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Agent402 UK Luhn Checksum Validator
x402
Agent402 UK Luhn Checksum Validator is a paid API for AI agents from agent402.co.uk, paid per call via x402, $0.001/call, status down (last checked 2026-09-15).
Validates a digit string using the Luhn algorithm and returns a masked version of the number in the response.
Price / call$0.001
Success—
StatusDown
How this service works
Don't burn tokens on deterministic work. Go/no-go jobs first: payout preflight, text firewall (PII/secrets), budget check — then rails, calendars, finmath. x402 USDC on Base. UK + global. agent402.co.uk — not agent402.tools. $0.001–$0.002 USDC on Base. No API keys.
Output
Returns a boolean indicating whether the input digit string passes the Luhn checksum, along with a masked version of the number (e.g., with middle digits obscured) to avoid exposing sensitive data in logs or responses.
Example use cases
Pre-payment card number check
“Before I submit this order, can you verify that the card number 4111111111111111 passes the Luhn check? I want to catch any typos before the payment goes through.”
IMEI number validation
“I need to verify that this IMEI number 490154203237518 is valid — can you run it through the Luhn algorithm and tell me if it checks out?”
Card data quality gate in a pipeline
“We're processing a batch of user-submitted card numbers and I want to pre-screen one: does 5500005555555559 pass Luhn validation? Return the masked version too.”
Technical details
Endpoint
POSThttps://agent402.co.uk/v1/validate/luhnWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call Luhn checksum validation with built-in number masking — especially useful in agent pipelines where you want to avoid logging raw card or sensitive digit strings. Prefer it over rolling your own Luhn logic when you need a reliable hosted validator with a simple POST interface and no API key setup.
Side effects
- Non-digit characters in the input may cause a validation error or unexpected result
- Empty string input may return an error or false validity
- Extremely long digit strings may be rejected
- Network or payment processing errors may return a non-200 status
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| number | string | Digits to check |
Output
Schema · Response
{
"type": "json",
"example": {
"valid": true,
"digits": 16,
"masked": "4111********1111"
}
}Tags
x402
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