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Delx Luhn Valid
x402
Delx Luhn Valid is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates a digit string (e.g. a credit card number) using the Luhn checksum algorithm, returning whether it passes and its digit count.
Price / call$0.001
Success—
StatusUnknown
How this service works
Luhn check for digit strings (cards/IDs). Call when you reject obviously invalid card-shaped numbers before payment UI. Returns valid boolean and digit count for $0.001 USDC via x402 on Base. Checksum only—not issuer, funds, or PAN storage. No network, no keys, no retention. Results are advisory; the caller owns budgets, auth, and production controls.
Output
Returns a JSON object with a boolean indicating whether the digit string passes the Luhn checksum, and an integer representing the number of digits in the input string. No issuer lookup, no network verification, no PAN storage — purely an algorithmic checksum result.
Example use cases
Pre-payment card number screening
“I want to validate the card number 4111111111111111 with a Luhn check before we show the payment confirmation screen — is it valid?”
Filter bad card entries in a form
“The user just typed '1234567890123456' as their card number — run a Luhn checksum on it so we can reject it client-side before even attempting to charge them.”
Verify loyalty card or ID number
“Can you do a Luhn validity check on this loyalty card ID '79927398713' and tell me if it passes the checksum and how many digits it has?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/luhn-validWhen to prefer
Use this endpoint when you need a fast, cheap, stateless pre-flight check to reject obviously invalid card-shaped digit strings before submitting them to a payment processor or identity system. It is not a substitute for real card authorization or issuer validation — it only confirms the Luhn checksum. Ideal for agents that want to avoid wasting expensive payment API calls on malformed card numbers.
Side effects
- Non-digit characters in input may cause validation failure or error response
- Empty string input may return invalid or error
- Input with spaces or dashes (unstripped) may fail — caller should normalize first
- Network or payment authorization failure for the $0.001 USDC x402 fee could block the call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| number | string | Input field: number. |
Output
Schema · Response
{
"type": "json",
"example": {
"valid": true,
"digits": 16,
"schema": "delx/util-luhn-valid/v1"
}
}Tags
x402
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