Recently added agent tools.

ClinicalTrials MCP — wraps ClinicalTrials.gov API v2 (free, no auth)

NIH Clinical Tables: ICD-10/9, RxTerms, LOINC, NPI, conditions search. Keyless.

Climatiq MCP — carbon footprint calculator with emission factors

Climate & Energy Feeds MCP.

Climate MCP — wraps Open-Meteo Climate API (free, no auth)

ClickUp MCP — wraps the ClickUp REST API v2 (BYO API key)

Cleveland Museum of Art Open Access API (~63k artworks, many CC0)

Clash Royale player, clan, war, tournament, rankings, cards. Supercell dev key.

Civitai MCP.

Citybikes MCP — wraps CityBik.es API (free, no auth required)

CISA Known Exploited Vulnerabilities catalog

Chuck Norris MCP — wraps chucknorris.io (free, no auth)

China A-shares MCP. Keyless.

Chile Government Procurement MCP — Mercado Público / ChileCompra (keyless-ish).

Chess.com MCP — wraps the Chess.com public API (free, no auth)

ChEMBL MCP — drug discovery database (EBI).

PC game deals across Steam/Epic/GOG/Humble via CheapShark. Keyless.

Chargebee MCP Pack — wraps the Chargebee API v2

chaos-index MCP — wraps StupidAPIs (requires X-API-Key)

Chainlist MCP — registry of EVM chains

CFTC Commitment of Traders (COT) MCP.

CFPB MCP — Consumer Financial Protection Bureau complaint database (free, no auth)

Census Trade MCP — US Census Bureau International Trade data

Census MCP — U.S. Census Bureau housing-relevant APIs.

Hong Kong Census and Statistics Department (C&SD) open-data MCP.

CelesTrak MCP — satellite orbital elements (TLE / GP data) for any tracked object.

California Data Exchange Center (CDEC) hydrology, reservoirs, snow water

CDC MCP — wraps CDC open data via Socrata API (data.cdc.gov)

Statistics Netherlands (CBS / StatLine) OData MCP.

Israel Central Bureau of Statistics (CBS / הלשכה המרכזית לסטטיסטיקה) MCP.

cBioPortal MCP — cancer genomics portal.

Cat Facts MCP — wraps Cat Facts API (free, no auth)

Catalogue of Life — global taxonomic index of known species (~2.2M accepted names)

CATAAS MCP — Cat as a Service (free, no auth)

Carbon Interface MCP — Carbon Interface API (v1)

UK Carbon Intensity MCP (National Grid ESO).

Carbon MCP — UK Carbon Intensity API (free, no auth)

caniuse MCP — browser feature support tables

Canada Government Procurement MCP — CanadaBuys open data (keyless).

Calendly MCP Pack — wraps the Calendly API v2 for scheduling data.

NCI CACTUS Chemical Identifier Resolver MCP.

California state contract awards & purchase orders: search, top vendors, agency spend — keyless

California Grants Portal MCP — open State of California grant funding opportunities (keyless).

California DMV: vehicle and EV registrations by ZIP, field offices, forms, insurer NAIC codes

buzzword-density MCP — wraps StupidAPIs (requires X-API-Key)

Business Feeds MCP.

Bungie.net Destiny 2 + clan API: manifest, profile, characters, stats.

Bundlephobia MCP — npm bundle-size analysis

Bundestag DIP MCP

Deutsche Bundesbank (Germany's central bank) statistics MCP.