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Luhn Credit Card Number Validator
x402
Luhn Credit Card Number Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-02).
Validates whether a card-shaped number string passes the Luhn (mod-10) checksum algorithm
Price / call$0.006
Success—
StatusUnknown
How this service works
Call when an agent needs whether a card-shaped number passes Luhn. Nothing is stored. Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/check-card-any first.
Output
A boolean or pass/fail indicator showing whether the submitted card number string satisfies the Luhn (mod-10) algorithm. No card data is stored. The result reflects only structural checksum validity, not whether the card is active or real.
Example use cases
Pre-payment card format check
“Before submitting to the payment gateway, can you verify that card number 5500005555555559 passes the Luhn check so we know it's at least structurally valid?”
E-commerce checkout form validation
“A user entered 4000056655665556 on our checkout form — can you run a Luhn validation on it to see if it could be a real card number?”
Test card number verification
“I'm writing integration tests and want to confirm that 378282246310005 is a Luhn-valid card number — can you validate it for me?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-card-any?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a stateless, fast Luhn checksum check on a card-shaped number string without storing any data. Use the free sandbox endpoint POST /v1/sandbox/check-card-any first if available. Prefer this paid endpoint when the sandbox is unavailable or when operating in production. It does not validate that the card is active, issued, or belongs to a real account — only that the digits satisfy the mod-10 algorithm.
Side effects
- Empty or missing value field returns an error
- Value exceeds 20000 character maxLength
- Non-numeric characters may cause unexpected results
- Payment failure if USDC balance is insufficient for the $0.006 charge
- Network timeout if the endpoint is temporarily unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| data | — | JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN. |
| value | string | Value to check. The route description names the format: email, phone, IBAN, postal code, VAT, national id, or similar. |
| schema | — | JSON Schema document for schema-check SKUs. Omit it on string checks. |
Tags
x402
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