@roamzy/mcp-server

MCP server for Roamzy — buy and manage a global eSIM through Claude Desktop, Cursor, Continue, Cline, Windsurf, Zed, or any other Model Context Protocol client. Anonymous flow by default: no account required to use it.

One eSIM for 192 countries. Pay per actual MB used. USDT or USDC on your preferred network. No packages. No expiry. No subscription.

What it does

This MCP server lets an agent (running in any MCP-compatible client) call the Roamzy HTTP API on the user's behalf. Sample conversation in Claude Desktop:

User: I'm going to Thailand for a week, buy me an eSIM.

Claude: Roamzy — one universal eSIM, works in 192 countries. Billed per MB at the local rate, no packages, no expiry. For Thailand the rate is ~$2.15/GB. Which stablecoin / network do you want to pay with? (USDT on TRON, BSC, Polygon, Optimism, Arbitrum, TON — or USDC on Solana, BSC, Polygon, Optimism, Arbitrum.) Minimum top-up is $20 USDT.

User: USDC on Solana, $20.

Claude: Order created. eSIM number 2040XXXXXX. Pay here: [pay-link]. After ~1 minute on Solana, I'll fetch your QR. ❗ Save this recovery URL so you can return to this eSIM from another Claude chat: [claim-link].

User pays $20 USDC.

Claude: Paid. Here's your activation QR — open Settings → Cellular → Add eSIM and scan it with your phone camera. [QR PNG attached]

The server doesn't run a backend itself — it's a thin client to https://roamzy.io/api/v1/*, mapped 1:1 to MCP tools.

Install

Add this to your MCP client's configuration (e.g. ~/Library/Application Support/Claude/claude_desktop_config.json for Claude Desktop on macOS):

{
  "mcpServers": {
    "roamzy": {
      "command": "npx",
      "args": ["-y", "@roamzy/mcp-server"]
    }
  }
}

Restart your MCP client. The first authed tool call will mint an anonymous Roamzy account automatically — no signup required.

Alternative: install from a hosted tarball

If you can't reach the npm registry, want to pin a pre-release, or prefer to fetch a specific version directly from Roamzy's CDN, swap the args to a URL:

"args": ["-y", "https://roamzy.io/mcp/roamzy-mcp-latest.tgz"]

Both forms run the same code — the npm registry path is the recommended default because it integrates with npm view, version pinning, and MCP registries (Smithery, modelcontextprotocol/servers, etc.).

Optional environment variables

Tools

Public (no auth required)

Account-scoped (anonymous or token)

Purchase (anonymous or token + ROAMZY_ENABLE_PURCHASE=true)

Each tool returns structured JSON. Tool descriptions (visible via tools/list) encode the agent contract — when to call each tool, what to surface to the user, what to keep internal.

Anonymous flow

When the MCP server starts without ROAMZY_API_TOKEN, the first authed call sends POST /api/v1/anon-session (no auth) to mint a fresh anonymous Roamzy account. The server caches the returned token in-process (never written to disk) and uses it for subsequent calls.

The response also includes a claim_url — a magic-link that lets the user later attach this anonymous account to a permanent Google or Telegram identity. Once attached, the eSIM, balance, and history become visible from /dashboard/esims on the web.

Important: the anonymous token lives only in this MCP server process. If the user closes their MCP client (e.g. quits Claude Desktop) without saving claim_url, the access path is lost — the eSIM itself keeps working, but the user can't see or manage it from a new session. The recovery procedure (operator-mediated via support) is described in the roamzy_support tool response.

Anonymous accounts have conservative daily / monthly spending caps and a cool-off period that gates large transactions; exact thresholds are shown to the user in the dashboard once they claim.

Security model

• No filesystem access. The server only makes HTTP calls.

• No child processes.

• No environment scan beyond explicit ROAMZY_* variables.

• Outbound traffic only to https://roamzy.io (override via ROAMZY_API_BASE if you self-host).

• Purchase tools are registered only in anonymous mode or with ROAMZY_ENABLE_PURCHASE=true.

• Per-token spending caps with cool-off period + big-transaction threshold; configurable per token in /dashboard/settings.

• Service status honoured. When roamzy_status reports purchases_paused=true, the agent must back off.

• No telemetry. The server doesn't phone home except to call the configured API base.

See SECURITY.md for the disclosure policy.

Build from source

git clone https://github.com/roamzy-io/mcp-server.git
cd mcp-server
pnpm install
pnpm build

Output: a single-file ESM bundle at dist/index.js (~520 KB, self-contained, executable via Node 20+).

To produce a tarball for distribution:

pnpm build:tgz
# → dist/roamzy-mcp-server-<version>.tgz

Links

• Website: https://roamzy.io

• API docs: https://roamzy.io/api/v1/docs

• For agents: https://roamzy.io/agents.html

• Long-form for AI engines: https://roamzy.io/llms-full.txt

• Support: @roamzy_support_bot or support@roamzy.io

• Security: roamzy.agent@gmail.com (SECURITY.md)

License

MIT — © 2026 Artur. The Roamzy name and brand are trademarks of the Roamzy service operator and are not licensed under MIT.