PubMed · Pricing Plans

Entrez Eutils

NCBI E-utilities and PubMed APIs are free public services provided by the National Library of Medicine (NLM), a branch of the U.S. National Institutes of Health. There are no paid tiers or subscription plans. Access is differentiated by whether an API key is used, which affects rate limits.

Entrez Eutils is the machine-readable pricing-plan profile for PubMed on the APIs.io network, conforming to the API Commons Plans specification.

It defines 2 plans, with named plans including Anonymous / No API Key, Registered API Key.

Tagged areas include Biomedical, Life Science, Research, Literature, and Citations.

2 Plans
View Source
BiomedicalLife ScienceResearchLiteratureCitationsAbstractsMeshGenomicsPubMedNCBI

Plans

Anonymous / No API Key

Free access without registration. Limited to 3 API requests per second from a single IP address. Suitable for light, ad-hoc use and evaluation.

Registered API Key

Free access with an NCBI API key obtained through a free NCBI account. Raises the rate limit to 10 requests per second. Required for production applications and automated systems that need higher throughput. Higher rates available upon request for special use cases.

Work with this as data

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

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Tools for plans

4 MCP tools reach this
  • find_plansBrowse and filter every plan in the catalog.
  • 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.
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Call it yourself

curl for this page
This plan 
curl "https://apis.io/api/v1/plans/entrez-eutils"
All plans 
curl "https://apis.io/api/v1/plans?limit=25"

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