oanor
Sign up free
Marketplace Pricing Features Sign in

API · /crossref-api

Crossref API

healthy 3,419 Subscribers

Search scholarly literature and look up rich publication metadata from Crossref, the DOI registry behind millions of journal articles, books, chapters, conference papers and datasets. Full-text search across 150+ million works with relevance or citation sorting and optional filters, retrieve any work by its DOI (plain, doi: or URL form accepted), and search journals and publishers. Every work comes back as a clean record with title, authors and ORCIDs, journal/container, publisher, publication date, volume/issue/page, ISSN/ISBN, abstract, subjects, license and citation count. Authoritative open scholarly metadata delivered through a fast, reliable API — ideal for reference managers, repositories, research analytics, discovery tools and academic apps.

#crossref #academic #research #doi #papers #citations
api.oanor.com/crossref-api
Get an API key Try in playground → Contact provider

Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
769 ms
Server probes · 24h
Subscribers
3,419
active
Total calls
16
last 7 days
status Full status page → · 15 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 1,000 calls / month
  • 1 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,000 requests/month, 1 req/s
  • Works search, by-DOI, journals & members
  • 150M+ scholarly records
  • No credit card
Sign in to subscribe

Basic

€7.00 /month

  • 50,000 calls / month
  • 5 requests / second
  • Hard cap (429 above quota, no overage)
  • 50,000 requests/month, 5 req/s
  • Relevance & citation sorting, filters
  • Authors, ORCIDs, abstracts & citation counts
  • Commercial use, email support
Sign in to subscribe

Pro

€19.00 /month

  • 300,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 300,000 requests/month, 15 req/s
  • High-volume discovery & analytics
  • Polite-pool throughput
  • Priority email support
Sign in to subscribe

Mega

€59.00 /month

  • 2,000,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 2,000,000 requests/month, 40 req/s
  • Repository & research-platform scale
  • Maximum concurrency
  • Priority support
Sign in to subscribe

Built by

P
PremiumApi

Related APIs

Other APIs with overlapping tags.

PubMed API

Search the world’s biomedical literature and retrieve clean article metadata and abstracts, powered by the U.S. National Library of Medicine’s PubMed via NCBI E-utilities. Search 35+ million citations by keyword with relevance or date sorting, look up one or more articles by PubMed id for title, authors, journal, publication date, volume/issue/pages, DOI and publication type, or fetch the full abstract text for a paper. Authoritative open data returned as tidy JSON through a fast, reliable API. Ideal for health-tech and clinical tools, pharma and life-sciences research, systematic reviews, reference managers and academic apps.

api.oanor.com/pubmed-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Crossref API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Crossref API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Crossref 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 Crossref API cost?
Crossref 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 Crossref API GDPR-compliant?
All requests to Crossref 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/crossref-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/crossref-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/crossref-api/SOME_PATH");
curl_setopt($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/crossref-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

Ratings

Sign in to rate.

No reviews yet.

Discussion

Ask questions, share usage tips, get answers from the provider and other developers. Public — anyone can read.

Sign in to start a thread or reply.

Sign in

New thread

/ 4000

📌 Pinned 🔒 Locked

·

· ·

/ 4000

🔒 This thread is locked — no new replies.

  • No threads yet — start the discussion.

Support

Private 1:1 support with the provider — billing questions, integration issues, account problems. Only you and the provider team can see these threads.

Sign in to open a support ticket.

Sign in

Open new ticket

Describe what you need help with. The provider team gets an email and replies on the ticket page.

  • No tickets yet for this API.

Subscription active — calls can start immediately.

Send your first request —

Subscription active — copy a snippet and fire off your first call.