"Free Graph and Network Visualization Tools (No API Key Required)" matching MCP servers:

Enables AI agents to call 16 small, deterministic, read-only tools over a free, no-auth remote streamable HTTP MCP endpoint, covering business idea scoring, price headroom, hotel OTA commissions, open-source SaaS swaps, ads policy notice risk, App Store 4.2 prechecks, and Japan trip planning. Each tool is also exposed as a plain JSON API with OpenAPI docs.

55+ pay-per-call tools for AI agents over MCP: live telemetry, blockchain/on-chain checks, environmental, transit, finance, and network utilities. No API key or signup — agents pay per request with x402 USDC micropayments (Base and Solana).

This MCP server provides accessibility risk assessment for Seoul subway trips, considering wheelchair, stroller, and other mobility constraints. It offers tools to check station facilities, elevator status, and calculates risk scores for routes based on a deterministic engine.

Real-time last-minute tour and activity booking across 18 suppliers in 15 countries via the OCTO open standard. Search available slots, create Stripe checkout sessions, and check booking status.

Enables realtime bus arrival queries, route and stop searches, nearby station lookups, and transit planning for Chelaile-supported cities through MCP tools.

MCP server providing access to Russian Railways ticket API, enabling train search, station lookup, and trip information.

Enables evidence-driven motor-carrier search, qualification, risk assessment, monitoring, and TMS integration directly from Claude Code and MCP clients.

Enables AI assistants to interact with the GoodPass API for searching products, retrieving details, checking availability, pricing, and managing orders.

Enables AI assistants to access South Korean tourism information via the official Korea Tourism Organization API, providing comprehensive search for attractions, events, food, and accommodations with multilingual support.

Enables AI assistants to search places and addresses, compute driving, walking, and kickboard routes, optimize waypoints, and calculate distance and time matrices. Results can be displayed as interactive maps within conversations.

Enables AI assistants to ask what aircraft are flying near a location, track a specific flight's live position, route, aircraft details and photo, and surface emergency-squawking or military aircraft. It exposes four tools (flights_near, track_flight, emergencies, military_aircraft) backed by merged volunteer ADS-B networks and a global snapshot.

MCP server that enables AI assistants to search for rental cars, query prices, and access map services using the AMAP API.

Search, localized specs (180 spec types across 19 categories), compare, and structured filters over 102k+ vehicle variants in 19 languages, from cars-data.com.

Enables travel agents to manage the full trip-quoting lifecycle, including searching flights and accommodations, building personalized itineraries, checking entry requirements and cancellation policies, creating and monitoring bookings, and getting upsell recommendations.

Enables finding the cheapest flight destinations from an airport as structured JSON, with bargain detection via typical price comparisons and booking links.

Enables AI clients to search Tripadvisor hotels, restaurants, and attractions and fetch full review streams through the Apify MCP server. Integrates with Claude, ChatGPT, Cursor, and other tools via natural language.

Provides live hotel room rates, availability, and guest reviews from Agoda, enabling searches by destination and dates, property details, and structured review data.

Lets any MCP-compatible AI agent search live resort inventory, request exact all-in quotes including transfers, and start real hotel bookings that the traveler completes on a hosted Stripe checkout.

Quotes Australian domestic and outbound international parcel postage from two independent sources in a single call, resolves postcodes to suburbs and states, and calculates the volumetric weight carriers actually bill on. Every quote carries its pricing basis, and results are never ranked across currencies when no exchange rate is available.

Enables real-time one-way and round-trip flight searches from any MCP client without an API key or account, returning live fares, historical price insights, and bookable links supported by disclosed sponsored cards.