Do I need an API key?

No. The CrossRef API is fully public. Including a mailto address gets you into the "polite pool" with higher rate limits, which this server handles automatically.

A Digital Object Identifier (DOI) is a unique, permanent identifier assigned to academic publications, datasets, and other research outputs. Format: "10.1038/s41586-021-03819-2". CrossRef is the largest DOI registration agency with over 150 million registered DOIs.

Can I search by ORCID?

Yes. You can look up all works associated with a researcher's ORCID identifier. ORCID provides a unique, persistent identifier for researchers — similar to what DOI does for publications.

Stanford CrossRef MCP Connector for Claude

A+

Query scholarly metadata for millions of academic publications with DOI resolution, citation tracking, and publisher data.

16 tools Official Updated Jun 28, 2026 Official Vinkius Partner

More Details Connect to Claude

Connect to the CrossRef API — the authoritative source for DOI metadata and scholarly publishing infrastructure.

What you can do

DOI Resolution — Resolve any DOI to complete bibliographic metadata
Works Search — Search 150M+ DOI-registered works with advanced filters
Journal Registry — Query journals by title or ISSN with coverage metrics
Publisher Profiles — Explore academic publishers (Elsevier, Springer, Wiley)
Funder Registry — Search funding organizations (NIH, NSF, ERC, Wellcome Trust)
ORCID Lookup — Find works by researcher ORCID identifier
Affiliation Search — Search works by institutional affiliation
Citation Counts — Get citation and reference counts for any DOI
Reference Lists — Extract complete bibliographies from published works
Preprint Search — Find preprints registered with CrossRef
DOI Validation — Verify whether a DOI is valid and registered
Recent Works — Monitor the latest DOI registrations

Who is this for?

Researchers — DOI resolution and bibliography management
Librarians — journal evaluation and publisher analysis
Research Administrators — funder tracking and institutional output
Bibliometricians — large-scale publication analytics

crossrefdoimetadatajournalspublishersfundersorcidbibliography

16 tools expose this connector's capabilities to your AI agent.

get_citations_count

The "is-referenced-by-count" is the number of times other works cite this DOI. The "references-count" is how many references this work cites. Quick way to assess a paper's impact. Get citation count for a DOI

get_funder_works

Use the funder ID from search_funders (e.g. "100000002" for NIH). Essential for understanding research funding landscapes and tracking funded output. Get works funded by a specific funding organization

get_journal

Returns title, publisher, subjects, total DOI count, current and backfile counts, metadata coverage percentages, and quality flags. Get journal details by ISSN

get_journal_works

Can be filtered with an optional text query. Useful for browsing a journal's publication history or searching within a specific journal. Get articles published in a specific journal

get_publisher

Returns name, DOI prefix, total/current/backfile DOI counts, metadata coverage scores, and quality flags. Get publisher details with output metrics

get_reference_list

Returns all cited references with their DOIs (when available), authors, titles, journals, and years. Essential for bibliography analysis, finding source material, and understanding a paper's intellectual foundations. Get full reference list (bibliography) for a DOI

resolve_doi

Returns title, authors, journal, publisher, publication date, volume, issue, pages, citation count, reference count, subject areas, and license information. The definitive tool for getting structured metadata from any DOI. Resolve a DOI to full bibliographic metadata

search_by_affiliation

Use institution names like "Stanford University", "MIT", "Harvard Medical School". Can be combined with a topic query. Search works by institutional affiliation

search_by_orcid

ORCID is the universal researcher identifier. Format: "0000-0002-1825-0097". Essential for finding the complete publication record of a researcher across all journals and publishers. Find works by ORCID author identifier

search_funders

Examples: "National Institutes of Health", "National Science Foundation", "European Research Council", "Wellcome Trust". Search funding organizations worldwide

search_journals

Returns journal titles, ISSNs, publishers, subject areas, total DOI counts, and metadata coverage scores. Use this to find journal identifiers and evaluate journal metrics. Search academic journals by title or ISSN

search_preprints

This covers preprints from bioRxiv, medRxiv, SSRN, ChemRxiv, and other preprint servers that register DOIs with CrossRef. Search registered preprints across all servers

search_publishers

Returns publisher names, DOI prefixes, and total DOI counts. Search academic publishers

search_recent_works

Default is last 7 days. Use this to monitor the latest publications across all journals and publishers. Find the most recently registered DOIs

search_works

Supports full-text query, filters, sorting, and pagination. Filter syntax: "from-pub-date:2024-01-01", "type:journal-article", "has-orcid:true", "has-references:true", "is-update:false". Sort options: "relevance", "published", "indexed", "is-referenced-by-count". Search 150M+ DOI-registered academic works

validate_doi

Returns whether the DOI exists in CrossRef, along with basic metadata (title, type, publisher) if valid. Useful for quality-checking reference lists and citation data. Check if a DOI is valid and registered

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