Cartesia Voice API Free Tier (20K credits per month)

Free tier ($0) gives 20K credits per month plus $1 per month of prepaid agent credit; pay as you go for usage, and the paid Pro tier starts at 100K credits per month

Verbatim from the official pricing page: "Pricing for every stage. Start free, scale as you ship. Pay for the credits and agent minutes you use, with unlimited workspace seats on every plan." Free tier card: "$0 / 20K credits / month / $1 prepaid agents / month"; Pro tier 100K credits / month + $5 prepaid agent credit, Startup tier 1250K credits / month. All plans have unlimited workspace seats.

⚠️The official pricing page does not say how many characters / seconds 1 credit equals, so confirm the voice duration the free allowance converts to in the official docs or the console. The sign-up method and whether a card is required were not verified by completing sign-up. Reachability from mainland China was not tested.