Low

ACLED MCP — Armed Conflict Location & Event Data Project

Low

AlienVault OTX MCP — Open Threat Exchange (free with key)

Low

An API of Ice and Fire — A Song of Ice and Fire (books/characters/houses)

Low

arXiv MCP — preprint server search (free, no auth)

Low

Bioregistry — meta-registry of biomedical identifier prefixes

Low

bioRxiv + medRxiv preprint server API

Low

Blockchair multi-chain block explorer (BTC, ETH, LTC, DOGE, XMR, +12 more)

Low

Blockstream Esplora Bitcoin block explorer (mainnet + testnet)

Low

Brave Search MCP — independent web index (no Google/Bing dependency)

Low

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

Low

CISA Known Exploited Vulnerabilities catalog

Low

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

Low

Codeforces competitive programming users, contests, problems

Low

Code::Stats public coding-XP profiles (codestats.net)

Low

Wikimedia Commons file/image/audio/video search via MediaWiki Action API

Low

Companies House MCP — UK statutory company registry (BYO key)

Low

CPSC MCP — US consumer-product safety recalls (CPSC, free, no auth).

Low

City of Chicago Socrata open-data portal

Low

data.europa.eu — official EU open-data hub (~1.6M datasets)

Low

data.ny.gov — New York State open-data Socrata portal

Low

France data.gouv.fr open-data catalogue

Low

Australia data.gov.au open-data catalogue (CKAN)

Low

Harvard Dataverse — research dataset repository (~150k datasets)

Low

Deezer public music catalog (search/tracks/albums/artists/charts)

Low

deps.dev — Google's package metadata + dependency graph API

Low

Domains MCP — RDAP domain lookup (ICANN standard, free, no auth)

Low

DWDS German Digital Dictionary (snippet/lemma/concordance/kwic)

Low

EBI Ontology Lookup Service — 250+ biomedical ontologies

Low

EDGAR MCP — SEC EDGAR public APIs (free, no auth)

Low

Ensembl REST — vertebrate genomes, sequences, comparative genomics, variation

Low

Encyclopedia of Life (EOL) — biodiversity taxa, names, hierarchies

Low

Etherscan MCP — multichain block-explorer API (Etherscan V2)

Low

European Parliament Open Data — MEPs, plenary docs, sessions

Low

NASA Exoplanet Archive — ~5600 confirmed exoplanets + candidates

Low

FAA Delays MCP — live US airport operational status (FAA, free, no auth).

Low

abuse.ch Feodo Tracker botnet C&C IP blocklist

Low

Flickr keyless public photo feeds (recent, by tag, by user, by group)

Low

Finnish Meteorological Institute open data (forecast, observations, warnings)

Low

Quote-based screencap search for Simpsons, Futurama, Rick and Morty

Low

GDACS — Global Disaster Alert & Coordination System (EQ/TC/FL/VO/DR/WF)

Low

GDELT MCP — Global Database of Events, Language, and Tone (free, no auth)

Low

Canonical .gitignore templates from github/gitignore

Low

GLEIF MCP — Global Legal Entity Identifier Foundation (free, no auth)

Low

Broad Institute gnomAD genomic variant database (GraphQL)

Low

GOV.UK Content + Search APIs (every gov.uk page + full search)

Low

Grants.gov MCP — open federal grant opportunities (free, no auth)

Low

GreyNoise Community MCP — internet scanner classification (free tier with key)

Low

GTEx — Genotype-Tissue Expression human gene-expression atlas

Low

HAL — French national open research archive

Low

Have I Been Pwned MCP

Low

Homebrew formulae + casks + install analytics (formulae.brew.sh)

Low

NASA JPL Horizons — solar-system body ephemerides

Low

HTS MCP — US import tariff rates via the USITC Harmonized Tariff Schedule.

Low

IETF Datatracker RFCs / drafts / working groups / people

Low

iNaturalist MCP — citizen-science species observations (free, no auth for read-only)

Low

INSPIRE-HEP high-energy physics literature database

Low

ISO country/language/currency/script code lookups (Debian iso-codes JSON)

Low

Kitsu anime + manga catalogue (JSON:API)

Low

Launch Library 2 MCP — global rocket launch data

Low

Lemmy federated link-aggregator public reads (any instance)

Low

LibriVox public-domain audiobooks (~17000 titles in dozens of languages)

Low

Lichess public API: players, ratings, eval, tablebase, opening explorer

Low

Song lyrics lookup via lyrics.ovh

Low

MAST (Mikulski Archive for Space Telescopes) — Hubble/JWST/Kepler/TESS

Low

MET Norway weather (api.met.no behind yr.no) — global forecast, sunrise, ocean

Low

MITRE ATT&CK adversary TTPs (STIX bundles)

Low

MITRE Common Weakness Enumeration (CWE) API

Low

Monarch biomedical knowledge graph — diseases, phenotypes, genes, variants

Low

MyGene.info — gene annotation joining NCBI/Ensembl/UniProt/KEGG/OMIM

Low

n8n MCP — query your own n8n instance (BYO).

Low

NASA EONET MCP — Earth Observatory Natural Event Tracker

Low

NCBI E-utilities — federated Entrez search/fetch (PubMed/Gene/Nucleotide/…)

Low

NHTSA MCP — wraps the NHTSA vPIC (Vehicle Product Information Catalog) API (free, no auth)

Low

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

Low

NOAA Storm Prediction Center — outlooks, storm reports, watches

Low

NOAA Space Weather Prediction Center (solar wind, Kp, aurora, alerts)

Low

NOAA Tides & Currents — observations, predictions, datums, station metadata

Low

NSF Awards MCP — National Science Foundation award database (free, no auth)

Low

OECD MCP — Organisation for Economic Co-operation and Development data

Low

UK Office for National Statistics dataset catalogue + Beta JSON API

Low

Open Notify MCP — ISS position + people in space

Low

OpenCitations COCI — open-license citation index by DOI

Low

Open Collective public collective/transaction data

Low

open.canada.ca — Canada national open-data catalogue (CKAN)

Low

OpenFIGI — Bloomberg open financial-instrument symbology service

Low

Open Food Facts — collaborative food product database

Low

Open Targets disease/target/drug knowledge graph (GraphQL)

Low

Open Topo Data — global elevation lookups (multiple DEM datasets)

Low

Openverse Creative-Commons image + audio search

Low

ORCID public researcher records (works, employment, education)

Low

OSV.dev — Google's open-source vulnerability database

Low

OWID MCP — Our World in Data chart/indicator access (free, no auth)

Low

PermID MCP — Refinitiv / LSEG Permanent Identifier (free, requires API key)

Low

PLOS journals — Solr-backed full-text search across all PLOS OA content

Low

Mozilla Public Suffix List — eTLD parser (cached 24h)

Low

PyPIStats.org — PyPI download statistics

Low

Reactome biological pathway database

Low

Repology cross-distro package version aggregator

Low

RFC Editor — full RFC text + metadata + errata + BCP/STD mappings

Low

Research Organization Registry (ROR) — canonical org IDs