"How to Connect to a PostgreSQL Database" matching MCP connectors:

Open AI Visibility Index for crypto and Web3. Weekly share-of-answer measurements for 24 tracked brands across ChatGPT, Perplexity and Gemini, from a frozen versioned prompt panel. Five read-only tools: full index, per-brand lookup, brand list, complete measurement history and methodology. No auth, no API key. Data is CC BY 4.0 with a permanent archive of every weekly snapshot, so any figure can be verified independently.

Open AI Visibility Index for SaaS and AI tools. Weekly share-of-answer measurements for 20 tracked brands across ChatGPT, Perplexity and Gemini, from a frozen versioned prompt panel. Five read-only tools: full index, per-brand lookup, brand list, complete measurement history and methodology. No auth, no API key. Data is CC BY 4.0 with a permanent archive of every weekly snapshot, so any figure can be verified independently.

Search and compare attributed recipe records through a public read-only remote MCP endpoint.

One MCP endpoint over 69 public PPN APIs: search_apis to discover, execute_api to call. Free tier.

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.

Visa & entry requirements for 199 passports, cited to official sources and re-verified daily.

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.

What a stock price is betting on: implied growth, duration, and margin, read from SEC filings.

Verify a US business is real and who controls it. 30.9M state registry records.

Japanese law, corporation & statistics data as MCP, normalized to English with source attribution.

Hardware end-of-life dates by part number, each linked to the vendor's own bulletin.

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

National Bank of Romania (Banca Naţională a României, BNR) FX reference rates MCP. Keyless.

Kolada (RKA) MCP — Sweden's municipal & regional key-performance-indicator (KPI) database.

Bank of England Interactive Statistical Database (IADB) MCP.

Query 4,300+ ranked metros across sixteen dimensions: profiles, search, and head-to-head comparisons

African govt data, cited to source: rates, VAT, tax, wages, holidays, FX. 34 countries; Ghana free.

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