AI API Router Directory

Cartesia provides Sonic text to speech, Ink speech to text and Managed Agents voice agents, priced through credits and prepaid agent minutes with unlimited workspace seats on every plan. The Free plan costs $0 and includes 20,000 credits per month (about 27 minutes of Sonic-3.6 text to speech) plus $1 of prepaid agent minutes; Pro is $5 per month with 100,000 credits, Startup is $49 per month with 1.25M credits, and Scale is $299 per month with 8M credits. Agent calls bill at $0.06 per minute on every tier, and telephony is $0.014 per minute when using a Cartesia-provided phone number.

Free plan grants 20,000 credits per month (about 27 minutes of Sonic-3.6 text to speech) plus $1 of prepaid agent minutes; the credits are worth about $1.00 at the Pro plan rate of $5 per 100,000 credits, giving roughly $2.00 combined, an estimate because Cartesia does not price the free allowance in USD (cartesia.ai/pricing, checked 2026-09-16).