Use co:sim with your AI assistant

Connect co:sim to Claude, ChatGPT, or any MCP-compatible agent — then just ask it to find and buy the right travel eSIM for your trip.

MCP server endpoint

https://cosim.io/mcp

No account, no API key. Payment always happens on cosim.io — your AI never touches your card.

Claude (claude.ai / Desktop)

  1. Open Settings → Connectors
  2. Click "Add custom connector"
  3. Paste the endpoint URL above and save
  4. Try: "Find me an eSIM for 7 days in Japan"

ChatGPT

  1. Enable developer mode in Settings → Apps & Connectors
  2. Add a new connector with the endpoint URL above
  3. Ask ChatGPT to find you a travel eSIM

Cursor, Zed & other MCP clients

Add this to your MCP client configuration:

{
  "mcpServers": {
    "cosim": {
      "url": "https://cosim.io/mcp"
    }
  }
}

What your AI can do

  • Search 190+ destinations and compare data plans
  • Get trip-based recommendations (countries + days + usage)
  • Create a secure checkout link — you review and pay on cosim.io
  • Check order status after purchase

Safe by design

  • Your AI only creates a checkout link — payment happens on this site via Stripe
  • Checkout links expire after 30 minutes if unused
  • Uninstalled eSIMs are refundable within 30 days

For developers

Prefer raw HTTP? The same capabilities are available as a REST API with an OpenAPI spec.

OpenAPI·llms-full.txt·Data Only