# book-record

> 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)

## Facts

- Endpoint: POST https://market.561.group/v1/book-record?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/book-record-9961b750
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Z-lnd7doKHWmIo5AdLw2d

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability book-record-9961b750 -d '<json body>'
```

Example prompt: Can you look up the book with ISBN 978-0-7432-7356-5 and give me the full bibliographic record — author, edition, and work details — formatted as CSL-JSON?

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "isbn": {
   "type": "string",
   "description": "An ISBN-10 or ISBN-13, with or without hyphens."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/book-record-9961b750/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market.561.group](https://www.zero.xyz/host/market.561.group/llms.txt)