Model Context Protocol servers that extend AI capabilities
RDAP — Registration Data Access Protocol (domains, IPs, ASNs) via IANA bootstrap
Reactome biological pathway database
LEGO catalog: sets, parts, minifigs, themes, colors via Rebrickable. Free key required.
Regulations.gov MCP — federal regulatory dockets, documents, public comments
Remotive MCP — curated remote-only job board
Repology cross-distro package version aggregator
RFC Editor — full RFC text + metadata + errata + BCP/STD mappings
Riot Games API: accounts, summoners, matches, league entries, champion mastery.
RIPE Stat MCP — IP/ASN/BGP data
Roblox public profile + friends + badges + games + groups lookups.
Research Organization Registry (ROR) — canonical org IDs
rss2json: convert any RSS/Atom feed to JSON. Keyless basic, optional API key for count.
Statistics Sweden (SCB) — PxWeb JSON-stat statistical database
JSON Schema catalog (SchemaStore.org)
setlist.fm: concert setlists by artist/venue/date. Free key required.
CDS SIMBAD — astronomical object database (~14M objects) via TAP/script
Solscan MCP — Solana block-explorer API (Pro v2)
SPDX open-source license list with full text
Spoonacular food API: recipes, nutrition, ingredients, meal plans. Free 150/day.
Spotify MCP — Web API via client_credentials OAuth
AFL (Australian Football League) fixture, ladder, and crowd-sourced tips
Statistics Canada (StatCan) WDS MCP — Canadian official statistics (no auth)
Steam Web API: profiles, owned games, achievements, app news, player counts.
STRING protein-protein interaction networks across ~12k organisms