Book-to-audiobook API

Plans and prices

Every plan, in full

On the record

API job handling

Audiobook jobs run asynchronously and can be checked through a status URL or an optional callback webhook.sats4ai.com · read 7 Oct 2026

Book conversion

The service turns EPUB, PDF, or TXT files into chaptered M4B audiobooks.sats4ai.com · read 7 Oct 2026

Chapter markers

Completed audiobooks are downloadable as M4B files with chapter markers.sats4ai.com · read 7 Oct 2026

Developer integrations

Sats4AI documents L402 over HTTP, MCP, and WebLN as integration options for its services.sats4ai.com · read 7 Oct 2026

File handling

Uploaded files are kept for 72 hours to address conversion faults, then deleted.sats4ai.com · read 7 Oct 2026

Input limits

The upload form accepts EPUB, PDF, or TXT files up to 50 MB and recommends EPUB because PDF and TXT results vary.sats4ai.com · read 7 Oct 2026

Language coverage

The product page says audiobooks can be narrated in 602 languages.sats4ai.com · read 7 Oct 2026

Payment and access

The service charges per use in Bitcoin Lightning sats and requires no account or card.sats4ai.com · read 7 Oct 2026

Privacy

Sats4AI says it does not create customer accounts or sell usage data, and describes keeping operational records needed to deliver and protect the service.sats4ai.com · read 7 Oct 2026

Support

The company says it can be reached through its contact page and Nostr.sats4ai.com · read 7 Oct 2026

Voice cloning

The product page offers audiobook narration in the user's own cloned voice.sats4ai.com · read 7 Oct 2026

Voice options

Users choose among three quality tiers and select a voice before generation.sats4ai.com · read 7 Oct 2026

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