Crossref Data API

Crossref is the world's largest scholarly metadata infrastructure — a not-for-profit membership organization maintaining DOI registration and structured bibliographic records for over 183.7 million works: journal articles, conference papers, books, book chapters, datasets, reports, and preprints. Its members include every major academic publisher: Elsevier, Wiley, Springer Nature, Taylor & Francis, the ACM, the APA, and thousands more. The result is the most comprehensive, publisher-authoritative index of scholarly output in existence.

The raw Crossref REST API is free to query but imposes rate limits, requires careful pagination, and returns deeply nested JSON that varies by work type. Anysite's Crossref integration resolves DOIs, executes rich searches, enumerates journals and publishers, and surfaces funder portfolios through a unified, authenticated endpoint surface — one API key, consistent JSON structure, and predictable rate limits across all 12 endpoints. For research tools, literature discovery pipelines, citation dashboards, and funder-tracking applications, this is the fastest path from DOI to structured data.

Twelve endpoints covering scholarly works, journals, publishers, funders, and DOI prefix resolution. All return structured JSON via the Anysite REST API at /api/crossref/....

Authenticate with your Anysite API key. All Crossref endpoints accept POST with a JSON body and return structured JSON.

# Resolve a DOI to full scholarly metadata
curl -X POST https://api.anysite.io/api/crossref/works   -H "access-token: YOUR_KEY"   -H "Content-Type: application/json"   -d '{"doi": "10.1145/3292500.3330701"}'

# Returns: title, authors (with ORCID), abstract, journal,
# publisher, dates, citation count, funders, references

# Search works with filters — author, date, has abstract
curl -X POST https://api.anysite.io/api/crossref/works/search   -H "access-token: YOUR_KEY"   -H "Content-Type: application/json"   -d '{
    "title": "large language models",
    "from_pub_date": "2023",
    "has_abstract": true,
    "sort": "published",
    "order": "desc",
    "count": 20
  }'

# Returns: array of 20 most recently published papers
# on LLMs with abstracts, sorted newest first

# Find NSF (funder_id 100000001) funded works
curl -X POST https://api.anysite.io/api/crossref/funders/works   -H "access-token: YOUR_KEY"   -H "Content-Type: application/json"   -d '{"funder_id": "100000001", "count": 10}'

# Returns: 10 works funded by NSF, with grant awards,
# DOIs, authors, journals, and publication dates

Every endpoint is included in all Anysite plans — there's no per-endpoint pricing to track. Use MCP Unlimited for flat-rate access through your AI tools, or a credit plan for REST & CLI at scale.