Flex by Lempart
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Developers

Travel eSIM plans for AI assistants (MCP server)

Assistants that speak the Model Context Protocol can search our plans, read one in full and send the traveller to the page that sells it, at the shop’s own price.

Connect

Server address
https://lempart.app/mcp
Transport
Streamable HTTP, protocol 2025-06-18, JSON-RPC 2.0 over POST

Any MCP client connects with the server address alone — no key, no account, no session. Public catalogue data only; no customer data passes through it.

Tools

  • search_plans(destination, days, unlimited?, limit?)

    Plans on sale for a destination — a country name or code; several with commas find plans covering all of them — and a trip length, cheapest first, at the exact checkout price in USD.

  • get_plan(id)

    One plan in full: price, validity, data, speed after the daily amount, hotspot, networks, exit IP and the page that sells it.

  • start_checkout(id)

    The page that sells this exact plan, already chosen. The traveller pays there; nothing is charged inside the assistant.

Try it

curl -s https://lempart.app/mcp \
  -H 'content-type: application/json' \
  -H 'accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call",
       "params":{"name":"search_plans",
                 "arguments":{"destination":"Japan","days":10,"unlimited":true}}}'

For partners

Building your own assistant on it? Use https://lempart.app/mcp?ref=YOURCODE and every link it returns carries your code, so the sales are credited to you. The partner program.

The rest of what we publish for developers — the plan feed and the catalogue API — is on the developers page.