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Check Digit Validator

Official registry Other

Validates IBAN/ISBN/EAN/Luhn checksums and finds the one wrong digit

Source code Website

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http check-digit-validator 'https://check-digit.gumballtools.com/api/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "check-digit-validator": {
            "type": "http",
            "url": "https://check-digit.gumballtools.com/api/mcp"
        }
    }
}

Frequently asked questions

What is Check Digit Validator?

Validates IBAN/ISBN/EAN/Luhn checksums and finds the one wrong digit

How do I install Check Digit Validator?

It runs as a remote server. In Claude Code: claude mcp add --transport http check-digit-validator 'https://check-digit.gumballtools.com/api/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Check Digit Validator need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is Check Digit Validator open source?

Its code is public on GitHub, but the repository does not declare a standard license.

Who maintains Check Digit Validator?

It is published by bwalvoord. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.