Esim MCP server

esim-mcp

An MCP server for travel eSIM plans. It lets Claude, Cursor, and any other Model Context Protocol client search travel eSIM data plans by country, compare prices, and work out the cheapest way to stay connected across a multi-country trip.

Ask "what is the cheapest eSIM for two weeks in Japan and South Korea?" and get real plans with real prices, not a guess.

esim-mcp is built and maintained by CheapereSIM, and returns CheapereSIM pricing. It covers 190+ destinations across 8 regions.

What you can ask

Once installed, these all work in plain language:

• "What is the cheapest eSIM for Japan?"
• "I am travelling to Japan, South Korea and Taiwan for three weeks. What should I buy?"
• "Is there a single eSIM that covers all of Southeast Asia?"
• "Which countries does that regional plan actually cover?"
• "Show me unlimited data eSIM plans for Turkey."
• "How much data is left on my eSIM?" (needs a token)

The interesting one is the multi-country case. A regional eSIM that covers your whole trip is sometimes cheaper than buying a local eSIM in each country, and sometimes it is not. plan_trip prices both and tells you which wins.

Setup

Add this to your MCP client configuration:

{
  "mcpServers": {
    "esim": {
      "command": "npx",
      "args": ["-y", "esim-mcp"]
    }
  }
}

No API key, no account, and no configuration are required to search destinations and compare plans. Set CHEAPERESIMAPITOKEN only if you also want the two account tools.

Example: planning a multi-country trip

Asking plan_trip for three weeks across Japan, South Korea and Taiwan, with at least 10GB:

Option 1 - one plan covering everything, $34.58:
Asia (12 areas) 10GB 30Days: 10 GB for 30 days - $34.58 - covers 12 countries
  https://cheaperesim.com/multi-country-esim?package=2488&utm_source=mcp&utm_medium=ai&utm_campaign=esim-mcp

Option 2 - one local plan per country, $17.52 total:
Japan 10GB 30Days: 10 GB for 30 days - $8.76
  https://cheaperesim.com/esim/japan?package=339&utm_source=mcp&utm_medium=ai&utm_campaign=esim-mcp
South Korea 10GB 30Days: 10 GB for 30 days - $8.76
  https://cheaperesim.com/esim/south-korea?package=345&utm_source=mcp&utm_medium=ai&utm_campaign=esim-mcp
No local plan available for: TW.

Recommended: option 1, since option 2 does not cover: TW.

That is real output against live pricing, not an illustration. It is also the case worth understanding: buying local is half the price, and it is still the wrong answer, because Taiwan is sold only inside regional plans. A price comparison that stopped at the cheaper number would leave you without service for a third of the trip.

The server prints each buy_url exactly as the API returns it, so the links above are the ones you would get.

Tools

Shortened. The full README is on GitHub.