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Inworld

Inworld is a streaming text-to-speech (TTS) provider. In OpenClaw it synthesizes outbound reply audio (MP3 by default, OGG_OPUS for voice notes) and PCM audio for telephony channels such as Voice Call.

OpenClaw posts to Inworld's streaming TTS endpoint, concatenates the returned base64 audio chunks into a single buffer, and hands the result to the standard reply-audio pipeline.

Detail	Value
Website	inworld.ai
Docs	docs.inworld.ai/tts/tts
Auth	text `INWORLD_API_KEY` (HTTP Basic, Base64 dashboard credential)
Default voice	text `Sarah`
Default model	text `inworld-tts-1.5-max`

Getting started

Set your API key

Copy the credential from your Inworld dashboard (Workspace > API Keys) and set it as an env var. The value is sent verbatim as the HTTP Basic credential, so do not Base64-encode it again or convert it to a bearer token.


text
```
INWORLD_API_KEY=<base64-credential-from-dashboard>
```

Select Inworld in messages.tts

```json5} { messages: { tts: { auto: "always", provider: "inworld", providers: { inworld: { voiceId: "Sarah", modelId: "inworld-tts-1.5-max", }, }, }, }, } ```

Send a message

Send a reply through any connected channel. OpenClaw synthesizes the audio with Inworld and delivers it as MP3 (or OGG\_OPUS when the channel expects a voice note).

Configuration options

Option	Path	Description
text `apiKey`	text `messages.tts.providers.inworld.apiKey`	Base64 dashboard credential. Falls back to text `INWORLD_API_KEY` .
text `baseUrl`	text `messages.tts.providers.inworld.baseUrl`	Override Inworld API base URL (default text `https://api.inworld.ai` ).
text `voiceId`	text `messages.tts.providers.inworld.voiceId`	Voice identifier (default text `Sarah` ).
text `modelId`	text `messages.tts.providers.inworld.modelId`	TTS model id (default text `inworld-tts-1.5-max` ).
text `temperature`	text `messages.tts.providers.inworld.temperature`	Sampling temperature text `0..2` (optional).

Notes

Text-to-speech

TTS overview, providers, and `messages.tts` config.

Configuration

Full config reference including `messages.tts` settings.

Providers

All bundled OpenClaw providers.

Troubleshooting

Common issues and debugging steps.

OpenClaw Docs