Yes, Serialhunt is free to use.

How do I install Serialhunt?

Serialhunt is a remote plugin. You do not need to install anything locally. Add the server URL to your AI app's MCP configuration and you are ready to go.

Is Serialhunt safe to use?

Yes. Serialhunt passed MCP Marketplace's automated security scan with a score of 10/10 (low risk). Every server on MCP Marketplace is security-scanned before it's listed; see the full security report on this page for the findings and permissions.

What AI apps work with Serialhunt?

Serialhunt uses the Model Context Protocol (MCP) and works with any MCP-compatible AI app, including Claude, ChatGPT / Codex, Gemini, Copilot, Cursor, and more.

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Serialhunt MCP Server

by BigBalli

Developer ToolsLow Risk10.0MCP RegistryRemote

Free

Server data from the Official MCP Registry

US bill serial numbers: star note print runs and fancy serial patterns with exact odds.

About

US bill serial numbers: star note print runs and fancy serial patterns with exact odds.

Remote endpoints: streamable-http: https://bigballi.com/SerialHunt/mcp

Security Report

10.0

Low Risk10.0Low Risk

Valid MCP server (1 strong, 1 medium validity signals). No known CVEs in dependencies. Imported from the Official MCP Registry.

4 tools verified · Open access · No issues found

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

Permissions Found in Source Code

Found by scanning the linked source code. This listing connects to a hosted endpoint, so none of this runs on your machine: it describes what the server software does where it is hosted.

HTTP Network Access

Connects to external APIs or services over the internet.

How to Connect

Remote Plugin

No local installation needed. Your AI client connects to the remote endpoint directly.

Add this to your MCP configuration to connect:

{
  "mcpServers": {
    "com-bigballi-serialhunt": {
      "url": "https://bigballi.com/SerialHunt/mcp"
    }
  }
}

Documentation

View on GitHub

From the project's GitHub README.

SerialHunt for Claude and other MCP clients

Ask an AI assistant whether a US bill is worth keeping and get an answer from government production figures instead of memory: the star note print run a serial came from and how many notes shared it, every fancy pattern in the digits with its exact odds, and the rarest star runs to watch for.

This repository holds:

the connection details for the SerialHunt remote MCP server at https://bigballi.com/SerialHunt/mcp,
a Claude plugin that adds that server plus a paper-money-serials skill, which teaches Claude how to read the numbers.

The server is run by SerialHunt. Its star note figures come from the Bureau of Engraving and Printing's production reports, through the uspapermoney.info archive for Series 1963 to 2017A, and it updates weekly. The same answers are on the web lookup.

What you can ask

"I got a $1 bill with serial A 032 12345 ★, Series 2017A. Is it rare?"
"Is MB 123 45678 C on a $20 a fancy serial number?"
"Which $2 star notes had the smallest print runs?"
"What is a radar serial number, and how rare is it?"

Tools

All tools are read-only (readOnlyHint: true) and need no account.

Tool	What it answers
`check_serial`	One note from its serial: the Federal Reserve Bank, the series (worked out from the serial when it can be), every collector pattern in the digits with its odds, and for a star note the print run it came from, the notes printed and the rarity band.
`find_star_runs`	The 10 smallest star runs on record, optionally for one denomination, series or Federal Reserve Bank.
`list_serial_patterns`	The 17 fancy serial patterns, each strictly defined, with how many of the 100,000,000 possible serials match.
`get_coverage`	Which denominations and series the figures cover, the last update and any known gap.

SerialHunt gives no prices and makes no authenticity claims, on purpose.

Setup

Claude (claude.ai, Desktop, mobile)

Settings → Connectors → Add custom connector, then paste https://bigballi.com/SerialHunt/mcp. No sign-in is needed.

Claude Code

Install the plugin, which adds the server and the paper-money-serials skill:

/plugin marketplace add BigBalli/serialhunt-mcp
/plugin install serialhunt@serialhunt

Or add only the server:

claude mcp add --transport http serialhunt https://bigballi.com/SerialHunt/mcp

Other MCP clients

Any client that supports remote MCP servers over Streamable HTTP can use https://bigballi.com/SerialHunt/mcp with no credentials. The server speaks protocol versions 2026-07-28, 2025-11-25, 2025-06-18 and 2025-03-26 and answers with JSON (no SSE, no sessions).

Privacy

The server receives the tool name and its arguments (for example a serial number and a denomination), uses them to answer, and does not store them. It never sees your conversation or your account. Full policy: bigballi.com/SerialHunt/privacy.

Support

Email g@bigballi.com, or see bigballi.com/SerialHunt/connect.

License

The contents of this repository are released under the MIT License. The production figures served by the SerialHunt MCP server are not part of this repository.

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