home/develop/api/
  baseURL: https://eutils.ncbi.nlm.nih.gov/entrez/eutils/
  tags:
  - Genome
  properties:
  - type: OpenAPI
    url: openapi/nih-genome-api-openapi.yml
  - type: Documentation
    url: https://www.ncbi.nlm.nih.gov/datasets/docs/v2/api/rest-api/
  - type: Documentation
    url: https://clinicaltrials.gov/data-api/api
- aid: nih:nih-organelle-api
  name: National Institutes of Health (NIH) Organelle API
  description: '#### Options to download RefSeq organelle genome data, including the associated sequence and metadata.

    These organelle services allow you to get RefSeq organelle genome metadata as a data report or download gene, transcript
    and protein sequence, and metadata, as an organelle data package, for RefSeq organelle genomes.'
  humanURL: https://www.ncbi.nlm.nih.gov/home/develop/api/
  baseURL: https://eutils.ncbi.nlm.nih.gov/entrez/eutils/
  tags:
  - Organelle
  properties:
  - type: OpenAPI
    url: openapi/nih-organelle-api-openapi.yml
  - type: Documentation
    url: https://www.ncbi.nlm.nih.gov/datasets/docs/v2/api/rest-api/
  - type: Documentation
    url: https://clinicaltrials.gov/data-api/api
- aid: nih:nih-prokaryote-api
  name: National Institutes of Health (NIH) Prokaryote API
  description: '#### Options to download prokaryote gene data, including the associated sequence and metadata.

    These gene services allow you to download gene and protein sequence, and metadata as a prokaryote gene data package, for
    prokaryotic [RefSeq non-redundant proteins](https://www.ncbi.nlm.nih.gov/refseq/about/nonredundantproteins/).'
  humanURL: https://www.ncbi.nlm.nih.gov/home/develop/api/
  baseURL: https://eutils.ncbi.nlm.nih.gov/entrez/eutils/
  tags:
  - Prokaryote
  properties:
  - type: OpenAPI
    url: openapi/nih-prokaryote-api-openapi.yml
  - type: Documentation
    url: https://www.ncbi.nlm.nih.gov/datasets/docs/v2/api/rest-api/
  - type: Documentation
    url: https://clinicaltrials.gov/data-api/api
- aid: nih:nih-stats-api
  name: National Institutes of Health (NIH) Stats API
  description: Data statistics
  humanURL: https://www.ncbi.nlm.nih.gov/home/develop/api/
  baseURL: https://eutils.ncbi.nlm.nih.gov/entrez/eutils/
  tags:
  - Stats
  properties:
  - type: OpenAPI
    url: openapi/nih-stats-api-openapi.yml
  - type: Documentation
    url: https://www.ncbi.nlm.nih.gov/datasets/docs/v2/api/rest-api/
  - type: Documentation
    url: https://clinicaltrials.gov/data-api/api
- aid: nih:nih-studies-api
  name: National Institutes of Health (NIH) Studies API
  description: Related to clinical trial studies
  humanURL: https://www.ncbi.nlm.nih.gov/home/develop/api/
  baseURL: https://eutils.ncbi.nlm.nih.gov/entrez/eutils/
  tags:
  - Studies
  properties:
  - type: OpenAPI
    url: openapi/nih-studies-api-openapi.yml
  - type: Documentation
    url: https://www.ncbi.nlm.nih.gov/datasets/docs/v2/api/rest-api/
  - type: Documentation
    url: https://clinicaltrials.gov/data-api/api
- aid: nih:nih-taxonomy-api
  name: National Institutes of Health (NIH) Taxonomy API
  description: '#### Options to download taxonomy data.

    These taxonomy services allow you to get taxonomy data as a data report or download taxonomy data as a taxonomy data package,
    for taxonomic nodes in NCBI Taxonomy.'
  humanURL: https://www.ncbi.nlm.nih.gov/home/develop/api/
  baseURL: https://eutils.ncbi.nlm.nih.gov/entrez/eutils/
  tags:
  - Taxonomy
  properties:
  - type: OpenAPI
    url: openapi/nih-taxonomy-api-openapi.yml
  - type: Documentation
    url: https://www.ncbi.nlm.nih.gov/datasets/docs/v2/api/rest-api/
  - type: Documentation
    url: https://clinicaltrials.gov/data-api/api
- aid: nih:nih-version-api
  name: National Institutes of Health (NIH) Version API
  description: Version info
  humanURL: https://www.ncbi.nlm.nih.gov/home/develop/api/
  baseURL: https://eutils.ncbi.nlm.nih.gov/entrez/eutils/
  tags:
  - Version
  properties:
  - type: OpenAPI
    url: openapi/nih-version-api-openapi.yml
  - type: Documentation
    url: https://www.ncbi.nlm.nih.gov/datasets/docs/v2/api/rest-api/
  - type: Documentation
    url: https://clinicaltrials.gov/data-api/api
- aid: nih:nih-virus-api
  name: National Institutes of Health (NIH) Virus API
  description: '#### Options to download virus genome data, including the associated sequence and metadata.

    These virus services allow you to get virus genome metadata as a data report or download genome and protein sequence,
    and metadata, as a virus data package, for virus GenBank genomes.'
  humanURL: https://www.ncbi.nlm.nih.gov/home/develop/api/
  baseURL: https://eutils.ncbi.nlm.nih.gov/entrez/eutils/
  tags:
  - Virus
  properties:
  - type: OpenAPI
    url: openapi/nih-virus-api-openapi.yml
  - type: Documentation
    url: https://www.ncbi.nlm.nih.gov/datasets/docs/v2/api/rest-api/
  - type: Documentation
    url: https://clinicaltrials.gov/data-api/api
common:
- type: CapabilityMap
  url: capabilities/nih-capability-edges.yml
  name: National Institutes of Health (NIH) Business Capability Map
- type: AgenticAccess
  url: agentic-access/nih-agentic-access.yml
- type: DomainSecurity
  url: security/nih-domain-security.yml
- type: Authentication
  url: authentication/nih-authentication.yml
- type: Website
  url: https://www.nih.gov/
- type: Documentation
  url: https://www.ncbi.nlm.nih.gov/home/develop/api/
- type: GitHubOrg
  url: https://github.com/ncbi
- type: LinkedIn
  url: https://www.linkedin.com/company/national-institutes-of-health
- type: Blog
  url: https://ncbiinsights.ncbi.nlm.nih.gov/
- type: Pricing
  url: https://www.ncbi.nlm.nih.gov/home/develop/api/
- type: StatusPage
  url: https://www.ncbi.nlm.nih.gov/home/develop/api/
- type: X
  url: https://x.com/NIH
- type: Plans
  url: plans/nih-plans-pricing.yml
- type: RateLimits
  url: rate-limits/nih-rate-limits.yml
- type: FinOps
  url: finops/nih-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

National Institutes of Health (NIH) API — frequently asked questions

Does National Institutes of Health (NIH) have an API?

Yes. APIs.io lists 15 APIs from National Institutes of Health (NIH), including NCBI E-utilities (Entrez Programming Utilities), PubChem Power User Gateway (PUG REST) and NIH RePORTER API, and 12 more.

Is there an OpenAPI specification for the National Institutes of Health (NIH) API?

Yes. APIs.io indexes 10 OpenAPI specifications for National Institutes of Health (NIH), each linked for download from this page.

How do I authenticate with the National Institutes of Health (NIH) API?

National Institutes of Health (NIH) uses bearer-token authentication (apiKey · 2 schemes). The details are profiled on APIs.io as Nih Authentication.

How much does the National Institutes of Health (NIH) API cost?

APIs.io lists 5 pricing plans for National Institutes of Health (NIH), with each plan's price, limits and inclusions under Pricing on this page.

Is the National Institutes of Health (NIH) API ready for AI agents?

National Institutes of Health (NIH) has a Kin Score of 32.1 out of 100 (thin) and an Agent Readiness score of 27.1 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/nih"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/nih/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/nih/evidence"

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A second provider on the same verified email joins the account you already have.