MCP.Market

Crossref MCP server

online · 100% uptime
by cyanheads·io.github.cyanheads/crossref-mcp-server·v0.5.1·3 stars
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Resolve DOIs, search ~188M scholarly works, and fetch references via the Crossref REST API.

A93/100grade A
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Safety scan
A93/100

not scanned yet

Adoption
Growing

3 stars752 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

Crossref tools

Tool list not cached yet. `describe` through the gateway fetches it live.

Not scanned yet. New listings are scanned within a day or two of arriving.

How Crossref compares

Against every graded Web search MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
93/100
higher than 95% of 3,470 Web search servers
Uptime
100%
of our recent checks; the typical remote Web search server answers 100%
Response time
305 ms
faster than 51% of 2,238 Web search servers
GitHub stars
3
more than 73% of 1,786 Web search servers
Downloads a week
752
more than 92% of 827 Web search servers with a package

Release history: 8 versions in the registry since 2026-09-13, latest 2026-11-04, typically one every 6 days.

Install Crossref in Claude Code, Cursor or VS Code

claude mcp add --transport http crossref-mcp-server https://crossref.caseyjhand.com/mcp
Add to Cursor

What the publisher says

From the Crossref repository's README, as published. We do not edit it. Read it on GitHub

@cyanheads/crossref-mcp-server Resolve DOIs, search ~155M scholarly works, fetch references, and look up publishers via the Crossref REST API. STDIO or Streamable HTTP. 7 Tools

Public Hosted Server: https://crossref.caseyjhand.com/mcp

Overview

Scholarly metadata from the Crossref REST API. Resolve DOIs to full metadata records, search across ~155 million scholarly works by free text or structured filters, fetch outgoing reference lists, and look up journals, funders, and publishers. Runs as a stdio process, a local Streamable HTTP server, or the public hosted endpoint above.

Tools

Capability reference

crossrefgetwork tool

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Crossref: common questions

Is Crossref MCP server safe?
Yes, by our scan: it is graded A (93/100). Read the Crossref safety report
How do I install Crossref?
It runs remotely at crossref.caseyjhand.com. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Crossref need an API key?
No secret keys are declared. It reads 13 settings from the environment.
Is Crossref maintained?
The last commit was 41 days ago (2026-09-24). The latest release is v0.5.1.
Is Crossref up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
What can I use instead of Crossref?
Servers from other publishers that do the same job: Claude Code Ultimate Guide MCP server and Apple Contacts MCP server.
How does Crossref compare with other Web search MCP servers?
safety score 93/100 (higher than 95% of 3,470 Web search servers); uptime 100% (of our recent checks; the typical remote Web search server answers 100%); response time 305 ms (faster than 51% of 2,238 Web search servers). Full comparison.

Alternatives to Crossref

Same job from other publishers: the closest match first, then the best rated.

  • Claude Code Ultimate Guide
    Search the Claude Code Ultimate Guide and machine-readable references from any MCP client.
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  • Apple Contacts
    Inspect and search Apple Contacts on macOS, and resolve a contact into a message-ready recipient.
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