Hamza Baig
06/08/2026, 7:09 PMChiranjeet Mishra
06/08/2026, 8:34 PMcurl -X PATCH https://api.vapi.ai/assistant/YOUR_ASSISTANT_ID \ -H "Authorization: Bearer YOUR_VAPI_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "voice": { "provider": "cartesia", "voiceId": "bd9120b6-7761-47a6-a446-77ca49132781" } }'
Docs:
• [Update Assistant API](https://docs.vapi.ai/api-reference/assistants/update)
• [Provider Keys](https://docs.vapi.ai/customization/provider-keys)
If your Cartesia key is already validated in Dashboard -> Integrations, this should assign the voice even if it does not appear in assistant search.Hamza Baig
06/10/2026, 4:59 PMChiranjeet Mishra
06/10/2026, 9:20 PMChiranjeet Mishra
06/11/2026, 1:56 PM