Is Crossref Api free?

Yes, Crossref Api is free to use.

How do I install Crossref Api?

Crossref Api is a local plugin. Install it using PyPI package: crossref-mcp and add the generated configuration snippet to your AI app's MCP config file. Then restart your AI app.

What credentials does Crossref Api need?

Crossref Api requires the following credentials or environment variables: CROSSREF_MAILTO, CROSSREF_PLUS_TOKEN, MCP_API_KEY. You can find setup instructions on the server detail page.

What AI apps work with Crossref Api?

Crossref Api uses the Model Context Protocol (MCP) and works with any MCP-compatible AI app, including Claude, ChatGPT / Codex, Gemini, Copilot, Cursor, and more.

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Crossref Api MCP Server

by Jtl Neo

Developer ToolsLow Risk8.2MCP RegistryLocal

Free

Server data from the Official MCP Registry

MCP server wrapping the Crossref REST API for scholarly metadata.

About

MCP server wrapping the Crossref REST API for scholarly metadata.

Security Report

8.2

Low Risk8.2Low Risk

This is a well-designed MCP server wrapping the Crossref REST API with thoughtful security architecture. Authentication is optional but properly scoped; the codebase is clean with proper error handling, input validation, and no malicious patterns. Rate limiting, caching, and credential handling follow best practices. Minor code quality observations around broad exception handling and logging do not meaningfully impact security. Package verification found 1 issue.

7 files analyzed · 5 issues found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.

Permissions Required

This plugin requests these system permissions. Most are normal for its category.

HTTP Network Access

Connects to external APIs or services over the internet.

env_vars

Check that this permission is expected for this type of plugin.

File System Read

Reads files on your machine. Normal for tools that analyze or process local data.

What You'll Need

Set these up before or after installing:

Email for Crossref's polite pool (recommended).Optional

Environment variable: CROSSREF_MAILTO

Optional Crossref Plus API token.Required

Environment variable: CROSSREF_PLUS_TOKEN

Optional X-API-Key for HTTP transport.Required

Environment variable: MCP_API_KEY

How to Install

Add this to your MCP configuration file:

{
  "mcpServers": {
    "io-github-jtl-neo-crossref-mcp": {
      "env": {
        "MCP_API_KEY": "your-mcp-api-key-here",
        "CROSSREF_MAILTO": "your-crossref-mailto-here",
        "CROSSREF_PLUS_TOKEN": "your-crossref-plus-token-here"
      },
      "args": [
        "crossref-mcp"
      ],
      "command": "uvx"
    }
  }
}

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Crossref Api MCP Server

About

Security Report

Findings (5)

Permissions Required

What You'll Need

How to Install

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