Koskamo

Japan Data MCP

An MCP server providing 28 tools for AI agents to access Japanese data APIs, including address normalization, furigana conversion, real-time transit, National Diet records, holidays, weather, and corporate registry lookups. It utilizes the x402 protocol for pay-per-call USDC payments without requiring API keys or signup.

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Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Japan Data MCP logo, by mametaCommunity listingLocal stdioSource reviewed; not executedPublished by mameta
You need:No API keys. No signup.
Vendor documentation

What you can do with it

  • Normalize and geocode Japanese addresses
  • Convert Kanji to furigana and romaji
  • Check real-time train delays and plan routes
  • Search National Diet members and minutes

Source and maintenance

Community listingRegistry 1.1.0
mcp-registry: io.github.Mameta29/japan-data-mcp@1.1.0Source repositoryProject website
Maintenance checked

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

@mameta/japan-data-mcp 1.1.0

npm
@mameta/japan-data-mcp package definition
{
  "version": "1.1.0",
  "transport": "stdio",
  "identifier": "@mameta/japan-data-mcp",
  "registryType": "npm",
  "registryBaseUrl": "https://registry.npmjs.org",
  "environmentVariables": [
    {
      "name": "EVM_PRIVATE_KEY",
      "format": "string",
      "description": "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."
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before 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.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.
Cursor configuration
{
  "mcpServers": {
    "japan-data-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mameta/japan-data-mcp@1.1.0"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<YOUR_EVM_PRIVATE_KEY>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "japan-data-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mameta/japan-data-mcp@1.1.0"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<YOUR_EVM_PRIVATE_KEY>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.
VS Code configuration
{
  "servers": {
    "japan-data-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@mameta/japan-data-mcp@1.1.0"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<YOUR_EVM_PRIVATE_KEY>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.
Claude Desktop configuration
{
  "mcpServers": {
    "japan-data-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mameta/japan-data-mcp@1.1.0"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<YOUR_EVM_PRIVATE_KEY>"
      }
    }
  }
}

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