## HandshakeTry it

WSS

wss://api.hume.ai/v0/tts/stream/input

### Query parameters

#### access_token  
string Optional  
Defaults to ``  
Access token used for authenticating the client. If not provided, an `api_key` must be provided to authenticate.  
The access token is generated using both an API key and a Secret key, which provides an additional layer of security compared to using just an API key.  
For more details, refer to the [Authentication Strategies Guide](https://dev.hume.ai/docs/introduction/api-key#authentication-strategies).

#### context_generation_id  
string Optional  
The ID of a prior TTS generation to use as context for generating consistent speech style and prosody across multiple requests. Including context may increase audio generation times.

#### format_type  
enum Optional  
The format to be used for audio generation.

**Show 1 variants**

#### include_timestamp_types  
list of enums Optional  
Defaults to `[]`  
The set of timestamp types to include in the response. Only supported for Octave 2 requests.  
Allowed values: word, phoneme

#### instant_mode  
boolean Optional  
Defaults to `true`  
Enables ultra-low latency streaming, significantly reducing the time until the first audio chunk is received. Recommended for real-time applications requiring immediate audio playback. For further details, see our documentation on [instant mode](https://dev.hume.ai/docs/text-to-speech-tts/overview#ultra-low-latency-streaming-instant-mode).

#### no_binary  
boolean Optional  
Defaults to `false`  
If enabled, no binary websocket messages will be sent to the client.

#### strip_headers  
boolean Optional  
Defaults to `false`  
If enabled, the audio for all the chunks of a generation, once concatenated together, will constitute a single audio file. Otherwise, if disabled, each chunk’s audio will be its own audio file, each with its own headers (if applicable).

#### temperature  
double Optional  
Sampling temperature for the speech generation model. Higher values increase variation; lower values increase consistency.

**This is an experimental parameter.** It is recommended to use the default values for most use cases.

Defaults when omitted:

- Octave 1 voice creation (no voice specified): `0.9`
- Octave 1 text-to-speech: `0.8`
- Octave 2 text-to-speech: `0.75`

#### version  
enum Optional  
The version of the Octave Model to use. 1 for the legacy model, 2 for the new model.

**Show 1 variants**

#### api_key  
string Optional  
Defaults to ``  
API key used for authenticating the client. If not provided, an `access_token` must be provided to authenticate.  
For more details, refer to the [Authentication Strategies Guide](https://dev.hume.ai/docs/introduction/api-key#authentication-strategies).

### Send

#### InputMessage  
object Required  
Input message type for the TTS stream.  
**Show 7 properties**

### Receive

#### TtsOutput  
object Required  
Output message type for the TTS stream.  
**Show 2 variants**

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