PubChem MCP — NIH chemistry compound database (no auth)
Free
1,834 MCP servers
Works with Grok BuildBy pipeworx-io
PubMed MCP — wraps the NCBI E-utilities API (biomedical literature, free, no auth)
Free
Pulse Verity — crypto index prices that come with a PROOF.
Free
PVGIS MCP — EU Joint Research Centre PV system modeler
Free
PyPI MCP — wraps the Python Package Index (PyPI) JSON API (free, no auth).
Free
QuickBooks MCP Pack — query customers, invoices, and accounts via QuickBooks Online API.
Free
Quran MCP — Al-Quran Cloud API.
Free
Radar MCP — wraps the Radar Geocoding / Search API (radar.com)
Free
RCSB PDB MCP — experimentally determined macromolecular structures.
Free
Real Estate Japan MCP — actual residential/commercial transaction prices and
Free
Recipes MCP — wraps TheMealDB API (free tier, no auth)
Free
Recreation.gov MCP — wraps the Recreation Information Database (RIDB) API v1
Free
Reddit MCP — public Reddit data via the Atom/RSS feeds.
Free
Regulations.gov MCP — federal regulatory dockets, documents, public comments
Free
ReliefWeb MCP — the UN OCHA humanitarian information service.
Free
RemoteOK MCP — remote-work job board (tech-heavy), keyless.
Free
Remotive MCP — curated remote-only job board
Free
Repology MCP — cross-distro package version aggregator.
Free
Rijksmuseum — the Dutch national museum's collection, via its open Data
Free
Riksdagen (Swedish Parliament) open data MCP.
Free
RubyGems MCP — wraps the RubyGems.org public API (free, no auth)
Free