> This is a page from the ElevenLabs documentation. For a complete page index, fetch https://elevenlabs.io/docs/llms.txt. For the full documentation in a single file, fetch https://elevenlabs.io/docs/llms-full.txt.

# Speech Engine Upstream

> ElevenLabs provides APIs and SDKs for text to speech, voice cloning, speech to text, sound effects, voice isolator, voice changer, and conversational AI agents. Build voice-enabled applications with lifelike audio generation.


## API Docs

- Speech Engine Upstream [Speech Engine Upstream](https://elevenlabs.io/docs/eleven-agents/api-reference/speech-engine-upstream/speech-engine-upstream.md)

## AsyncAPI Specification

The raw AsyncAPI 2.6.0 specification for the WebSocket channels is available at:
- [AsyncAPI JSON](https://elevenlabs.io/docs/asyncapi.json)
- [AsyncAPI YAML](https://elevenlabs.io/docs/asyncapi.yaml)