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ISBN Check Digit Validator & Converter
x402
ISBN Check Digit Validator & Converter is a paid API for AI agents from id-validators.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).
Validates the check digit of an ISBN-10 or ISBN-13 and converts between the two forms.
Price / call$0.02
Success—
StatusUnknown
How this service works
Validate an ISBN-10 or ISBN-13 check digit and convert between the two forms.
Output
Returns a verdict (valid/invalid), the normalized ISBN, the detected form (ISBN-10 or ISBN-13), the ISBN-10 equivalent if applicable, the publisher prefix, a human-readable summary, and an array of reasons explaining any validation failures. May also include source, asOf timestamp, degraded flag, disclaimer, and a list of checks not performed.
Example use cases
Validate ISBN before book listing
“Before I add this book to our catalog, can you verify that the ISBN 0-306-40615-2 has a valid check digit and tell me what its ISBN-13 form would be?”
Catch bad ISBNs in data import
“I'm importing a spreadsheet of books and one entry has ISBN 9780140449136 — can you confirm it's a valid ISBN-13 and give me the normalized form?”
Identify ISBN format in user submission
“A user submitted the identifier 0451526538 for a book — can you tell me if it's a valid ISBN, which form it is (10 or 13), and what the canonical version looks like?”
Technical details
Endpoint
GEThttps://id-validators.x402tookit.com/isbn-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you specifically need to validate the check digit of an ISBN-10 or ISBN-13 and/or convert between the two forms. It is purpose-built for book identifiers and returns detailed per-field breakdown including prefix, form, and normalized representation — more specific than a general barcode validator. Use sibling endpoints for other identifier types (ISSN, EAN, CUSIP, etc.).
Side effects
- Missing or empty 'id' query parameter returns an error
- Malformed input (e.g. non-numeric characters in wrong positions) results in an invalid verdict with reasons
- ISBN of wrong length (not 10 or 13 digits) returns an invalid verdict
- Network or service unavailability returns a non-200 response
- Payment failure (x402) prevents the request from completing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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