crossref

Wraps the Crossref REST API for searching and retrieving academic paper metadata without requiring authentication. Good for building research assistants, citation tools, or anything that needs to pull publication data, DOIs, author info, or journal details on the fly. Part of the Pipeworx gateway, so you can either use it standalone or tap into their broader collection of 250+ data sources. Includes an ask_pipeworx helper that lets you query in natural language instead of calling specific tools directly. Free tier available, runs over streamable HTTP, and you just drop the gateway URL into your MCP client config.