"Examples of MCPs (Microservices Communication Protocols) That Do Not Require API Keys" matching MCP connectors:

Official MCP: continuous supply-chain risk monitoring and early warning, not a one-off report. Register and create a key at https://supplygraph.ai/zk_chat_os/dashboard/dashboard.html — if you are not signed in you will be redirected to login; new users can register there. After login, open A2A / MCP and click Create Production Key or Create Sandbox Key. Send the header as Bearer <api_key> (one Bearer prefix, then the raw key). Optional for initialize and tools/list; required for tools/call.

AI-readable directory + commerce layer: 3,500+ SEA businesses, plus products from verified stores.

City geocoding and timezone resolution for birth data, for AI agents, one API key.

Search thousands of verified US local service providers across 10 home-services trades, including crawl space repair, floor coating, radon mitigation, commercial electrical, and laundry services. Returns ratings, services, pricing, descriptions, and profile links. Every result passes a completeness gate, so listings are never half-empty.

US crime scores, incidents, neighborhood demographics, rent data, and offender search by address.

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.

Generate styled PNG/SVG map images of any location with 11 customizable color themes.

Directory and marketplace of local businesses and independent professionals near you.

Directory and marketplace of local businesses and independent professionals. Find who does a job near a user, see ratings and prices, and get a direct link to request a quote and pay. Two tools: search_providers finds businesses by what they do (Spanish or English, resolves synonyms, optional lat and lng) and get_business returns one business detail: services, ratings, product catalog with prices, and the quote-and-pay link. Stateless streamable-http, no auth.

Human-verified directory of non-alcoholic bars: 1,500+ venues in 70 cities, rated and re-checked.

Search real businesses, then read profiles, services and hours or contact them, in one endpoint.

Lviv public transport MCP: stops, timetables, routes, and live vehicle positions. No API key.

Free solar & home energy tools: estimates, incentives by ZIP, scores, installer routing.

The discovery engine for the real world: byways, lookouts, places, drives. Zero hallucinations.

Correios: CEP, official-source lookup. Platform-hosted, pay per query with prepaid credit.

SEFAZ: Cadastro Centralizado de Contribuinte (CCC), official-source lookup. Platform-hosted, pay per

Prefeitura SP São Paulo: Caixa Postal, official-source lookup. Platform-hosted, pay per query with p

INCRA SIGEF: Parcelas, official-source lookup. Platform-hosted, pay per query with prepaid credit.

AI access to Mapbox docs, API references, style specs, and guides. No token required.

Correios: Completa CEP (CEP + Área territorial brasileira), official-source lookup. Platform-hosted,