# Project Gutenberg Books Lookup

> Project Gutenberg Books Lookup is a paid API for AI agents from x402-toolbox.shablony-pro.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).

Retrieves book listings and metadata from Project Gutenberg's public domain library catalog via a pay-per-call API over the x402 protocol.

## Facts

- Endpoint: GET https://x402-toolbox.shablony-pro.workers.dev/books/gutenberg-books?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/project-gutenberg-books-lookup-4b2f187a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gVb3GeDE3odYgdwioIeiT

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 project-gutenberg-books-lookup-4b2f187a
```

Example prompt: Can you look up what books are available on Project Gutenberg for me? I'm looking for classic public domain novels I can read for free.

## When to prefer this

Choose this endpoint when you need quick, no-signup access to Project Gutenberg's public domain book catalog and are already operating within the x402 micropayment ecosystem using USDC on Base. It is ideal for AI agents that need to programmatically discover classic literature without managing API keys or accounts.

## Known failure modes

- Payment not included or rejected — returns HTTP 402 requiring x402 USDC payment on Base
- Invalid schema parameter — may return empty or malformed results
- Upstream Gutenberg data unavailable — endpoint may return an error or empty catalog
- Network timeout on the Cloudflare Workers edge — transient 5xx error

## How this service works

309 deterministic pay-per-call tools for AI agents over x402 (USDC, Base). No signup, no API key: the payment is the identity.

## Output

Returns a JSON response with a list of books available on Project Gutenberg, including metadata such as titles, authors, and availability details, along with a confirmation that the payment was accepted (ok: true, paid: true).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "schema": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/project-gutenberg-books-lookup-4b2f187a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-toolbox.shablony-pro.workers.dev](https://www.zero.xyz/host/x402-toolbox.shablony-pro.workers.dev/llms.txt)