MCP server

CheckDigit

dev.workers.mike-tusa.checkdigit/checkdigit

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Offline check-digit validation for IBAN, BIC, EU VAT, GTIN/EAN/UPC and ISBN. Format check only.

Website

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

2

Token cost

About 423 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http checkdigit https://checkdigit.mike-tusa.workers.dev/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.checkdigit]
url = "https://checkdigit.mike-tusa.workers.dev/mcp"

Gemini CLI

{"mcpServers":{"checkdigit":{"httpUrl":"https://checkdigit.mike-tusa.workers.dev/mcp"}}}

Cursor

{"mcpServers":{"checkdigit":{"url":"https://checkdigit.mike-tusa.workers.dev/mcp"}}}

VS Code

{"servers":{"checkdigit":{"type":"http","url":"https://checkdigit.mike-tusa.workers.dev/mcp"}}}

Antigravity

agy mcp add checkdigit https://checkdigit.mike-tusa.workers.dev/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"checkdigit","server_url":"https://checkdigit.mike-tusa.workers.dev/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"checkdigit","server_url":"https://checkdigit.mike-tusa.workers.dev/mcp"}

Tools

• get_meta ~87 tokens
  Return the service version and build, supported IBAN and VAT countries, GTIN formats, the disclaimer and the current limits. Does not count as a check. Read-only. Same data as GET /v1/meta.
• validate_code ~336 tokens
  Check the format and check digits of one identifier: IBAN (ISO 13616, per-country length and layout), BIC/SWIFT (ISO 9362 format and country), EU VAT number (offline checksum, VIES not queried), GTIN/EAN-8/UPC-A/EAN-13/GTIN-14 (GS1 mod 10) or ISBN-10/13. type "auto" (default) detects the type from t

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Badge for your README

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