Cartesia · Speech

Cartesia / Text to speech

Turns a transcript into speech with Sonic (mp3 or wav). The reply is audio, stored as a media file on the run. Bring your own key: runs on your Cartesia account, which bills you; looot charges $0.

Live data

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Published API evidence

Public metadata only. Response bodies, credentials, and internal review notes are never displayed.

No verification date is claimed. No response capture is claimed.

Request parameters

language body · optional
model_id body · required
output_format body · required
speed body · optional
transcript body · required
voice body · required
cartesia_version header · optional
Cartesia-Version header, default 2026-08-14.

No allowlisted official documentation or pricing reference is available.