MCP Server Directory

Datacite io.github.pipeworx-io/datacite

DataCite MCP — DOIs for research datasets (free, no auth)

Domains io.github.pipeworx-io/domains

Domains MCP — domain registration lookup + availability search over live

optics-mcp com.sunex/optics-mcp

Search Sunex lenses and imager sensors, match compatible optics, get pricing. No API key needed.

Unofficial read-only MCP for fundamentals, macro & news (EDGAR + FRED + Tavily, BYO-key).

Findymail io.github.pipeworx-io/findymail

Findymail MCP — B2B email finder & reverse-email lookup (findymail.com)

mcp io.github.SpaceFrontiers/mcp

Citable retrieval across papers, books, patents, Wikipedia, and live social sources.

Stompy – AI Memory for Claude & MCP Agents ai.stompy/stompy

Persistent AI memory with semantic search, conflict detection, and ticketing.

Search and resume past Claude Code conversations. An elephant never forgets.

Mime io.github.pipeworx-io/mime

MIME type lookup MCP.

Nih Reporter io.github.pipeworx-io/nih-reporter

NIH RePORTER MCP — every NIH-funded research project (free, no auth)

Openaire io.github.pipeworx-io/openaire

OpenAIRE MCP — EU research outputs (publications, datasets, software, projects)

castles com.thecastlemap/castles

2,400 castles, fortresses & palaces: name search, nearby, fame ranking, statistics. No key, CC0.

Amazon Trends MCP ai.trendsmcp/amazon

Amazon product search demand over time, with growth for any keyword. Free key at trendsmcp.ai

MailX Email Deliverability com.themailx/email-deliverability

Check SPF/DKIM/DMARC/BIMI, blacklists, SMTP/IMAP; DNS lookups; generate email DNS records.

Deterministic ebook-to-markdown pipeline with MCP tools to browse, search, and read your books.

Google Trends MCP ai.trendsmcp/google-trends

Google Trends: Search, Images, News, Shopping over time, growth metrics. Free key at trendsmcp.ai

VenuVidya — Carnatic Flute Study Guide io.github.pradeep-anantha/venuvidya

Kannada/English Carnatic flute KSGMS syllabus — search lessons, log practice, ask a RAG guru.

MCP server for searching MCP protocol documentation

freeport-nostr io.github.ptrinh/freeport-nostr

Search Freeport Nostr events by kind, tag & geohash radius (rides, services, reputation).

Compoid MCP com.compoid/mcp-server

A collaborative repository where AI agents and humans share research, images, videos and papers.

Verified UK company lookup & validation for AI agents — Companies House data, snapshot or live.

Verified ICD-10-CM code lookup & validation for AI agents — official descriptions, not guesses.

HamQTH.com MCP server. Free callsign lookup, DX spots, RBN data, SAVP verification.

Islands on the Air MCP server. Group lookup, island search, DXCC mapping, nearby groups.