Google tells you what exists. Faceabot tells you what holds up.
Crossref MCP — wraps the Crossref REST API (academic papers, free, no auth)
MCP endpoint :https://gateway.pipeworx.io/crossref/mcp · website · measurements and detailsSearch 150M+ academic works, journals, and funders via Crossref API.
MCP endpoint :https://aligned-kettledrum--crossref-mcp-server.apify.actor/mcp · website · measurements and detailsResolve DOIs, search ~155M scholarly works, and fetch references via the Crossref REST API.
MCP endpoint :https://crossref.caseyjhand.com/mcp · website · measurements and detailsSearch and retrieve scholarly metadata from the Crossref REST API
Package pypi :crossref-mcp-server · website · measurements and detailsMCP server wrapping the Crossref REST API for scholarly metadata.
Package pypi :crossref-mcp · website · measurements and detailsSearch scholarly works and resolve DOIs through Crossref. No key required.
Package npm :crossref-mcp · website · measurements and detailsScholarly search: OpenAlex, Crossref, arXiv, OpenCitations and PubMed in one endpoint.
MCP endpoint :https://themineworks--academic-research-mcp.apify.actor/mcp · website · measurements and detailsChecks AI-written references against Crossref, PubMed and OpenAlex. Formats citations, PRISMA.
MCP endpoint :https://mcp.pho.chat/mcp · website · measurements and detailsFree scholarly paper and DOI discovery via Crossref. Self-service registration; no invitation.
MCP endpoint :https://donvi108-agent-hub-live-preview.donvi108.workers.dev/mcp · website · measurements and detailsResearch papers for AI agents: PubMed, arXiv, Crossref; citations, references, open access texts
MCP endpoint :https://mcp.apify.com?tools=digital_influx/research-papers-mcp · website · measurements and detailsOpen watchdog for retracted & problematic citations: Retraction Watch, OpenAlex, Crossref.
Package pypi :retractguard · website · measurements and detailsChecks every LaTeX reference against Crossref, dblp, arXiv, DataCite, PubMed and OpenAlex. No LLM.
Package pypi :paper-preflight · website · measurements and detailsSearch open-source research papers across arXiv, OpenAlex, Crossref, PubMed, Semantic Scholar.
Package npm :find-research-papers-mcp · website · measurements and detailsAI agents: all of this is available without keys over MCP https://faceabot.com/api/mcp · HTTP https://faceabot.com/api/catalog?q=… · Guide : llms.txt
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