Japan Data MCP Server

by mameta29io.github.Mameta29/japan-data-mcpv1.1.0

30 tools for Japanese data: address, furigana, transit, Diet, holidays, weather, corporate registry

2Node.jsstdioofficial registry

context tax

queued

security

queued

cold start

queued

freshness

Maintained3mo ago

Install Japan Data MCP server

claude mcp add japan-data-mameta29 -e EVM_PRIVATE_KEY='<evm-private-key>' -- npx -y @mameta/japan-data-mcp

{
  "mcpServers": {
    "japan-data-mameta29": {
      "command": "npx",
      "args": [
        "-y",
        "@mameta/japan-data-mcp"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<evm-private-key>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "japan-data-mameta29": {
      "command": "npx",
      "args": [
        "-y",
        "@mameta/japan-data-mcp"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<evm-private-key>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "japan-data-mameta29": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@mameta/japan-data-mcp"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<evm-private-key>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "japan-data-mameta29": {
      "command": "npx",
      "args": [
        "-y",
        "@mameta/japan-data-mcp"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<evm-private-key>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
EVM_PRIVATE_KEY	—	yes	Private key of a USDC-funded wallet used to pay per-call x402 fees. Optional: without it the server starts and lists all tools, but paid tool calls return a 'payments disabled' error.

Freshness

Maintained — last maintenance signal 3mo ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-07-22 · 3mo ago · GitHub
Latest release
no data · GitHub
Package published
no data · npm/PyPI
Registry entry updated
2026-07-07 · 3mo ago · official registry · v1.1.0

FAQ

›How do I install the Japan Data MCP server in Claude Code?

Run: claude mcp add japan-data-mameta29 -e EVM_PRIVATE_KEY='<evm-private-key>' -- npx -y @mameta/japan-data-mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Japan Data require an API key?

Yes. It expects EVM_PRIVATE_KEY, of which 1 is a secret.

›Can I use Japan Data as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is Japan Data in the official MCP registry?

Yes, as io.github.Mameta29/japan-data-mcp.