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API · /europepmc-api

Europe PMC API

healthy 3,047 Subscribers

Europe PMC as an API, powered by EMBL-EBI — an open repository of biomedical and life-sciences literature covering 45 million+ abstracts and 9 million+ full-text articles drawn from PubMed, PubMed Central, preprint servers (bioRxiv and medRxiv), patents and Agricola. Search the literature with rich field syntax (by author, title, journal, MeSH term, publication year or open-access status), ordering results by relevance, date or citation count, and optionally restricting to preprints only; read an article's full metadata and abstract — its authors, journal, volume and pages, DOI, PubMed and PMC identifiers, MeSH terms, keywords, funding grants and links to the free full text; and walk the citation network in both directions: the articles that cite a given paper, and the works that paper itself references. Together these let you measure scholarly impact, build citation graphs, track a research topic across preprints and peer-reviewed papers, and feed evidence into bibliometric, systematic-review and research-intelligence tools. Article identifiers are PubMed ids (numeric), PMC ids (PMC…) or preprint ids (PPR…); the source defaults to PubMed (MED). Data from EMBL-EBI Europe PMC.

#europe-pmc #literature #citations #biomedical #research #life-sciences #bibliometrics
api.oanor.com/europepmc-api
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Machine-readable spec so AI agents can integrate this API.

/api/europepmc-api/openapi.json
/api/europepmc-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
216 ms
Server probes · 24h
Subscribers
3,047
active
Total calls
15
last 7 days
status Full status page → · 35 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 500 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 500 calls/month
  • 2 req/sec
  • Search, article & citation lookup
  • No credit card
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Starter

€7.00 /month

  • 20,000 calls / month
  • 6 requests / second
  • Hard cap (429 above quota, no overage)
  • 20k calls/month
  • 6 req/sec
  • Citation network access
  • Email support
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Pro

€22.00 /month

  • 95,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 95k calls/month
  • 15 req/sec
  • Bibliometrics & reviews
  • Priority support
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Mega

€60.00 /month

  • 400,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 400k calls/month
  • 40 req/sec
  • High-throughput research intel
  • Dedicated SLA
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Scholarly citations as open data — powered by OpenCitations (COCI), the open citation index. Unlike a metadata lookup, OpenCitations treats every citation as a first-class object: given a DOI you can list the papers that cite it (incoming citations) and the papers it references (outgoing), each annotated with its OpenCitations Identifier (OCI), the date the citation was created, the timespan between the two works, and whether it is a journal- or author-self-citation. Plus quick citation and reference counts for any DOI. It is built for citation-network and bibliometric work — research-impact analysis, self-citation detection, citation-timespan studies and science mapping — and is distinct from scholarly-metadata services (Crossref, OpenAlex). From a single paper to a whole reference graph, ideal for bibliometrics, research-analytics and reference-management tools. Open data from OpenCitations (CC0).

api.oanor.com/opencitations-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Europe PMC API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Europe PMC API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Europe PMC API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Europe PMC API cost?
Europe PMC API has a free tier with 100 calls / month. Paid plans start at €7.00 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Europe PMC API GDPR-compliant?
All requests to Europe PMC API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/europepmc-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/europepmc-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/europepmc-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/europepmc-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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