"Exploring Gemini Services or Tools That Don’t Require an API Key" matching MCP connectors:

Official MCP server for SupplyGraph.AI. Exposes supply-chain agents as tools: company search, tariff calculation, enterprise-change monitoring, and risk prediction. Auth: Authorization Bearer API key from Console → Developer Settings → A2A/MCP Keys.

IPStack MCP Adapter turns IPStack's REST APIs into Model Context Protocol tools so any MCP-compatible client can call them directly in conversation. The first release ships IPStack IP geolocation and security lookups (single IP, caller's IP, and bulk). Additional APILayer services are added by registering them in a single config file, so the catalog grows without client-side changes.

Check shipping costs for all logistics services in Indonesia.

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.

Shared memory for AI agents. One address per fact, one signature you check. No key to read.

Swiss weather data for AI assistants — forecasts, measurements, stations, pollen.

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.

31 tools: geocoding, weather, FX, SEC, DNS, more. Missing data named, unbilled. $0.001-$0.003/call.

Analyse cycling-event GPX routes and build bounded, practical ride-fuelling carry plans.

Verified Hamptons & North Fork data: open now, events, beaches, permits, closures.

Returns the postal code (CEP) and standardized address from the Brazilian Post from a given address.

Real-world tasks in Hamburg: quote, check service area, submit an enquiry for human review.

Dutch address dossier, vehicle, building, elevation, holidays, demographics. Free samples first.

Gwinnett County, GA zoning and land use. Resolves an address to its governing jurisdiction.