CUSIP/ISIN Validator — Security Identifier Validation

Created By
easysolutions9063 months ago
Validate and parse CUSIP and ISIN security identifiers using official checksum algorithms. Pure computation, no external dependencies. Used by trading platforms, portfolio tools, and fintech.
Overview

MCP CUSIP/ISIN Server

A Model Context Protocol (MCP) server for validating and parsing CUSIP and ISIN security identifiers using check digit algorithms.

Tools (4 total)

ToolDescription
cusip_validateValidate a 9-character CUSIP using the Luhn-variant check digit algorithm
cusip_parseParse a CUSIP into issuer code, issue number, and check digit
isin_validateValidate a 12-character ISIN using the Luhn algorithm
isin_parseParse an ISIN into country code, NSIN, and check digit (extracts embedded CUSIP for US/CA)

Install

npx @easysolutions906/mcp-cusip-isin

Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "cusip-isin": {
      "command": "npx",
      "args": ["-y", "@easysolutions906/mcp-cusip-isin"]
    }
  }
}

Cursor

Add to .cursor/mcp.json:

{
  "mcpServers": {
    "cusip-isin": {
      "command": "npx",
      "args": ["-y", "@easysolutions906/mcp-cusip-isin"]
    }
  }
}

REST API

Set PORT env var to run as an HTTP server.

  • GET /cusip/validate?cusip=037833100 -- validate a CUSIP
  • GET /cusip/parse?cusip=037833100 -- parse CUSIP into components
  • GET /isin/validate?isin=US0378331005 -- validate an ISIN
  • GET /isin/parse?isin=US0378331005 -- parse ISIN into components
  • POST /validate/batch -- batch validate multiple CUSIPs and ISINs

Data Source

Pure algorithm -- no external dataset required. CUSIP uses a Luhn-variant checksum; ISIN uses standard Luhn over letter-to-number conversion.

Transport

  • stdio (default) -- for local use with Claude Desktop and Cursor
  • HTTP -- set PORT env var to start in Streamable HTTP mode on /mcp

Server Config

{
  "mcpServers": {
    "cusip": {
      "command": "npx",
      "args": [
        "-y",
        "@easysolutions906/mcp-cusip-isin"
      ]
    }
  }
}
Project Info
Created At
3 months ago
Updated At
3 months ago
Author Name
easysolutions906
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