Dev tools · Official remote MCP server

The Check Digit Validator MCP server,
connected in one click.

Validates IBAN/ISBN/EAN/Luhn checksums and finds the one wrong digit. Connect the official Check Digit Validator MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.

Connect Check Digit Validator free How it works

Free to start · No credit card · No hosting needed

Use this server

Add Check Digit Validator to your AI in one minute

Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.

claude mcp add --transport http check-digit-validator https://check-digit.gumballtools.com/api/mcp

Run in your terminal, then restart Claude Code.

Check Digit Validator · https://check-digit.gumballtools.com/api/mcp

What you can do

What your AI can do with Check Digit Validator

Real prompts you can type the moment it's connected — no setup, no docs to read.

“Use “run”: Validate 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 di.”

Security check

How secure is the Check Digit Validator MCP server?

Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how Check Digit Validator holds up.

✓ Verified directory serverCheck Digit Validator · gumballtools.com

Official endpoint

Operated by Check Digit Validator (gumballtools.com) at its documented MCP endpoint — not a third-party mirror or community re-host.

No sign-in needed

This server only exposes public data — no account and no credentials are involved when you connect.

Scanned before it goes live

gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.

Watched for drift

If Check Digit Validator adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.

Run the free scanner on Check Digit Validator's server →

How it works

Connected in three steps

Connect your gate

Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.

Pick Check Digit Validator

Choose Check Digit Validator in the gate directory. No sign-in needed.

Use it anywhere

Check Digit Validator's tools are live in every AI client you've connected — with rules and logging built in.

Connect Check Digit Validator free

Free to start · No credit card · No hosting needed

Straight from the server

The actual tools Check Digit Validator exposes

Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.

run — Validate 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 di

Author

Who runs the Check Digit Validator MCP server?

gumballtools.com

Homepage More servers from gumballtools.com →

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Server facts

The Check Digit Validator MCP server at a glance

Endpointhttps://check-digit.gumballtools.com/api/mcp

Operated byCheck Digit Validator (gumballtools.com)

CategoryDev tools

Sign-inNone — public data only

Available in gateYes — one-click connect

Works withClaude, ChatGPT, Cursor & any MCP client

FAQ

Questions, answered

Is there an official Check Digit Validator MCP server?

Yes — Check Digit Validator operates its own remote MCP server at check-digit.gumballtools.com. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.

How do I connect Check Digit Validator to Claude or ChatGPT?

Add gate's gateway URL to your AI client once, then pick Check Digit Validator in the directory. No account or sign-in is needed. From then on, Check Digit Validator's tools are available in every client you've connected to gate.

Do I need to host anything?

No. Check Digit Validator runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.

Is the Check Digit Validator MCP server safe to connect?

It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.