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.