# Cartesia STT WebSocket API

**Canonical:** https://apis.io/apis/cartesia-ai/cartesia-ai-stt-websocket-api/  
**Provider:** Cartesia — https://apis.io/providers/cartesia-ai/  
**Base URL:** wss://api.cartesia.ai  
**Documentation:** https://docs.cartesia.ai/api-reference/stt/websocket

Cartesia STT WebSocket API is one of 21 APIs that [Cartesia](https://apis.io/providers/cartesia-ai/) publishes on the [APIs.io](https://apis.io/) network, described by an AsyncAPI event-driven specification. Tagged areas include WebSocket, Speech-to-Text, Real-Time, and Turn Detection. The published artifact set on APIs.io includes API documentation, an API reference, and an AsyncAPI specification.

Realtime transcription over WebSocket at wss://api.cartesia.ai/stt/websocket. Clients stream raw binary audio in 100ms chunks and issue finalize/close text commands; the server returns incremental and final transcript messages with word-level timing. A companion "Auto" variant at /stt/turns/websocket adds built-in turn detection for conversational agents.

## Machine-readable artifacts (3)

- **Documentation** — https://docs.cartesia.ai/api-reference/stt/turns/websocket
- **APIReference** — https://docs.cartesia.ai/api-reference/stt/websocket
- **AsyncAPI** — https://raw.githubusercontent.com/api-evangelist/cartesia-ai/refs/heads/main/asyncapi/cartesia-ai-asyncapi.yml

## Other Cartesia APIs (12)

- [Cartesia TTS WebSocket API](https://apis.io/apis/cartesia-ai/cartesia-ai-tts-websocket-api/)
- [Cartesia Agents API](https://apis.io/apis/cartesia-ai/cartesia-ai-agents-api/)
- [Cartesia API Keys API](https://apis.io/apis/cartesia-ai/cartesia-ai-api-keys-api/)
- [Cartesia Auth API](https://apis.io/apis/cartesia-ai/cartesia-ai-auth-api/)
- [Cartesia Calls API](https://apis.io/apis/cartesia-ai/cartesia-ai-calls-api/)
- [Cartesia Datasets API](https://apis.io/apis/cartesia-ai/cartesia-ai-datasets-api/)
- [Cartesia Deployments API](https://apis.io/apis/cartesia-ai/cartesia-ai-deployments-api/)
- [Cartesia Infill API](https://apis.io/apis/cartesia-ai/cartesia-ai-infill-api/)
- [Cartesia Knowledge Base API](https://apis.io/apis/cartesia-ai/cartesia-ai-knowledge-base-api/)
- [Cartesia Metrics API](https://apis.io/apis/cartesia-ai/cartesia-ai-metrics-api/)
- [Cartesia Phone Numbers API](https://apis.io/apis/cartesia-ai/cartesia-ai-phone-numbers-api/)
- [Cartesia Pronunciation Dictionaries API](https://apis.io/apis/cartesia-ai/cartesia-ai-pronunciation-dictionaries-api/)

## Tags

WebSocket, Speech-to-Text, Real-Time, Turn Detection

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/cartesia-ai/cartesia-ai-stt-websocket-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/cartesia-ai/.