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Luhn Check & Card Brand Detector
x402
Luhn Check & Card Brand Detector is a paid API for AI agents from api.24klabs.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Validates a number against the Luhn checksum algorithm and identifies the payment card brand (Visa, Mastercard, Amex, etc.).
Price / call$0.001
Success—
StatusUnknown
How this service works
Validate a number by the Luhn checksum and detect the card brand.
Output
Returns whether the card number passes the Luhn checksum (true/false) and the detected card brand (e.g. Visa, Mastercard, American Express, Discover, etc.).
Example use cases
Pre-charge card number validation
“Before I try to charge this customer, can you verify that the card number 5425233430109903 passes the Luhn check and tell me what brand it is?”
Form input validation for checkout
“A user just typed 378282246310005 into our checkout form — is it a valid card number and what type of card is it?”
Detect card brand for routing
“I have the card number 6011111111111117 and need to know if it's valid and what network it belongs to so I can route it to the right processor.”
Technical details
Endpoint
POSThttps://api.24klabs.ai/api/v1/luhn-checkWhen to prefer
Use this endpoint when you need a fast, lightweight structural validation of a payment card number — confirming it's not a random or mistyped string via Luhn checksum — and simultaneously want to identify the card brand without calling a full payment processor. Ideal for form validation, fraud screening, or routing logic before any actual payment transaction.
Side effects
- Invalid or missing card number in request body returns an error
- Non-numeric characters in the card number may cause a parse error
- Very short or empty strings may fail validation with an error response
- Unknown card prefixes may return null or unknown for brand even if Luhn passes
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| number | string |
Output
Schema · Response
{
"type": "json",
"example": {
"brand": "Visa",
"valid": true
}
}Tags
x402
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