"Services or tools that don't require a separate API key" matching MCP connectors:

Neutral freight reference + validation layer for AI agents: ADR, HS, UN/LOCODE, freight math

Search real hotels, get live per-night quotes, and check out — all in chat. Guest search and checkout-link tools need no sign-in; OAuth unlocks saved trips, booking management, and one-click checkout. Renders interactive results, hotel-detail, and checkout widgets.

Bespoke cricket travel specialist with two decades of experience. Search tours, explore destinations, check match schedules, and submit enquiries. Covers IPL, Ashes, World Cups across India, South Africa, Australia, Sri Lanka, Bangladesh, and the West Indies. AI-powered, no authentication required.

AI-powered eSIM recommendation agent for travelers. Provides real-time coverage checks, package search by country, and pricing across 190+ destinations via structured tool calls. Tools available: - list_countries - full list of supported destinations - check_coverage - network operators by country code - search_packages - filter eSIM plans by country - get_package_details - pricing and data specs - create_checkout - generate payment link for purchase No auth required for search tools. Ideal

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

Turn a trip planned in conversation into a private, editable map link you hand the person.

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

In-flight WiFi: provider by flight, airline or tail, measured speeds, Starlink rollout.

US tariff & trade truth: duty actually paid by origin/HS 2017+, HTS rulebook, CBP rulings. No key.

Verified CO2e for any transaction, activity, flight, shipment or CBAM import. 200+ countries.

Consumer hotel search, live rates, booking, order management, and payment via TourMind.

Search 18000+ verified restaurants and bars across 20 cities, each with a 0-100 Quality Score, venue detail, curated lists and Trip Saving

Walk Score MCP — wraps the Walk Score API (walkscore.com)

SEPTA MCP — Philadelphia SEPTA real-time transit (www3.septa.org/api, keyless)

Duffel MCP — live flight search + pricing via the Duffel Flights API (duffel.com)

OpenSky MCP — OpenSky Network API (free, no auth for anonymous access)

iRail MCP — Belgian rail (SNCB/NMBS) real-time via the community iRail API

Citybikes MCP — wraps CityBik.es API (free, no auth required)

The world railway atlas as MCP tools: 744+ legendary train routes, night trains, journey times.

Swiss Transport MCP — wraps Transport Open Data API (free, no auth)