# Cartesia TTS WebSocket API

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

Cartesia TTS 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, Text-to-Speech, Real-Time, and Streaming. The published artifact set on APIs.io includes API documentation and an AsyncAPI specification.

Bidirectional, multiplexed WebSocket at wss://api.cartesia.ai/tts/websocket for realtime speech generation. Clients send JSON generation requests keyed by a context_id (continuing a context preserves prosody across chunks of transcript) and receive base64-encoded audio chunks, optional word and phoneme timestamps, flush acknowledgements, and a final done message. A single connection scales to dozens of concurrent generation contexts.

## Machine-readable artifacts (3)

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

## Other Cartesia APIs (12)

- [Cartesia STT WebSocket API](https://apis.io/apis/cartesia-ai/cartesia-ai-stt-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, Text-to-Speech, Real-Time, Streaming

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