CUSIP/ISIN Validator — Security Identifier Validation
About
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.
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Setting up with Highlight
This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:
- Download and install Highlight from highlightai.com/download
- Navigate to the plugins tab and select "Add Custom Plugin"
-
Configure the plugin with the settings below
Plugin Name
CUSIP/ISIN Validator — Security Identifier ValidationCommand (node, npx, python, etc.)Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
- Enable "Start Automatically" if you want the plugin to start when Highlight launches
From the repository
Install via npx @easysolutions906/mcp-cusip-isin. For local use with Claude Desktop or Cursor, add the configuration shown in the README to your claude_desktop_config.json or .cursor/mcp.json. Set the PORT environment variable to run as an HTTP server, then use endpoints like `GET /cusip/validate?cusip
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)
| 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) |
Claude Desktop / Cursor
Paste into your MCP client config file to install this server.
{
"mcpServers": {
"cusip/isin validator \u2014 security identifier validation": {
"cusip": {
"command": "npx",
"args": [
"-y",
"@easysolutions906/mcp-cusip-isin"
]
}
}
}
}McpServers
{
"cusip": {
"command": "npx",
"args": [
"-y",
"@easysolutions906/mcp-cusip-isin"
]
}
}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
``bash
npx @easysolutions906/mcp-cusip-isin
`
Claude Desktop
Add to your claude_desktop_config.json:
`json
{
"mcpServers": {
"cusip-isin": {
"command": "npx",
"args": ["-y", "@easysolutions906/mcp-cusip-isin"]
}
}
}
`
Cursor
Add to .cursor/mcp.json:
`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`Sign in to leave a review
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