# eu-verify ISBN Lookup

> eu-verify ISBN Lookup is a paid API for AI agents from data.greeneris.io, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Looks up book metadata by ISBN (ISBN-10 or ISBN-13) including title, authors, cover, publishers, and subjects via Open Library

## Facts

- Endpoint: GET https://data.greeneris.io/v1/books/isbn
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/eu-verify-isbn-lookup-530c91ea
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AozeT5zayAHsdCnvTpafJ

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 eu-verify-isbn-lookup-530c91ea
```

Example prompt: Can you look up the book details for ISBN 9780140328721 — I want the title, authors, publisher, and cover image?

## When to prefer this

Use this endpoint when you need to resolve bibliographic metadata for a known ISBN number and want structured data including cover art, authors, subjects, and publisher. Prefer it over general web search when you need machine-readable book data. Note: this is hosted on an EU business verification platform as a supplemental data endpoint, so it is available pay-per-call with no account needed.

## Known failure modes

- ISBN not found in Open Library — empty or 404 response
- Malformed ISBN input (non-numeric, wrong length) — validation error
- Payment not completed via x402 — HTTP 402 with machine-readable price quote
- Network timeout or Open Library upstream unavailability

## How this service works

Resolves an ISBN-10 or ISBN-13 to a normalized bibliographic record from Open Library (Internet Archive): title, authors, publishers, publish date, page count, ISBN identifiers, subjects and cover image URL. Query: ?isbn=9780140328721 (hyphens/spaces tolerated). Unknown ISBNs return 400 (not charged). 7-day cache. Built for catalog management, e-commerce listings and used-book pricing agents.

## Output

Returns a JSON object with the book's title, authors list, subtitle, ISBN-10, ISBN-13, subjects, cover image URL, publisher(s), publish date, number of pages, Open Library ID, and a direct link to the Open Library record.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "isbn"
     ],
     "properties": {
      "isbn": {
       "type": "string",
       "description": "ISBN-10 or ISBN-13 (hyphens/spaces allowed)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "isbn": "9780140328721",
  "title": "Fantastic Mr. Fox",
  "source": "Open Library (openlibrary.org, Internet Archive)",
  "authors": [
   "Roald Dahl"
  ],
  "isbn_10": "0140328726",
  "isbn_13": "9780140328721",
  "subjects": [
   "Animals",
   "Hunger",
   "Juvenile fiction",
   "Foxes",
   "Fiction"
  ],
  "subtitle": null,
  "cover_url": "https://covers.openlibrary.org/b/id/15152634-L.jpg",
  "publishers": [
   "Puffin"
  ],
  "publish_date": "October 1, 1988",
  "openlibrary_id": "OL7353617M",
  "number_of_pages": 96,
  "openlibrary_url": "http://openlibrary.org/books/OL7353617M/Fantastic_Mr._Fox"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/eu-verify-isbn-lookup-530c91ea/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from data.greeneris.io](https://www.zero.xyz/host/data.greeneris.io/llms.txt)