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Luhn Algorithm String Validator
x402
Luhn Algorithm String Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).
Validates whether the digits in a given string pass the Luhn checksum algorithm
Price / call$0.002
Success—
StatusUnknown
How this service works
Call when an agent needs whether the digits in a string pass Luhn. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/check-luhn first.
Output
A boolean or pass/fail result indicating whether the digits in the provided string satisfy the Luhn algorithm checksum. The response confirms if the number is structurally valid per the Luhn mod-10 computation.
Example use cases
Credit card number validation
“Before I submit this payment form, can you verify that the card number 4111111111111111 passes the Luhn checksum?”
IMEI number integrity check
“I have an IMEI number 490154203237518 — does it pass the Luhn check to confirm it's a valid format?”
Generated card number QA
“I just generated a test card number 5500005555555559 for our sandbox — can you confirm it passes Luhn validation before we use it in testing?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-luhn?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, paid, reliable Luhn checksum validation for any digit string — especially in production workflows where you need confidence in the result. The description recommends trying an unpaid POST /v1/sandbox/check-luhn first for testing. Prefer this over manual computation when you want a hosted, API-driven validation step in an automated pipeline.
Side effects
- Empty string input returns an error (minLength:1 enforced)
- String exceeding 20000 characters rejected (maxLength enforced)
- Non-numeric or malformed strings may return invalid/false rather than an error
- Payment failure (402) if USDC funds are insufficient
- Network timeout or service unavailability returns 5xx error
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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