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AgentShelf ISBN Validator
x402
AgentShelf ISBN Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-02).
Validates whether a given string is a correctly formatted ISBN-10 or ISBN-13 identifier
Price / call$0.006
Success—
StatusUnknown
How this service works
Call when an agent needs whether a string is a valid ISBN-10 or ISBN-13. Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/check-isbn first.
Output
A boolean or structured response indicating whether the submitted string is a valid ISBN-10 or ISBN-13, along with which format matched (if valid)
Example use cases
Book catalog data quality check
“I'm about to add this book to our catalog — can you verify that '0-306-40615-2' is a valid ISBN before I save it?”
User-submitted ISBN validation
“A customer entered '9780141036144' as their book's ISBN on our platform — is that a real valid ISBN-13?”
Automated inventory import validation
“Before I import this batch entry, check whether '0195153448' passes ISBN-10 validation so I can flag it if it's wrong.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-isbn?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, cheap, authoritative check on whether a string conforms to ISBN-10 or ISBN-13 checksum rules — especially useful in book catalog ingestion pipelines, user input validation, or e-commerce workflows. Prefer the free sandbox endpoint (/v1/sandbox/check-isbn) for testing; use this paid endpoint in production when reliability and uptime matter.
Side effects
- Empty or missing 'value' field returns an error
- String longer than 20,000 characters rejected
- Malformed request body returns 400
- Network timeout or service unavailability returns 5xx
- Non-ISBN strings (e.g. random numbers) return invalid result without 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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