Varosity

Cartesia Sonic 2 API

$0.378/min on Varosity credits ($0.360/min with your own key).

Try Cartesia Sonic 2 Get an API key

no cartesia account needed · no subscription · failed renders never billed

Best for

  • ultra-low latency (~90ms)
  • natural prosody
  • large public voice library

Trade-offs

  • voice ids are library-specific — call list_voices

Call it from your code

One Varosity key works for every model.

curl -X POST https://varosity.ai/api/v1/tts \
  -H "Authorization: Bearer $VAROSITY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "text": "Welcome to the launch. Here's what's new this week.",
    "voiceModel": "cartesia-sonic-2"
  }'

Or ask your agent

Connect Claude, Cursor, or any MCP client to https://varosity.ai/api/mcp with your key, then say:

"Use Varosity with cartesia-sonic-2 to read this script aloud: …"
Agent setup guide

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