# Cartesia Sonic — card for AI agents

Sonic TTS API (Sonic 3.6 claims 44 languages) with instant and pro voice cloning.

Category: Voiceover (text-to-speech) · maker Cartesia · checked 2026-10-12

## Price
- Price: Free tier
- Free tier: 20K credits/month (1 credit = 1 character; one minute of audio is about 750-800 credits).
- Paid from $5/month
- Usage price: Pro $5/100K credits; Startup $49/1.25M; Scale $299/month.
- Pricing page: https://cartesia.ai/pricing

## License
not stated

- commercial: **conditions** (Commercial use with conditions)
  > unless commercial use is expressly permitted by your subscription tier
  (https://cartesia.ai/legal/terms)
- in app: **conditions** (Ship inside your app with conditions)
  > Paid self-serve plans: for teams shipping to production, includes commercial usage rights, higher credit allotments, higher concurrency, and faster generation
  (https://www.cartesia.ai/sonic)
- youtube: **conditions** (Monetized YouTube with conditions)
  > Narrate videos and tutorials in your own voice, and update scripts without re-recording.
  (https://www.cartesia.ai/product/voice-cloning)
- bots: **banned**
  > Use any robot, spider, crawlers, scraper, or other automatic device, process, software or queries
  (https://cartesia.ai/legal/terms)

## Rules to follow
- Use Pro or above for commercial use; the commercial use license is a Pro-plan addition.

## How an agent gets files
- TTS API with official client libraries; see https://docs.cartesia.ai/tools/client-libraries and the TTS guide at https://docs.cartesia.ai/build-with-cartesia/capability-guides/tts. (sign-in: api-key)
- Not allowed: Commercial use needs a plan that includes the commercial use license (listed from Pro).
- Not allowed: Free and Pro plans do not include Professional Voice Cloning.
- Not allowed: Terms bar robots, scrapers and automatic tools.

## How to connect
- Official MCP server
- API docs: https://docs.cartesia.ai (API key needed)
- npm: `npm install @cartesia/cartesia-js`
- PyPI: `pip install cartesia`
- Website: https://cartesia.ai

## Notes
Instant cloning from Pro; Pro Voice Clone needs Startup or above and 30+ minutes of audio.

## Lines to paste into your prompt or AGENTS.md

```
- Cartesia Sonic (Voiceover (text-to-speech)). Sonic TTS API (Sonic 3.6 claims 44 languages) with instant and pro voice cloning. Price: free tier; commercial use with conditions; ship inside your app with conditions; no bots or bulk downloading.
  Connect: API docs https://docs.cartesia.ai (API key needed); npm @cartesia/cartesia-js; PyPI cartesia.
  Get files: TTS API with official client libraries; see https://docs.cartesia.ai/tools/client-libraries and the TTS guide at https://docs.cartesia.ai/build-with-cartesia/capability-guides/tts.
  Not allowed: Commercial use needs a plan that includes the commercial use license (listed from Pro).
  Not allowed: Free and Pro plans do not include Professional Voice Cloning.
  Not allowed: Terms bar robots, scrapers and automatic tools.
  Rule: Use Pro or above for commercial use; the commercial use license is a Pro-plan addition.
```

Not verified: The free-plan commercial status is inferred from the plan table (ToS not read).

## Links
- AgentGid page: https://agentgid.com/assets/cartesia/
- Is it free for commercial use? https://agentgid.com/assets/cartesia/commercial-use/
- Source: https://cartesia.ai/pricing
- Source: https://docs.cartesia.ai/build-with-cartesia/tts-models/latest
- Source: https://docs.cartesia.ai/integrations/mcp
- Source: https://www.cartesia.ai/sonic
- Source: https://www.cartesia.ai/product/voice-cloning

---
AgentGid's catalog is curated: every entry was checked against the maker's official pages (registry, repository, license and pricing pages) on the date shown; a license value shows the quote it stands on wherever AgentGid has one. Usage numbers come from AgentGid's own scan of public repositories set up for AI coding agents. Claims by makers are reported, not tested by AgentGid.