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book-record
x402
book-record is a paid API for AI agents from market.561.group, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-12).
Validates an ISBN-10 or ISBN-13 checksum and returns a unified CSL-JSON book record sourced from Open Library (edition, work, and author data)
Price / call$0.002
Success—
StatusUnknown
How this service works
Validate one ISBN checksum and return its Open Library edition, work and author records projected into one sourced CSL-JSON book item; invalid or absent ISBNs return an explicit refusal. The FOUR truth reading is true when found and neither on refusal.
Output
A single CSL-JSON book item merging Open Library edition, work, and author records, including fields such as title, author name(s), publisher, publication date, and identifiers. If the ISBN fails checksum validation or is absent from Open Library, the endpoint returns an explicit structured refusal rather than partial data.
Example use cases
Citation generation for academic paper
“I need a properly formatted bibliographic entry for the book with ISBN 0-7432-7356-7 — can you fetch the author, title, and edition info and give it back as CSL-JSON so I can paste it into my reference manager?”
Bookstore inventory enrichment
“We just scanned a pile of used books and got a list of ISBNs. Start with ISBN 978-0-14-028329-7 — validate it and pull the full Open Library record so we can display the author and edition on our listing page.”
ISBN validity check before purchase
“Before I submit this order, can you verify that ISBN 0-316-76948-7 is a valid checksum and tell me what book it actually corresponds to?”
Technical details
Endpoint
POSThttps://market.561.group/v1/book-record?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a single validated, authoritative bibliographic record for one book identified by ISBN-10 or ISBN-13, projected into CSL-JSON format ready for citation managers or academic workflows. Prefer it over raw Open Library API calls because it handles checksum validation, record merging across edition/work/author layers, and explicit refusal on bad input — all in one call. Best suited for per-book lookups rather than bulk catalog ingestion.
Side effects
- Invalid ISBN checksum — endpoint returns explicit refusal with reason rather than partial data
- ISBN not found in Open Library — returns structured absence/refusal response
- Malformed ISBN string (wrong length, non-numeric characters) — validation rejection
- Open Library API unavailability — upstream lookup fails
- ISBN-10 to ISBN-13 conversion edge cases may cause unexpected misses
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| isbn | string | An ISBN-10 or ISBN-13, with or without hyphens. |
Tags
x402
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