CUSIP/ISIN Validator — Security Identifier Validation

Created By

easysolutions9065 days 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.

# cusip

# isin

Overview Content Tools Comments

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)

Tool	Description
`cusip_validate`	Validate a 9-character CUSIP using the Luhn-variant check digit algorithm
`cusip_parse`	Parse a CUSIP into issuer code, issue number, and check digit
`isin_validate`	Validate a 12-character ISIN using the Luhn algorithm
`isin_parse`	Parse 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"
      ]
    }
  }
}

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