MCP serverio.github.simonmak-ascent/primary-sources-mcp

Search Singapore's ACRA corporate-entity registry via data.gov.sg (free, no key, Singapore Open Data Licence). Search by entity name or exact UEN; returns UEN, name, status, entity

Search arXiv preprints (free, no key). Returns titles, abstracts, authors, publication dates and PDF links. Use for preprints in physics, math, CS and related fields; use pubmed_se

Search a national CKAN open-data portal (free, no key). Supported portals: uk (data.gov.uk) and au (data.gov.au). Returns dataset titles, notes, organizations and resource URLs. Us

Search ClinicalTrials.gov studies (free, no key). Returns NCT ids, brief titles, status and start date with study URLs. Use for registered clinical trial records.

Fetch one UK company record by company number (requires COMPANIES_HOUSE_API_KEY). Returns the full Companies House profile object (registered office, officers summary, SIC, status)

Search the UK Companies House register by name (requires COMPANIES_HOUSE_API_KEY). Returns company number, status, type, address and a Companies House URL per hit. Use for UK entit

Search Crossref for scholarly works (free, no key). Returns DOIs with title, authors, publication date, container and URL. Use for DOI/citation metadata discovery; use openalex_wor

Search the data.europa.eu EU open-data catalogue (free, no key). Returns dataset identifiers, titles, descriptions and countries. Use for EU-wide open datasets; use ckan_search for

Search DataCite for research-data DOIs (free, no key). Returns DOIs with titles, years, publishers and creators. Use to find citable datasets and their metadata; use crossref_works

Search a DBnomics dataset and return matching series (free, no key). DBnomics aggregates the World Bank, IMF, OECD, Eurostat, ECB, BIS and many national providers behind one API. P

Search the Directory of Open Access Journals (free, no key). Returns open-access articles with title, authors, journal, year and DOI. Use for OA scholarly articles with permissive

Fetch an ECB Data Portal time series in SDMX-JSON (free, no key). Provide an ECB flow and key; returns the SDMX header and datasets, bounded in size. Use for euro-area monetary/fin

Search Europe PMC (free, no key). Returns PMIDs, DOIs, titles, journals, years and authors across life-science literature. Use as an alternative/complement to pubmed_search with Eu

Fetch observations for a St. Louis Fed FRED economic series (requires FRED_API_KEY). Returns dated observations, newest first. Use for US and international economic time series (ra

Search the GBIF taxonomic backbone (free, no key). Returns scientific names, canonical names, rank, status and kingdom. Use for biodiversity/species name resolution.

Search GDELT DOC 2.0 global news (free, no key). Returns matching articles with title, URL, domain, language, seen date and source country, or a volume timeline. Use for news-volum

Look up Legal Entity Identifier (LEI) records from GLEIF (free, no key, CC0). Search by legal name or fetch one record by LEI; returns legal name, status, jurisdiction, legal form,

Search Project Gutenberg's public-domain catalogue via Gutendex (free, no key). Returns book ids, titles, authors, languages, download counts and Gutenberg URLs. Use to find free p

Query a DATA.GOV.HK dataset resource with structured filters (free, no key). Pass the resource URL from hk_open_data_search plus filters as an array of [column, operator, values] t

Search the Hong Kong government open-data catalogue DATA.GOV.HK (free, no key). Returns dataset titles, notes, organizations and resource download URLs. Use to discover HK datasets

List Hong Kong listed-company announcements from HKEXnews by stock code (free, no key). Resolves a 5-digit code or company name to the internal HKEX stockId, queries the titleSearc

Resolve a Hong Kong listed company and show its recent HKEXnews filings (free, no key). Returns the internal stockId, code, name, an HKEXnews filings URL, the headline category tax

Call the Hong Kong Monetary Authority public API (free, no key). Pass an HKMA data path to retrieve monetary, banking or market statistics as JSON. Use for HK monetary/liquidity da

Search Hacker News stories and comments via Algolia (free, no key). Returns titles, URLs, authors, points, comment counts and timestamps, sorted by relevance or date. Use for tech-

Search the Internet Archive (free, no key). Returns identifiers, titles, years, creators and media types with item URLs. Use for public-domain texts, audio, video and archived web

Fetch any URL as clean markdown via Jina Reader (free tier, no key). Use as an extraction fallback when a page is not available as structured data; returns up to 40,000 characters

Search the official MCP Registry for installable MCP servers (free, no key). Returns server names, titles, descriptions, versions and repository URLs. Use to discover MCP servers b

Fetch NASA Astronomy Picture of the Day entries (free; uses NASA_API_KEY or the shared DEMO_KEY which is heavily rate-limited). Returns date, title, explanation and media URL. Use

Geocode a place name with OpenStreetMap Nominatim (free, no key; usage policy requires a valid User-Agent and at most 1 request/second). Returns display name, latitude/longitude, t

Search Open Library for books (free, no key). Returns titles, authors, first-publish year, ISBNs and Open Library URLs. Use for bibliographic/book metadata; use gutendex_books for

Fetch current weather from Open-Meteo (free, no key). Returns current temperature, humidity, wind speed and weather code for a coordinate. Use for point weather data; use usgs_eart

Search OpenAlex scholarly works (free, no key, polite pool). Returns titles, years, DOIs, citation counts and authors. Use for literature discovery and citation signal; use crossre

Query openFDA drug adverse-event reports (free, no key). Returns safety report ids, receive dates, seriousness, product and reaction terms. Use for pharmacovigilance signals from t

Look up a chemical compound in PubChem (free, no key). Returns CID, molecular formula, molecular weight, SMILES and IUPAC name. Use for chemical/compound reference data.

Search PubMed biomedical literature via NCBI E-utilities (free; optional NCBI_API_KEY raises limits). Resolves matching PMIDs and then fetches article summaries. Use for biomedical

US SEC registrant profile plus recent filings by ticker or CIK (free, no key). Resolves a ticker via EDGAR company_tickers.json, then returns name, CIK, SIC, a filings URL and the

Full-text search US SEC EDGAR filings (free, no key). Searches the EDGAR full-text index and returns matching filings with form type, filing date, CIK and an Archives URL. Use for

Search Semantic Scholar papers with citation counts (free, no key; keyless requests are heavily rate-limited and may return HTTP 429 — retry later or supply a key for higher limits

Query the US Treasury Fiscal Data API (free, no key). Returns records for a fiscal-service endpoint such as debt to the penny. Provide an endpoint path and optional OData filter. U

Fetch UN Comtrade annual trade data for a reporter (free, no key, preview endpoint). Returns import/export records by commodity code. Use for official bilateral merchandise-trade s

Explore UN Sustainable Development Goal indicators (free, no key). Without a series code, list/filter the SDG series catalogue; with a series code, return that series' data. Use fo

Query the USGS earthquake catalogue (free, no key). Returns magnitude, place, time, coordinates and event URL. Use for seismic-event primary data.

Validate an EU VAT number against the European Commission VIES service (free, no key). Returns validity, the registered trader name and address. Use to verify an EU business VAT id

Query the WHO Global Health Observatory (free, no key). List/filter health indicators, or pass an indicator code to retrieve its data values. Use for official global health statist

Search Wikidata entities by label (free, no key, CC0). Returns Q-IDs with labels, descriptions and entity URLs. Use to resolve people, organizations, places and concepts to stable

Fetch Wikimedia pageview metrics for an article (free, no key, CC0). Returns daily view counts between two dates for a project/article. Use to gauge public attention or topic momen

Fetch a Wikipedia article summary (free, no key; content CC BY-SA, attribution required). Returns the lead extract, description, Wikidata id and article URL. Use for a quick encycl

Look up country reference metadata from the World Bank (free, no key). Returns ISO codes, name, region, income level, lending type and capital/lat-long. Use for canonical country/r

Fetch a World Bank development-indicator time series for one country (free, no key). Returns year/value observations for an indicator such as GDP or population. Use for long-run co

Search Zenodo research outputs (free, no key). Returns records with DOIs, titles, creators and publication dates. Use for datasets, software and papers deposited in Zenodo.