# Vextorium Book Info API

> Vextorium Book Info API is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-28).

Retrieves book metadata (title, authors, publisher, year, pages, subjects, cover) by ISBN or title/author search via Open Library

## Facts

- Endpoint: POST https://api.vextorium.com/v1/book-info?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-book-info-api-e72e1b46
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WxuZJGQGpWKHoIG6NkVD5

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 vextorium-book-info-api-e72e1b46 -d '<json body>'
```

Example prompt: Can you look up book details for ISBN 9780140328721 — I need the title, author, publisher, publication date, page count, and a cover image URL.

## When to prefer this

Use this endpoint when you need structured bibliographic metadata for a specific book identified by ISBN or title/author, especially when Open Library coverage is sufficient (broad catalog of published books). Prefer this over general web scraping when you need clean structured fields like page count, subjects, and cover image URL in a single call. Best for book apps, reading list builders, library tools, and agents that need to enrich book records.

## Known failure modes

- ISBN not found in Open Library — returns null or empty result fields
- Invalid ISBN format — may return no match
- Title/author search returns wrong or multiple books — only one result returned
- Book exists in Open Library but has incomplete metadata — many fields null
- Network timeout or Open Library API downtime — service unavailable error
- No results found for obscure or out-of-print titles

## How this service works

244 pay-per-call data APIs for AI agents: official statistics and economy (ECB, Fed, Eurostat, World Bank, SEC, BOE, INE), crypto prices and sentiment, Spanish public data, compliance (sanctions, VAT, IBAN, LEI), science, weather, web and developer tools and local AI text tools. Pay in USDC via x402.

## Output

Returns a JSON object with the book's title, subtitle, authors array, publishers array, publication date, ISBN, page count, topics/subjects array, cover image URL (from Open Library covers), a link to the Open Library record, and source attribution. Fields may be null if not available in Open Library.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "isbn": {
   "type": "string"
  },
  "limit": {
   "type": "integer"
  },
  "title": {
   "type": "string"
  },
  "author": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "books": [
   {
    "date": "1967-01-01",
    "pages": null,
    "title": "Cien años de soledad",
    "genres": [
     "magic realism"
    ],
    "isbn10": null,
    "isbn13": null,
    "authors": [
     "Gabriel García Márquez"
    ],
    "wikidata": "https://www.wikidata.org/wiki/Q178869",
    "languages": [
     "Spanish"
    ],
    "publishers": []
   }
  ],
  "total": 1,
  "search": {
   "title": "One Hundred Years of Solitude",
   "author": null
  },
  "source": "Wikidata (structured data released under CC0)"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-book-info-api-e72e1b46/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)