"An explanation or resources about vectors (mathematics, physics, programming, or graphics)" matching MCP servers:

Enables searching and retrieving classical music works, scores, and recordings from IMSLP via natural language, without requiring an API key or account. It respects IMSLP's crawl policies and reports copyright status per jurisdiction.

An MCP server for the Internet Archive that enables searching the full text of digitized books, browsing the catalogue, and reading Wayback Machine captures. No API key or configuration required.

Enables currency conversion and exchange rate lookups using real ECB reference rates, free and without an API key. Supports natural language queries like 'convert 100 USD to EUR' or 'what's the exchange rate between GBP and JPY?'.

An MCP server that exposes World of Warcraft character data from the Blizzard API, offering read-only tools for character summaries, equipment, Mythic+ scores, realm lookup, and other character sub-resources.

An MCP server that lets LLMs query USGS NHDPlus HR hydrography data—streams, rivers, lakes, stream gages, and watershed boundaries—via point or GeoJSON geometry intersection queries.

Ask about the Saudi economy in plain English or Arabic. No API key or database required.

MCP server for accessing ILOSTAT (ILO statistical database) with tools to search indicators, retrieve metadata, list dimension values, and fetch data, with full provenance tracking.

Checks whether a company holds a UK or Netherlands work-visa sponsorship licence via the SponsorFinder API.

Enables AI assistants to search Twitter/X, YouTube, Reddit, Google, app-store listings, and 100+ other public web data endpoints via natural language, with prepaid credit or per-call USDC payment and no account or OAuth required.

Enables retrieval of academic literature metadata via DOI or search using the Crossref REST API.

An MCP server that provides weather forecasts and current conditions for any city via the free Open-Meteo API, with no API key or account required.

An MCP server providing progressive discovery tools for SDMX statistical data, enabling AI agents to explore and access SDMX-compliant repositories through interactive tools, resources, and prompts.

Enables searching the Kakao Daum Book Search API by title, author, publisher, or ISBN, retrieving detailed bibliographic and pricing metadata, and exporting results to xlsx, csv, json, or sqlite through MCP or CLI.

MCP server for Polish company registries that enables looking up companies by NIP or KRS using public government APIs with no authentication required.

Checks whether a citation has been retracted, corrected, or flagged with an expression of concern by querying Crossref — including retractions that Crossref backfills from the Retraction Watch database, which publishers often never record in their own metadata. Lets an AI agent verify a DOI, or every DOI in a reference list, before using it in research or writing.

Enables looking up Danish companies by CVR number, name, or phone via cvrapi.dk.

MCP Server for Swiss federal law — search the SR, monitor legal changes, and query BBl/treaties via Claude Desktop or Claude.ai.

An MCP server that enables AI to correctly search and query Tokyo's open data by automatically handling synonym variations, warning about misleading update timestamps, and skipping empty rows in API responses.

Enables querying French company registry data by name, SIREN, or SIRET, returning clean JSON with registry codes translated into plain French labels. Supports searching, full profiles, establishment listings, and decoding of NAF/legal form/workforce codes without requiring an API key.

Enables querying Finnish open data by retrieving company details from PRH/YTJ using a business ID or name and searching public procurement notices from Hilma by keyword.