Do I need a CrossRef API key?

No. Vinkius hosts the connection, so you can start searching immediately without managing credentials.

Which AI clients can use this MCP?

You can use this with any MCP-compatible client, including Claude, Cursor, and Windsurf.

Can I search for specific types of publications?

Yes. You can use the capability to filter searches by work types like journal articles, books, or datasets.

How many records can I access?

The MCP provides access to over 150 million academic works in the CrossRef database.

Can I get abstracts for the papers I find?

Yes. When you use the capability to get a specific work by its DOI, it returns the abstract and other metadata.

Do I need an API key?

No! CrossRef API is completely free and open. No authentication required. Just subscribe and start searching. Rate limit is 50 requests/second for polite pool.

DOI (Digital Object Identifier) is a unique alphanumeric string assigned to academic works. It provides a persistent link to the work's location online. Example: 10.1038/nature12373.

How can I filter search results?

Use the filter parameter with CrossRef filter syntax. Examples: 'type:journal-article' for journal articles only, 'from-pub-date:2024' for papers from 2024 onwards, 'has-abstract:true' for papers with abstracts, 'has-full-text:true' for open access papers.

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Connect CrossRef (Alternative) to ChatGPT, Claude and Gemini

Set it up once and it works in ChatGPT, Claude, Cursor, and any other client you love. It all runs safely in the background, so you can relax and focus on what really matters. Pull metadata from 150 million academic works instantly.

Ask AI about this Connector

Developed, maintained, and hosted by Vinkius.

MCP VERIFIED · PRODUCTION READY · VINKIUS GUARANTEED

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Works with modern AI clients that support MCP, including ChatGPT, Claude, Cursor, and more.

Your AI does the work. We keep it safe and sound.

No other AI tool gives you this. Your workflow runs in the client you already love, your account stays protected, and you decide what the agent can and cannot do. It is the whole reason to make the switch.

Each Connector lives inside our infrastructure, the same place where your workflow runs. The three things below are already part of it, working quietly in the background so you never have to think about them. Nothing to add, nothing to set up, nothing to worry about.

V8 Isolate01

Each Connector runs inside its own sealed environment.

Each Connector runs inside its own sealed V8 runtime — no access to your files, your system, or other servers. A Connector never sees past its own request.

Kill Switch02

One switch stops every agent. Instantly.

One action deactivates every Connector, revokes every token, and ends every session at once. AI Governance keeps the record.

FinOps per User03

Spending limits that pause instead of surprise.

Every user keeps their own connections and credentials, isolated from everyone else. Anything that would cross your spending limit is held for your approval, not billed.

Three controls, built into the layer your AI connects through.

Curated set · 13 capabilities

We ship only the actions that matter.

Capability set01 / 04

01-04

4 capabilities in this set.

Part of 13 available through CrossRef.

01
Search journals
Find academic journals by name to get their ISSNs, publisher info, and total work counts.
02
Search members
Locate CrossRef member organizations using their names to see their IDs and work counts.
03
Search publishers
Search for academic publishers to see how many journals and works they manage.
04
Get works by doi list
Retrieve metadata for a group of works by providing a list of their DOIs.

Capability set02 / 04

05-07

3 capabilities in this set.

Part of 13 available through CrossRef.

05
Search funders
Identify research funding organizations and see the volume of work they support.
06
Get funder
Get specific details about a research funder, including their location and work count.
07
Get journal
Pull full details for a specific journal using its ISSN.

Capability set03 / 04

08-10

3 capabilities in this set.

Part of 13 available through CrossRef.

08
Get licenses
List the different academic licenses used across scholarly publications.
09
Get member
Get detailed information about a specific CrossRef member organization.
10
Get publisher
Retrieve specific data on a publisher, including their journal counts and location.

Capability set04 / 04

11-13

3 capabilities in this set.

Part of 13 available through CrossRef.

11
Get types
Get a list of available academic work types to help filter your searches.
12
Get work
Fetch complete metadata for a single work using its DOI, including abstracts and citation counts.
13
Search works
Search the full database using keywords, authors, or titles with advanced filters for dates and types.

Real work

What teams actually run

Literature Reviews

Ask your agent to find all papers on a specific topic from a certain year to build a bibliography.

Citation Verification

Provide a DOI to your agent to confirm the author, journal, and publication date of a source.

Funding Analysis

Identify which organizations are funding specific research areas by searching for funders and their works.

Journal Discovery

Find which journals belong to a specific publisher to target your own submissions.

Automate a task

Put CrossRef to work on one thing.

Step-by-step automations your AI runs through this Connector: the workflow, the prompts to start with, and the exact capabilities behind each move.

One connector, every AI

CrossRef works with the most popular AI clients.

These are the most popular clients, each with a step-by-step guide: one link, set up once, with governance and visibility built in. And because everything runs on the MCP standard, the same connection also works in any other compatible client — nothing to rebuild.

Building your own app? The connector is yours to use.

You don't need a client to put CrossRef to work: the same hosted connection plugs into your own applications and agent code, with the same governance on every request. Build with it, chat with it — one connection for both.

Observed, not estimated

992ms average. Fast in production.

CrossRef is checked daily against the live service.

Daily averagePeak 1065ms

Oct 11Today

Fastest day: 793ms
Slowest day: 1065ms
14-day trend: Slowing+34%

Connect your client

One URL. Every client.

Activate the Connector, copy your link, and paste it into the client you already use. 13 capabilities arrive ready to run.

Preview access · not provider authentication

The vk_preview_* token belongs to Vinkius preview infrastructure. It lets Claude discover and display the capabilities of CrossRef, so you can see the experience inside your AI.

It does not authenticate your account with CrossRef. Actions requiring credentials or live account data may not run until you activate the Connector and authorize the service.

CrossRef Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_7En7HkI3TaUnNOjPwedGkhoVim2MwFUFc9BHK8QJ/mcp

Claude Desktop

Follow the steps below to connect in seconds.

1In Claude Desktop, open Settings → Connectors.
2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
3Click Add and start a new chat — CrossRef capabilities are ready to use.

Configuration · claude_desktop_config.jsonCopy

{
  "mcpServers": {
    "crossref-alternative-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_7En7HkI3TaUnNOjPwedGkhoVim2MwFUFc9BHK8QJ/mcp"
    }
  }
}

Claude
ChatGPT
Cursor
VS Code
Windsurf
Claude Code
JetBrains
Cline

Step-by-step instructions for each client are in the guide. How to connect

Guided setup for Claude? Set up CrossRef in Claude and other AIs

See all the AI clients this connector works with ↑

Who it's for

Built for the work CrossRef owners hand off.

This MCP is built for anyone working with large volumes of scholarly literature who needs fast, accurate metadata.

01
Researchers
They use the agent to find relevant papers and check citation counts for their literature reviews.
02
Students
They use the capability to search for specific topics and find credible journal sources.
03
Librarians
They use the MCP to look up DOIs and verify journal metadata and citations.

FAQ

Questions CrossRef owners ask.

01
Do I need a CrossRef API key?
No. Vinkius hosts the connection, so you can start searching immediately without managing credentials.
02
Which AI clients can use this MCP?
You can use this with any MCP-compatible client, including Claude, Cursor, and Windsurf.
03
Can I search for specific types of publications?
Yes. You can use the capability to filter searches by work types like journal articles, books, or datasets.
04
How many records can I access?
The MCP provides access to over 150 million academic works in the CrossRef database.
05
Can I get abstracts for the papers I find?
Yes. When you use the capability to get a specific work by its DOI, it returns the abstract and other metadata.
06
Do I need an API key?
No! CrossRef API is completely free and open. No authentication required. Just subscribe and start searching. Rate limit is 50 requests/second for polite pool.
07
What is a DOI?
DOI (Digital Object Identifier) is a unique alphanumeric string assigned to academic works. It provides a persistent link to the work's location online. Example: 10.1038/nature12373.
08
How can I filter search results?
Use the filter parameter with CrossRef filter syntax. Examples: 'type:journal-article' for journal articles only, 'from-pub-date:2024' for papers from 2024 onwards, 'has-abstract:true' for papers with abstracts, 'has-full-text:true' for open access papers.

Explore

More in The Unthinkable

Connect CrossRef to Claude, Cursor, ChatGPT & more

Your AI does the work. We keep it safe and sound.

Each Connector runs inside its own sealed environment.

One switch stops every agent. Instantly.

Spending limits that pause instead of surprise.

We ship only the actions that matter.

01-04

Search journals

Search members

Search publishers

Get works by doi list

05-07

Search funders

Get funder

Get journal

08-10

Get licenses

Get member

Get publisher

11-13

Get types

Get work

Search works

What teams actually run

Literature Reviews

Citation Verification

Funding Analysis

Journal Discovery

Building your own app? The connector is yours to use.

CrossRef Connector

Claude Desktop

Researchers

Students

Librarians

Do I need a CrossRef API key?

Which AI clients can use this MCP?

Can I search for specific types of publications?

How many records can I access?

Can I get abstracts for the papers I find?

Do I need an API key?

What is a DOI?

How can I filter search results?

CrossRef AI Connector

DataCite REST AI Connector

Semantic Scholar AI Connector

Unpaywall (Open Access Papers) AI Connector

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