# WillItPlug > Whether a traveller's plugs fit at their destination, and the plug types, voltage and frequency of 242 countries and territories. Free to use; please credit WillItPlug with a link. ## For agents - [MCP server](https://will-it-plug.vercel.app/mcp/): Streamable HTTP, no key. Tools: check_trip(from, to) and country_plugs(country). - [OpenAPI description](https://will-it-plug.vercel.app/api/v1/openapi.json): the JSON API below. - [Developer docs](https://will-it-plug.vercel.app/developers/) ## JSON API (no key, CORS enabled) - [All countries](https://will-it-plug.vercel.app/api/v1/countries.json) - One country: https://will-it-plug.vercel.app/api/v1/countries/{code}.json, e.g. [Japan](https://will-it-plug.vercel.app/api/v1/countries/jp.json) - A trip: https://will-it-plug.vercel.app/api/v1/trips/{from}/{to}.json, e.g. [United States to Japan](https://will-it-plug.vercel.app/api/v1/trips/us/jp.json) - [Plug and socket standards](https://will-it-plug.vercel.app/api/v1/plugs.json) ## Pages - [Plugs by country](https://will-it-plug.vercel.app/plugs/) - A trip page: https://will-it-plug.vercel.app/from/{from-slug}/to/{to-slug}/, e.g. [United States to Japan](https://will-it-plug.vercel.app/from/united-states/to/japan/)