---
title: "Check Digit Validator"
canonical: https://penguindriver.com/s/com.gumballtools%2Fcheck-digit
markdown: https://penguindriver.com/s/com.gumballtools%2Fcheck-digit.md
retrieved: 2026-09-28
language: zh-Hant-TW
content_sha256: 1480b1685726d1e168c1fafb806dcc00a7991145217e45d19bca946f87069b37
cite: https://penguindriver.com/cite?path=%2Fs%2Fcom.gumballtools%252Fcheck-digit
sources:
  - https://check-digit.gumballtools.com/api/mcp（streamable-http）
  - https://github.com/bwalvoord/gumball
---

# Check Digit Validator

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

- 名稱：com.gumballtools/check-digit
- 版本：0.1.0
- 遠端：https://check-digit.gumballtools.com/api/mcp（streamable-http）
- 套件：—
- 原始碼：https://github.com/bwalvoord/gumball
- 分類：開發工具

---
MCP 伺服器資料來自官方 MCP Registry；付費 API 來自 x402 Bazaar。網頁版：https://penguindriver.com/s/com.gumballtools/check-digit

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