# Vextorium Book Info (ISBN & Title Search)

> Vextorium Book Info (ISBN & Title Search) is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-29).

Looks up book metadata by ISBN-10/13 or title+author search via Open Library, returning title, authors, publisher, year, pages, languages, subjects, cover image, and links.

## Facts

- Endpoint: POST https://api.vextorium.com/libro-info-pago?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-book-info-isbn-title-search-2091540e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PpMcOSUJ-8nEx63dpa3wg

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-isbn-title-search-2091540e -d '<json body>'
```

Example prompt: Can you look up the book details for ISBN 9780743273565 — I need the title, authors, publisher, publication year, and page count.

## When to prefer this

Use this endpoint when you need structured bibliographic metadata (authors, publisher, year, pages, subjects, cover) for a specific book identified by ISBN or a title/author query, and you want results sourced from Open Library. Prefer this over generic web search when you need clean, structured data fields rather than unstructured text, and when the $0.002 per-call cost is acceptable for reliable bibliographic lookups.

## Known failure modes

- ISBN not found in Open Library — returns null fields or empty result
- Title/author search yields no matches — returns null or empty
- Ambiguous title search returns unintended book — limit parameter helps narrow results
- Malformed or invalid ISBN format — may return no result
- Open Library upstream unavailable — request times out or returns error

## How this service works

Book data by ISBN (10 or 13) or search by title and author on Open Library: title, authors, publisher, year, pages, languages, subjects, cover and links.

## Output

Returns a JSON object with the book's ISBN, title, subtitle, list of authors, list of publishers, publication date, page count, subjects/topics, cover image URL, a link to the Open Library record, and the data source label. Fields may be null if not available.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "isbn": {
   "type": "string"
  },
  "autor": {
   "type": "string"
  },
  "limite": {
   "type": "integer"
  },
  "titulo": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-book-info-isbn-title-search-2091540e/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)