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ISBN-13 Checksum Validator
x402
ISBN-13 Checksum Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).
Validates whether a given ISBN-13 string passes its checksum (mod-10 algorithm), returning true or false.
Price / call$0.005
Success—
StatusUnknown
How this service works
Call when an agent needs whether an ISBN-13 checksum is valid. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/check-isbn-13 first.
Output
Returns a boolean or structured response indicating whether the provided ISBN-13 string's checksum digit is mathematically valid according to the ISBN-13 mod-10 (Luhn-style) algorithm. No external network calls or LLM inference are involved — it is a pure deterministic computation.
Example use cases
Bookstore inventory data cleanup
“I'm importing a spreadsheet of book ISBNs into our inventory system — can you check whether 9780525559474 is a valid ISBN-13 before I add it?”
User-submitted book lookup validation
“A user just entered 9781234567897 as their book's ISBN — is that a legitimate ISBN-13 or did they mistype it?”
Publisher catalog QA pipeline
“We're auditing our catalog and need to know if 9783161484100 has a correct check digit — can you verify the ISBN-13 checksum?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-isbn-13?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a deterministic, authoritative checksum check for an ISBN-13 and want to avoid implementing the mod-10 algorithm yourself. Prefer the free sandbox endpoint (POST /v1/sandbox/check-isbn-13) for testing or high-volume batch validation before falling back to this paid endpoint. Choose this over an LLM guess when correctness is required.
Side effects
- Input string shorter or longer than 13 digits — may return invalid or error
- Non-numeric characters in the ISBN string cause a parse error
- Empty or missing value field returns a validation error
- Malformed JSON request body returns HTTP 400
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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