"How to obtain an API key" matching MCP servers:

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).

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

An AI-powered travel planning assistant that fetches live weather, generates packing suggestions, and provides travel recommendations.

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

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

Answers whether a route ran late and by how much, with drill-down into individual trip delays and an audit trail of data-quality exclusions and duplicate resolutions.

Provides tools for vehicle service search, mechanic matching, and booking generation as part of a multi-agent AI system for roadside assistance.

Live USPS, UPS, FedEx and DHL Express parcel rates from a US origin, domestic or to Canada, the UK, Germany and Australia, from a plain-words item description: no scale, no account, no API key. Also creates checkout links, reports checkout status, tracks parcels bought on smklog.com and serves a monthly US parcel price index.

Express-based API for Lviv transport timetable data with a read-only MCP endpoint.

Provides live California road conditions, route planning, and an AI assistant over MCP, enabling natural-language queries about traffic, closures, chain controls, and more.

Provides real-time fuel prices at gas stations in Spain using the government's public API. Enables users to find the cheapest fuel in a municipality or list stations sorted by price.

Enables querying SNCF train schedules and stations in France using the official Navitia API, with support for flexible date parsing and real-time journey planning.

Enables AI assistants to plan container and truck loads from plain-English shipment descriptions, returning fitted containers, utilization, non-fitting items, and interactive 3D load plans.

Enables LLMs to search and book flights across 300+ airlines, manage travel orders, and search airports through the Duffel API with support for real-time pricing, multi-city trips, and flexible cabin classes.

Enables AI agents to pack trucks and shipping containers by generating validated 3D load plans with metrics like LDM, linear feet, and pallet positions through the Hansatic packing API.

An MCP server that enables AI assistants to interact with the Netherlands Railways (NS) API for route planning, pricing, and real-time departure information. It provides tools for searching stations, planning trips with connections, and viewing real-time departure boards.

Provides AI assistants with access to real-time flight data, airport schedules, delays, and aviation reference databases through natural language queries.

Buy and manage a global eSIM through chat. One universal eSIM for 192 countries, per-MB billing in USDT or USDC across TRON, Solana, BSC, Polygon, Optimism, Arbitrum, TON. Anonymous-flow by default — no account required.

Persistent, shareable travel workspaces for AI agents. Build a complete itinerary as a private map link and hand it to the person — usable on their behalf where signup-walled travel tools are not. Six tools, no API key, no account. The trip rides in the link's fragment, so nothing is stored server-side. Hosted at https://thistripbtw.us/mcp — zero install — or npx thistripbtw-mcp over stdio.

An MCP server that lets users find nearby shops and POIs around a location and find targets such as gas stations or charging points within a given radius along a driving route, using the Amap (Gaode) Web Service API with built-in API key entry and validation.