# Supreme Audiobooks

> A catalogue of 3,024 public-domain audiobooks by 1,822 authors, published as video with synchronised illustration and subtitles. The recordings are LibriVox volunteer readings of out-of-copyright books. Everything a person or a search engine can reach is free; only bulk machine access to the catalogue is metered.

Things worth knowing before you use this content:

- **The audio is public domain and is not ours.** Every recording comes from LibriVox, where volunteers read out-of-copyright books and place the results in the public domain. You need no permission and no payment from us to use any of it. Better originals are at librivox.org and archive.org. Do not credit us as the source of a recording.
- **The descriptions are machine-written.** Every book's summary and commentary was generated by a language model from the book's metadata, then published without a human reading it against the book. 3,022 of 3,024 books carry one. They are a reasonable guide to what a book is about and a poor source for any specific claim about its plot, characters or publication.
- **The translations are machine translation.** Titles and descriptions are translated into 11 languages (ar, bg, de, es, fr, hi, ja, ko, pt, ru, zh) by a neural MT model, covering 2,884 books and 31,521 records. No human reviews them. Where a translated title disagrees with the English one, the English one is the original.
- **Transcripts exist for 137 books, not for all of them.** Those 137 each have 12 language versions (1,644 records). They are speech recognition output of a volunteer reading, so they carry both the reader's departures from the text and the recogniser's errors. They are not the book's text — for that, use Project Gutenberg.
- **Two catalogue fields are mostly empty and one is not a number.** `words` is populated for 4 of 3,024 books; the zero elsewhere means "never computed", not "no words". `year` is present for 134 of 3,024. `duration` is a display string like "20h 27m", not ISO 8601, and it describes our published video rather than any edition of the book.
- **`genre` is assigned by machine and the vocabulary is not closed.** 32 distinct values are in use across the catalogue, but only 32 of them are curated categories with a page of their own; the remainder are one-offs the classifier produced and nobody has folded back in (currently ). Every book carries exactly one genre, so a short-story collection or a mixed-subject volume gets an arbitrary winner. Treat it as a browsing aid, not a bibliographic classification.
- **40 long books are split across several published parts**, each with its own slug and its own video. Treat the parts as one work when counting titles, and expect the runtime of a single part to be a fraction of the book.
- **726 of 3,024 books are in the sitemaps.** The rest have pages and are reachable, but were not submitted for indexing. A sitemap crawl is therefore a subset of the catalogue, not the catalogue.
- **Nothing here is a paywall for people.** There is no account, no subscription and no metering on any page a browser can open. The priced endpoints below exist for clients that want the whole catalogue in one request instead of crawling it.

## Start here

- [Browse the library](https://supremeaudiobooks.com/library): every book, searchable and filterable by genre and length.
- [Authors](https://supremeaudiobooks.com/authors): 1,822 authors with their catalogued works.
- [Genres](https://supremeaudiobooks.com/genres): the 32 browsing categories.
- [Collections](https://supremeaudiobooks.com/collections): curated groupings across authors and periods.
- [Quotes](https://supremeaudiobooks.com/quote): 1,699 selected passages from 175 books, with context.
- [About](https://supremeaudiobooks.com/about): what this project is and who runs it.

## Browsing by genre

The largest categories, with how many books are in each:

- [Literary Fiction](https://supremeaudiobooks.com/genre/Literary%20Fiction): 414 books.
- [Biography & Memoir](https://supremeaudiobooks.com/genre/Biography%20%26%20Memoir): 226 books.
- [Children's Literature](https://supremeaudiobooks.com/genre/Children's%20Literature): 195 books.
- [Non-Fiction](https://supremeaudiobooks.com/genre/Non-Fiction): 178 books.
- [Short Stories](https://supremeaudiobooks.com/genre/Short%20Stories): 153 books.
- [Poetry](https://supremeaudiobooks.com/genre/Poetry): 152 books.
- [History](https://supremeaudiobooks.com/genre/History): 150 books.
- [Historical Fiction](https://supremeaudiobooks.com/genre/Historical%20Fiction): 147 books.
- [Essays](https://supremeaudiobooks.com/genre/Essays): 126 books.
- [Religion & Spirituality](https://supremeaudiobooks.com/genre/Religion%20%26%20Spirituality): 123 books.
- [Adventure](https://supremeaudiobooks.com/genre/Adventure): 118 books.
- [Classic Literature](https://supremeaudiobooks.com/genre/Classic%20Literature): 115 books.
- [Humor & Satire](https://supremeaudiobooks.com/genre/Humor%20%26%20Satire): 115 books.
- [Mystery & Detective](https://supremeaudiobooks.com/genre/Mystery%20%26%20Detective): 87 books.

## Terms and machine-readable metadata

- [Licensing](https://supremeaudiobooks.com/licensing): what is ours to license and what is not, in full.
- [API for agents](https://supremeaudiobooks.com/api): prices, the payment flow and what each endpoint returns.
- [Agent manifest](https://supremeaudiobooks.com/api/agent/manifest): the same, as JSON, free.
- [x402 discovery](https://supremeaudiobooks.com/.well-known/x402): payment terms, free.
- [Terms](https://supremeaudiobooks.com/terms) and [DMCA](https://supremeaudiobooks.com/dmca): the formal versions.

## Priced endpoints

Payment is x402 over HTTP: request, get a 402 with an accepts block, retry with a signed X-PAYMENT header. No account and no key. Everything else on this site is free.

- `GET /api/v1/catalog` — every book in one response. $0.05
- `GET /api/v1/books/{slug}` — one book, with its description. $0.001
- `GET /api/v1/search?q=` — title and author search, 200 results max. $0.002
- `GET /api/v1/transcripts/{slug}?lang=en` — one transcript, one language. $0.01

Free and never metered: `/api/v1`, `/api/v1/status`, `/.well-known/x402`, `/api/agent/manifest`, `/llms.txt`, `/robots.txt`, every sitemap, `/feed` and `/podcast/feed.xml`. Search-engine crawlers are exempt from metering everywhere on the site.

## Contact

contact@supremeaudiobooks.com. If a description says something untrue about a book or an author, or a recording should not be public domain, say which slug and it gets fixed or removed.

Catalogue last changed: 2026-08-23T23:59:11.693Z.