# Project Gutenberg Books by Language

> Project Gutenberg Books by Language is a paid API for AI agents from clonecho.builda.company, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Returns a list of public-domain books from Project Gutenberg filtered by a given language code.

## Facts

- Endpoint: POST https://clonecho.builda.company/x402/s/gutenberg-books-by-language
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/project-gutenberg-books-by-language-335ddbfc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KPd8KEYBVkkrC62kwjhfo

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-by-language-335ddbfc -d '<json body>'
```

Example prompt: Can you pull up a list of public-domain books available in French from Project Gutenberg? Use language code 'fr'.

## When to prefer this

Use this endpoint when you need to browse or list public-domain books from Project Gutenberg filtered specifically by language code, rather than by title or author keyword search. Prefer this over the title/author search sibling endpoint when the user wants to discover books in a particular language without a specific title in mind.

## Known failure modes

- Invalid or unsupported language code returns empty results or an error
- Missing 'q' parameter may return an error or all books
- Language code typo returns no results
- Endpoint returns 402 if payment is not provided

## How this service works

Public-domain books from Project Gutenberg in a given language code q. Query: ?q= Returns JSON.

## Output

A JSON array of public-domain books from Project Gutenberg matching the given language code, likely including book titles, authors, download counts, and book identifiers.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/project-gutenberg-books-by-language-335ddbfc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from clonecho.builda.company](https://www.zero.xyz/host/clonecho.builda.company/llms.txt)