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Amex Card Number Validator (Luhn + Network Check)
x402
Amex Card Number Validator (Luhn + Network Check) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.009/call, status unknown (last checked 2026-09-29).
Validates that a card number passes the Luhn algorithm and matches American Express card format, without storing any data.
Price / call$0.009
Success—
StatusUnknown
How this service works
Call when an agent needs whether a number passes Luhn and matches amex. Nothing is stored. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/check-card-amex first.
Output
Returns whether the submitted card number passes the Luhn checksum algorithm and whether it matches American Express card number patterns (starting digits and length). No data is persisted after the check.
Example use cases
Checkout form card network detection
“Before we process the payment, verify that the card number 371449635398431 passes Luhn validation and is actually an American Express card, not Visa or Mastercard.”
Fraud screening pre-check
“I have a card number from a suspicious order — can you run a Luhn check on 378734493671000 and tell me if it's a structurally valid Amex card?”
Card input validation in onboarding
“The user typed in 370000000000002 as their card number during sign-up — can you confirm it's a valid Amex number before we save it?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-card-amex?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need to validate that a card number is both mathematically valid (Luhn) and belongs to the American Express network. Prefer the free sandbox POST /v1/sandbox/check-card-amex first for testing. Choose this over generic Luhn-only checkers when network identification (Amex specifically) is required alongside checksum validation.
Side effects
- Missing or empty card number value returns validation error
- Non-numeric or malformed input may return format error
- Card number too long or too short may fail schema validation (maxLength 20000 chars)
- Network timeout or HTTP 402 if payment not handled correctly
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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