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UPC-A Luhn Check
x402
UPC-A Luhn Check is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.009/call, status unknown (last checked 2026-10-11).
Validates whether a 12-digit UPC-A barcode passes the Luhn (check digit) algorithm
Price / call$0.009
Success—
StatusUnknown
How this service works
Call when an agent needs whether a 12-digit UPC-A passes Luhn. Send JSON {"value":"123"}. Exact $0.009 USDC on Base. Try unpaid POST /v1/sandbox/check-upc-a first.
Output
A pass/fail boolean or equivalent indicating whether the provided 12-digit UPC-A string has a valid Luhn check digit, confirming or rejecting the barcode's structural integrity.
Example use cases
Validate scanned product barcode
“I just scanned a barcode that reads 036000291452 — can you tell me if that's a valid UPC-A number before I add it to my product catalog?”
Catch typos in entered UPC codes
“A user manually typed in 012345678901 as a UPC-A code — can you verify if the check digit is correct so we don't store a bad barcode?”
Bulk inventory data quality check
“We received a product feed with UPC-A code 085392132225 — can you validate that barcode passes the Luhn algorithm before we import it into our system?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-upc-a?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, deterministic, server-side Luhn validation of a 12-digit UPC-A barcode — particularly in agentic pipelines where you want an external authoritative check rather than local computation. Prefer the free sandbox endpoint POST /v1/sandbox/check-upc-a for testing or non-production use to avoid the $0.009 USDC charge.
Side effects
- Input is not exactly 12 digits — returns invalid or error
- Non-numeric characters in the input cause a validation error
- Empty or missing value field returns a bad request error
- String exceeds maxLength of 20000 (unlikely for UPC-A but schema-enforced)
- Payment failure (insufficient USDC) blocks the request with a 402 response
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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