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Japan Price Alert MCP Server

Developer ToolsUse Caution3.5MCP RegistryLocal

Free

Server data from the Official MCP Registry

Price change alert MCP. Apify: apify.com/fruitful_quintessence Gumroad: atushi5.gumroad.com/l/kutuxe

About

Price change alert MCP. Apify: apify.com/fruitful_quintessence Gumroad: atushi5.gumroad.com/l/kutuxe

Security Report

3.5

Use Caution3.5High Risk

The server has no authentication and no ownership checks, so any caller can read, modify, or delete any watch by id, and user_id is caller-supplied. The main code risk is that fetch_price passes caller-supplied URLs to urllib without restricting the scheme, so file:// URLs can read local files and return extracted title text, and the webhook and fetch paths can reach internal hosts. Otherwise the code is clean: the SQL is parameterized, the update allowlist is enforced, there are no hardcoded secrets, and the dependencies are minimal. Supply chain analysis found 3 known vulnerabilities in dependencies (1 critical, 1 high severity).

12 files analyzed · 11 issues found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.

Permissions Required

This plugin requests these system permissions. Most are normal for its category.

HTTP Network Access

Connects to external APIs or services over the internet.

File System Read

Reads files on your machine. Normal for tools that analyze or process local data.

File System Write

Writes or modifies files on your machine. Check that this is expected for the tool.

database

Check that this permission is expected for this type of plugin.

env_vars

Check that this permission is expected for this type of plugin.

How to Install

Add this to your MCP configuration file:

{
  "mcpServers": {
    "io-github-atushi1841-japan-price-alert-mcp": {
      "args": [
        "japan-price-alert-mcp"
      ],
      "command": "uvx"
    }
  }
}

Documentation

From the project's GitHub README.

japan-price-alert-mcp

Japanese EC price-change monitoring and notification MCP server for AI agents.

Overview

Monitor product prices across major Japanese e-commerce platforms (Mercari, Yahoo Auctions, Rakuten, SUUMO, Kakaku.com) and receive instant alerts on price drops.

Built on the Kensho project's price monitoring engine.

Platforms

Mercari Japan (メルカリ) - jp.mercari.com
Yahoo! Auctions / Shopping (ヤフオク) - auctions.yahoo.co.jp, shopping.yahoo.co.jp
Rakuten Ichiba (楽天市場) - item.rakuten.co.jp
SUUMO (SUUMO) - suumo.jp
Kakaku.com (価格.com) - kakaku.com
Suruga-ya (駿河屋) - suruga-ya.jp

Tools

Tool	Description
`create_price_watch`	Register a new product URL for price monitoring
`list_price_watches`	List all registered watches
`get_price_watch`	Get details of a specific watch
`update_price_watch`	Update watch parameters (target price, interval, etc.)
`delete_price_watch`	Remove a watch
`check_price_watch`	Force immediate price check
`run_due_price_checks`	Batch check all due watches
`get_price_history`	Get historical price data
`detect_platform_url`	Detect platform from URL

Installation

Smithery (Recommended)

npx @smithery/cli install atushi1841/japan_price_alert_mcp

Manual

# Clone or extract the MCPB bundle
# Configure in your MCP client:
{
  "servers": {
    "japan-price-alert-mcp": {
      "command": "uv",
      "args": ["run", "--directory", "/path/to/bundle", "src/stdio_main.py"]
    }
  }
}

Configuration

Environment Variable	Description	Default
`PRICE_WATCH_DB`	Custom SQLite database path	`<bundle>/data/price_watch.db`
`TELEGRAM_BOT_TOKEN`	Telegram bot token (for notifications)	-
`TELEGRAM_CHAT_ID`	Telegram chat ID (for notifications)	-

Usage Examples

// Create a price watch
const result = await mcp.callTool("create_price_watch", {
  user_id: "user123",
  url: "https://www.mercari.com/us/item/m123456789/",
  target_price_jpy: 5000,
  notification_channel: "telegram",
  notification_destination: "123456789",
  check_interval_minutes: 30
});

// Check a specific watch
const check = await mcp.callTool("check_price_watch", {
  watch_id: "pw_abc123"
});

// List all watches
const list = await mcp.callTool("list_price_watches", {
  user_id: "user123"
});

Alert Conditions

lte (default): Alert when price <= target_price_jpy
any_drop: Alert on any price decrease
percent_drop: Alert when price drops by >= drop_percentage%
in_stock: Alert when item comes back in stock

Notification Channels

log (default): Log to stderr
telegram: Send to Telegram bot (requires token + chat_id)
webhook: POST to specified URL
email: Log email alert (SMTP not implemented)

Dependencies

Python >=3.10
fastmcp >=3.0.0
stdlib only for scraping (no external dependencies beyond fastmcp)

License

MIT

Author

atushi1841

Data & Store

Apify Store: https://apify.com/fruitful_quintessence
Gumroad datasets: https://atushi5.gumroad.com/l/kutuxe

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