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Check Digit Validator

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

Links

RepositoryDocumentation

Config for your environment

Use the endpoint URL below in your config. No API key — you connect directly.

Tool

OS

Config file: ~/.cursor/mcp.json

{
  "mcpServers": {
    "mcp-server": {
      "url": "https://check-digit.gumballtools.com/api/mcp"
    }
  }
}

Paste into mcpServers in the config file. Restart Cursor after saving.

If this MCP is also published on mcpchannel.ai, you can subscribe from Browse and use the gateway config there instead.