How to Use the Luhn CC Validator MCP in Claude

Catch fake credit cards inside Claude Desktop before they hit your payment processor.

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Connect Luhn CC Validator MCP to Claude Desktop

Create your Vinkius account to connect Luhn CC Validator to Claude Desktop and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Luhn CC Validator with Claude Desktop

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Stop fake card numbers in Claude Desktop chats

The `validate_luhn` tool stops Claude Desktop from sending hallucinated credit card numbers to your payment gateways. Claude Desktop uses the local stdio transport to execute the algorithm on your machine as an MCP Server. You get immediate validation and brand detection for Visa, Mastercard, and Amex right in your chat window.

Real-time mathematical verification

By executing the standard mod 10 checksum, the `validate_luhn` tool validates credit card formats directly from your desktop interface. This verification catches typos and fake patterns before they ever reach your payment processor. Your agent can now run this pre-flight check during any development or testing session. No more manually copying numbers into web forms just to see if they are mathematically valid.

Automatic card brand detection

Identifying the card issuer based on standard bin patterns is handled directly by the `validate_luhn` tool. Claude Desktop displays whether the input is an Amex, Visa, or Mastercard automatically. This keeps your testing workflows accurate. Preventing misrouted test payments saves you debugging time when working with multi-brand gateways.

Setup guide

Set up Luhn CC Validator MCP in Claude Web or Desktop

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.
2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL: https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.
3

Start a conversation

Open a new chat. The Luhn CC Validator MCP tools are available immediately — no restart needed.

Endpoint URL

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

No configuration file needed — paste the URL directly in the Claude web interface.

Available on Free (1 connector), Pro, Max, Team, and Enterprise plans.

Prerequisites

Claude Desktop installed (macOS or Windows)
Active Vinkius subscription with a valid endpoint token

1

Open Claude Desktop Settings

Click the menu icon at the top-left corner, go to Settings → Developer → Edit Config. This opens claude_desktop_config.json in your default text editor.
2

Paste the Luhn CC Validator MCP configuration

Copy the JSON snippet on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Restart Claude Desktop

Close and reopen the application. Claude needs a full restart to load new MCPs — refreshing a conversation is not enough.
4

Verify the connection

Open a new conversation. Click the 🔌 icon at the bottom of the message input. You should see tools listed under luhn-cc-validator-mcp.

json

{
  "mcpServers": {
    "luhn-cc-validator-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

Get your connection token →

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Common questions about Luhn CC Validator MCP in Claude Desktop

Open your configuration file and add the server under your mcpServers block. Once you restart the desktop app, the validate_luhn tool will be available via the hammer icon in your chat input.

No, this MCP Server only performs mathematical validation. It checks if the number structure is valid using the mod 10 algorithm and identifies the brand. It does not contact banks or check account balances.

No, the server processes everything locally on your machine. Your credit card strings never leave your local environment, making it safe for testing sensitive formats.

Claude is great at writing code, but it cannot run mathematical checksums reliably in its head. This server provides the validate_luhn tool to give the desktop agent a reliable mathematical engine.

The server runs inside a secure local sandbox. It only processes the credit card string to run the checksum and immediately discards the memory, ensuring no card numbers are stored or logged.

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