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Luhn Checksum Validator
x402
Luhn Checksum Validator is a paid API for AI agents from x402.agentindex.world, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-20).
Validates whether a numeric string passes the Luhn (mod 10) checksum algorithm used by most payment card numbers.
Price / call$0.002
Success—
StatusUnknown
How this service works
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Output
A pass/fail result indicating whether the provided numeric string satisfies the Luhn (mod 10) checksum condition, confirming the number is structurally consistent with a real payment card number.
Example use cases
Pre-payment card number check
“Before I charge this customer, can you verify that the card number 4111 1111 1111 1111 passes the Luhn checksum so I know it's at least structurally valid?”
Validate user-entered card at checkout
“A user just typed in card number 1234-5678-9012-3456 on our checkout form — can you run it through the Luhn algorithm and tell me if it's valid?”
Fraud screening for batch of card numbers
“I have a suspicious card number 4916338506082832 that someone submitted — can you do a Luhn check on it to see if it even has a valid checksum?”
Technical details
Endpoint
GEThttps://x402.agentindex.world/validate/luhn?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, lightweight structural check on a payment card number before attempting a real transaction. It is ideal for pre-validation in checkout flows, fraud detection pipelines, or any scenario where you want to filter out obviously invalid card numbers without running a full authorization. It does not verify the card exists or has funds — it only checks the checksum.
Side effects
- Non-numeric characters other than spaces or hyphens cause a validation error
- Number too short or a single digit fails the pattern constraint
- Empty string or missing number parameter returns an error
- Numbers with letters or special symbols are rejected by the input schema
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"valid": true
}
}Tags
x402
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