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Crossref MCP — wraps the Crossref REST API (academic papers, free, no auth)
npx @getmcp/cli add io.github.pipeworx-io/crossrefRequires Node.js 18+. Community-contributed server. Review source before installing.
Config file: ~/Library/Application Support/Claude/claude_desktop_config.json
{
"mcpServers": {
"io.github.pipeworx-io/crossref": {
"url": "https://gateway.pipeworx.io/crossref/mcp",
"transport": "streamable-http"
}
}
}