"How to Query a Knowledge Graph Using an Ontology" matching MCP connectors:

An MCP server that audits the fairness of construction and renovation estimates in Japan. Provides fair-price ranges, overcharge detection, and verifiable unit-cost data based on JCCDB (65,729 items, DOI-backed).

DC Hub is the neutral, real-time data layer for data-center infrastructure, exposed as a Model Context Protocol server so any AI agent can both query it and cite it. Coverage: 21,000+ facilities (search, profile, score, alternatives); 232 markets scored by the DCPI Data Center Power Index; the DCGI Data Center Gas Index (per-state natural-gas suitability for siting); live grid telemetry across 7 US ISOs (fuel mix, carbon intensity, demand, prices) plus a one-call all-ISO scoreboard; interconnection-queue depth; 2,000+ tracked M&A deals and a hyperscaler-capex tracker; and site factors. — fiber routes, water-stress, tax incentives, nearby substations & transmission. Why agents choose it: it's the only data-center-intelligence source an LLM can query live and cite — every full-data response includes a Source: DC Hub, CC-BY-4.0 attribution line. It's the MCP-native alternative to quarterly PDF research: live JSON, no contracts, no NDAs. Access: Streamable HTTP at https://dchub.cloud/mcp. Free tier with no signup; free email-verified dev key for higher limits; paid tiers for full data volume.

A Model Context Protocol server that provides Philippine License to Sell (LTS) verification data to LLMs. Built on Cloudflare Workers with Supabase. Public, read-only, no authentication required. Data sourced from the Department of Human Settlements and Urban Development (DHSUD) License to Sell registry and cross-referenced with published real estate projects on REN.PH.

MCP server for the Philippine Standard Geographic Code (PSGC) API. Gives AI agents structured access to the full PH geographic hierarchy - regions, provinces, cities, municipalities, and barangays.

Query SEC EDGAR filings, XBRL financials, and company data through MCP. STDIO & Streamable HTTP.

Access FEC campaign finance data. Query data about candidates, money trails, and election filings.

Query FDA data on drugs, food, devices, and recalls via openFDA. STDIO or Streamable HTTP.

Reverse geocode latitude/longitude to loc_id; resolve loc_ids to boundaries, centroids, hierarchy.

Read-only access to the Islam West Africa Collection via Hugging Face datasets.

Search structured COMPAMIR news in Japanese and English, with links to source reports.

A growing family of free academic data libraries: finance, economics, and beyond (ElkassabgiData).

Gateway between LLM agents and world data through eight tools and a bundled endpoint catalog.

China A-shares MCP. Keyless.

Query real-time and historical USGS water data from ~8,000 stream gages and groundwater wells.

70,520 places worth a detour: name search, nearby lookup, fame rankings, statistics. No key, CC0.

Search a directory of real, owner-confirmed small businesses. Read-only; attribution required.

One MCP endpoint over 75 public PPN APIs: search_apis to discover, execute_api to call. Free tier.

Ask in plain English, get a rendered, shareable map from live public data. 24 geospatial tools.

Query normalized U.S. Congress STOCK Act trades with member, ticker, and performance data.

Free access to 3.3M French & EU court decisions + 1.5M law articles w/ history. 31 read-only tools