Wattoku MCP MCP server

An official MCP server for Wattoku that allows AI agents to compare Japan's household fixed costs, including electricity, city gas, fiber optic, and mobile plans. It provides tools to search plans, simulate annual costs, compare detailed terms, and generate switch links, using primary data from utility companies.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by Meliorra

MCP endpoint (Streamable HTTP)

https://wattoku.meliorra.co/api/mcp

Vendor documentation

What you can do with it

Search for the cheapest electricity plans in a specific region
Simulate annual electricity costs based on monthly usage
Compare detailed terms of multiple utility plans
Generate application links for switching providers

Tools advertised by the last live check:

search_plans
simulate_cost
compare_plans
get_switch_link
search_hikari_plans
simulate_hikari_cost
compare_hikari_plans
switch_hikari_cost
search_gas_plans
simulate_energy_bundle
search_mobile_plans

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http wattoku-mcp https://wattoku.meliorra.co/api/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add wattoku-mcp --url https://wattoku.meliorra.co/api/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable wattoku-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "wattoku-mcp": {
      "url": "https://wattoku.meliorra.co/api/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "wattoku-mcp": {
      "type": "streamableHttp",
      "url": "https://wattoku.meliorra.co/api/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start wattoku-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "wattoku-mcp": {
      "type": "http",
      "url": "https://wattoku.meliorra.co/api/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http wattoku-mcp https://wattoku.meliorra.co/api/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "wattoku-mcp": {
      "url": "https://wattoku.meliorra.co/api/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "wattoku-mcp": {
      "serverUrl": "https://wattoku.meliorra.co/api/mcp"
    }
  }
}

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