MCP For Claude Marketplace
Luhn CC Validator

Luhn CC Validator MCP Connector for Claude

A+

Stop LLMs from sending fake credit card numbers to payment gateways. Validates the mathematical Luhn check instantly.

1 tools Official Updated Jun 28, 2026 Official Vinkius Partner
More Details Connect to Claude

LLMs cannot perform complex algorithmic validation like the Luhn check. This results in agents trying to process fake or mistyped credit card numbers, burning API limits and triggering anti-fraud systems. This MCP adds pure, zero-latency validation to the edge.

The Superpowers

  • Pre-Flight Validation: Instantly block mathematically invalid credit card numbers before making costly Stripe/Adyen API calls.
  • Brand Detection: Accurately identifies Visa, Mastercard, AMEX, and Discover purely based on mathematical prefixes.
checksum-validationfraud-preventioncredit-card-validationdata-integrityalgorithmic-check

1 tools expose this connector's capabilities to your AI agent.

validate_luhn

Pass the card number string and receive validation status plus card brand detection (Visa, Mastercard, Amex). Validates credit card numbers using the mathematical Luhn algorithm and detects the card brand

See how to talk to your AI agent using Luhn CC Validator.

Run the Luhn algorithm to check if `4242424242424242` is a mathematically valid credit card number.

✅ **Checksum Valid:** Passed Luhn verification. Brand identified as `Visa` based on prefix rules.

A user submitted `378282246310005`. Verify the checksum and detect if it is American Express.

✅ **Validation Status:** Valid. - **Brand:** `American Express` - **Sanitized:** Cleaned spaces and hyphens successfully.

Validate this mistyped card number `5555444433332221` before sending it to the Stripe API.

❌ **Pre-flight Error:** Blocked! The number failed the mathematical Luhn modulo-10 checksum.

No, it purely validates the mathematical checksum of the number. It does not contact any bank.

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