Japan Data MCP

Name: Japan Data MCP
Author: Mameta29

by Mameta29version 1.1.0i★ –iRuns on your computer

Registry nameio.github.Mameta29/japan-data-mcp

Install

Overview

Description from the maker (original English)

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

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other
You need to fill in: EVM_PRIVATE_KEY

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: EVM_PRIVATE_KEY

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "japan-data": {
      "command": "npx",
      "args": [
        "-y",
        "@mameta/japan-data-mcp"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add japan-data --env EVM_PRIVATE_KEY=your-value -- npx -y @mameta/japan-data-mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "japan-data": {
      "command": "npx",
      "args": [
        "-y",
        "@mameta/japan-data-mcp"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "japan-data": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@mameta/japan-data-mcp"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

EVM_PRIVATE_KEY secret env
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.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account Mameta29, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 32715 servers in this category
Published to the registry more recently than 16% of the other 32715 servers in this category
Basic checks equal to or better than 100% of the other 32715 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Japan Data MCP safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: EVM_PRIVATE_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.1.0) reached the registry 4 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, First Sale Scout

Alternatives

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Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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Runs on your computer★ 440MITUpdated 14 months ago

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Remote Desktop Commander

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Runs in the cloud★ 211Updated 2 days ago

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First Sale Scout

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Playbooks and a 14-day checklist for founders winning their first paying customers.

Runs in the cloudUpdated today

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

japan-data-mcp

npm: @mameta/japan-data-mcp · MCP Registry: io.github.Mameta29/japan-data-mcp · transport: stdio

An MCP server that gives AI agents (Claude Desktop, Cursor, Cline, …) one-call access to the agentic-jp.com suite of Japanese data APIs. Every call is settled per-use over the x402 payment protocol — no account, no subscription, no API key.

What it covers — 28 tools across 7 APIs

API	Tools	What it does
address	`address_normalize`, `address_geocode`, `address_reverse_geocode`, `address_postal_code`, `address_parse`	Japanese address normalization, geocoding, postal-code lookup, free-form parsing
furigana	`furigana_convert`, `furigana_name_readings`, `furigana_classify`	Reading conversion, name readings, text classification
transit	`transit_station_status`, `transit_line_disruptions`, `transit_route_plan`, `transit_alternative_routes`, `transit_lines`, `transit_stations_search`	Real-time rail delays + delay-aware route planning (ODPT)
diet	`diet_member`, `diet_members_search`, `diet_minutes_search`	National Diet members and full-text proceedings search
holiday	`holiday_is_holiday`, `holiday_list`, `holiday_add_business_days`, `holiday_business_days_between`	Public holidays + business-day math
weather	`weather_forecast`, `weather_warnings`, `weather_areas`	JMA forecasts and warnings
houjin	`houjin_corporation`, `houjin_search`, `houjin_verify`, `houjin_kyb_report`	Corporate-number (法人番号) registry — 5.78M corporations, one-call KYB report

How payment works

x402 is a buyer-pays protocol. This MCP server holds your wallet and pays each API call transparently — the agent never sees a payment prompt. Calls cost roughly $0.001–$0.10 each (mostly sub-cent), settled in USDC on Base.

You fund a wallet with a small amount of USDC.
You set EVM_PRIVATE_KEY to that wallet's key.
The server pays as it goes; per-call cost is well under a cent for most tools.

Without EVM_PRIVATE_KEY the server still starts and lists every tool, but a paid tool call returns a clear "payment not configured" message — nothing is charged.

Security: the key in EVM_PRIVATE_KEY can spend that wallet's funds. Use a

dedicated wallet funded with only what you intend to spend — never a primary

wallet.

Setup

No install step — npx fetches and runs the server on demand.

Claude Desktop

Add to claude_desktop_config.json:

"mcpServers": { "japan-data": { "command": "npx", "args": ["-y", "@mameta/japan-data-mcp"], "env": { "EVM_PRIVATE_KEY": "0xYOUR_FUNDED_WALLET_KEY" } } } }

Without EVM_PRIVATE_KEY the server still starts and lists all 28 tools; the paid tools then return a clear "payments disabled" error instead of running. Add a USDC-funded wallet key to enable them.

Cursor / Cline

Point the MCP client at npx -y @mameta/japan-data-mcp with the same EVM_PRIVATE_KEY env var. Transport is stdio.

From source

git clone https://github.com/Mameta29/japan-data-mcp.git

cd japan-data-mcp npm install && npm run build

then point the MCP client at: node /abs/path/to/dist/index.js

Example prompts

Once connected, just ask the agent in natural language:

"「東京都千代田区丸の内1-1」を正規化して緯度経度も出して" — address_normalize + address_geocode
"Is tomorrow a public holiday in Japan? If so, when is the next business day?" — holiday_is_holiday + holiday_add_business_days
"山手線いま遅れてる?渋谷から東京駅までの代替ルートは?" — transit_line_disruptions + transit_alternative_routes
"Look up the corporation with corporate number 7010401056220" — houjin_corporation
"国会で「デジタル庁」がいつどの委員会で議論されたか調べて" — diet_minutes_search

Configuration

Env var	Required	Description
`EVM_PRIVATE_KEY`	for paid tools	Private key of a USDC-funded wallet (Base / Polygon). Paid tools are disabled if absent.

Development

npm run dev        # run from source with tsx

npm run typecheck # tsc --noEmit npm run build # compile to dist/

License

Apache-2.0

Japan Data MCP

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

First Sale Scout

README from the maker

japan-data-mcp

What it covers — 28 tools across 7 APIs

How payment works

Setup

Claude Desktop

Cursor / Cline

From source

then point the MCP client at: node /abs/path/to/dist/index.js

Example prompts

Configuration

Development

License