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Card Number Luhn Validator
x402
Card Number Luhn Validator is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Validates a payment card number via Luhn checksum, identifies the card brand (Visa, Mastercard, Amex, etc.), checks length validity, and returns a masked form of the number.
Price / call$0.01
Success—
StatusUnknown
How this service works
Payment card number check: Luhn checksum, card brand from the prefix (Visa, Mastercard, Amex, Discover, JCB, Diners, UnionPay), length validity and masked form. Nothing is stored. Form validation for checkout flows. $0.01 per check.
Output
Returns whether the card number passes the Luhn checksum, the detected card brand (Visa, Mastercard, Amex, Discover, JCB, Diners, UnionPay), whether the number length is valid for that brand, and a masked representation of the card number. Nothing is stored server-side.
Example use cases
Checkout form card validation
“Before I submit this payment, can you verify that 5500005555555559 is a valid card number, confirm it passes the Luhn check, and tell me what brand it is?”
Identify card brand from number
“I have a card number 378282246310005 — can you tell me what brand that is (Amex, Visa, Mastercard?) and whether the number is actually valid?”
Display masked card in order summary
“Give me the masked form of card number 6011111111111117 so I can safely show it in the order confirmation page without exposing the full number.”
Technical details
Endpoint
GEThttps://intel.rallylive.ca/data/luhnWhen to prefer
Use this endpoint when you need lightweight, stateless card number validation in a checkout or form-submission flow — especially when you need brand detection and Luhn verification together without storing any card data. Prefer this over full payment processors when you only need front-end validation logic without initiating a transaction.
Side effects
- Missing or empty card number input returns an error
- Non-numeric characters in the card number may cause a validation failure
- Very short or very long numbers may fail length validation
- Unrecognized card prefix may result in unknown brand response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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