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Check Digit Validator
com.gumballtools/check-digit · v0.1.0
Measured by MCP Station
| Last check | Reachable |
|---|---|
| Checked at | — |
| Check success 7 / 30 days | — |
| First-try success 30 days | — |
| Median response | — |
| Lookups 30 days | — |
| Authentication | No auth |
| MCP version | 2025-06-18 |
| Rank score | — |
| Declared risk | Read-only (all tools declare readOnlyHint) |
| Capabilities declared | tools |
| Tool definitions | 1 tools · with description 100% · input schema is an object 100% · read/destructive hints 100% |
Description written by the publisher, not verified
Validates IBAN/ISBN/EAN/Luhn checksums and finds the one wrong digit
Connect
streamable-http · https://check-digit.gumballtools.com/api/mcp
claude mcp add --transport http check-digit https://check-digit.gumballtools.com/api/mcp{
"mcpServers": {
"check-digit": {
"url": "https://check-digit.gumballtools.com/api/mcp"
}
}
}Tools as reported by the server
runValidate the check digit(s) on an IBAN, ISBN-10, ISBN-13, EAN-13, UPC-A, or Luhn-checked card number, and when it fails, try to say which digit is wrong. Use this instead of computing the checksum yourself. Mod-97 arithmetic on a rearranged 15-34 character IBAN, or a weighted sum mod 10/11 over 10-1
Repository · Website · JSON · Text for agents · Registry updated 2026-09-05