# Public Domain Books

Search Project Gutenberg's free books by title, author, topic and language, with download links.

## How to pay

Machine-payable over x402. USDC on: Base (eip155:8453), Solana (solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp), Polygon (eip155:137), Arbitrum One (eip155:42161).
No accounts. No API keys. No signup. The paying wallet is the account.

## Machine-readable

- OpenAPI: https://public-domain-books.x402tookit.com/openapi.json
- x402 manifest: https://public-domain-books.x402tookit.com/.well-known/x402
- Catalog (free): https://public-domain-books.x402tookit.com/catalog
- Health (free): https://public-domain-books.x402tookit.com/health
- Uptime (free): https://public-domain-books.x402tookit.com/uptime

## Endpoints (7)

### GET /author-books — $0.02
Free Project Gutenberg books by an author name, most downloaded first, with birth and death years.
Params: author: string, limit?: integer
Example: https://public-domain-books.x402tookit.com/author-books?author=jane+austen&limit=8

### GET /book-by-id — $0.02
One Project Gutenberg book by its ebook number: authors, subjects, languages, copyright flag and download links.
Params: id: integer
Example: https://public-domain-books.x402tookit.com/book-by-id?id=1342

### GET /book-search — $0.02
Search free Project Gutenberg books by title or author words, optionally in one language, with download links.
Params: query: string, language?: string, limit?: integer
Example: https://public-domain-books.x402tookit.com/book-search?query=pride+prejudice&limit=5

### GET /era-books — $0.02
Free Project Gutenberg books by authors alive in a year range, such as 1800 to 1850, most downloaded first.
Params: fromYear: integer, toYear: integer, language?: string, limit?: integer
Example: https://public-domain-books.x402tookit.com/era-books?fromYear=1800&toYear=1850&language=en&limit=8

### GET /gutenberg-links — $0.02
Standard Project Gutenberg page, text, EPUB, Kindle, HTML and cover URLs for an ebook number, built without a lookup.
Params: id: integer
Example: https://public-domain-books.x402tookit.com/gutenberg-links?id=1342

### GET /popular-books — $0.02
The most downloaded free Project Gutenberg books right now, overall or in one language, with links.
Params: language?: string, limit?: integer
Example: https://public-domain-books.x402tookit.com/popular-books?language=en&limit=10

### GET /topic-books — $0.02
Free Project Gutenberg books on a subject or bookshelf such as cooking or astronomy, most downloaded first.
Params: topic: string, language?: string, limit?: integer
Example: https://public-domain-books.x402tookit.com/topic-books?topic=cooking&language=en&limit=6

## Terms

Catalogue data comes from Project Gutenberg through the Gutendex index. A book listed as not copyrighted is public domain in the United States only; other countries differ. Automatically generated summaries can be wrong. Check Project Gutenberg's own terms before reusing text commercially.