Cartesia API

REST discovered

Details

URL: https://api.cartesia.ai
Docs: https://docs.cartesia.ai/use-the-api/api-conventions

Authentication

Cartesia API key api_key discovered Get key ↗

Authorization: Bearer <credential> /X-Api-Key: <credential>

Create an API key in the Cartesia Playground keys page. Use it from trusted server-side environments; docs show it in either the Authorization: Bearer <api_key> header or the X-Api-Key header. The key format is sk_car_....

OAuth 2.0 oauth2 discovered

Authorization: Bearer <credential> /?token=<credential>

OAuth 2.0 — self-onboarding

Point your MCP client at the server URL and approve access in the browser. The server supports OAuth Dynamic Client Registration (RFC 7591), so the client registers itself automatically — no developer-portal app, client_id, or client_secret to create.

Cartesia admin API key api_key discovered Get key ↗

Authorization: Bearer <credential>

If you are an organization admin, create an admin API key at the Cartesia Playground admin keys page. These keys are separate from standard API keys, use the format sk_car_admin_..., and are required for admin routes such as usage and API-key metadata. Send them as Authorization: Bearer <admin_api_key>.