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129 lines
4.2 KiB
Markdown
129 lines
4.2 KiB
Markdown
---
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summary: "Use Gradium text-to-speech in OpenClaw"
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read_when:
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- You want Gradium for text-to-speech
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- You need Gradium API key, voice, or directive token configuration
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title: "Gradium"
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---
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[Gradium](https://gradium.ai) is a text-to-speech provider for OpenClaw. It renders standard audio replies (WAV), voice-note-compatible Opus output, and 8 kHz u-law audio for telephony surfaces.
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| Property | Value |
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| ------------- | ------------------------------------ |
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| Provider id | `gradium` |
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| Auth | `GRADIUM_API_KEY` or config `apiKey` |
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| Base URL | `https://api.gradium.ai` (default) |
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| Default voice | `Emma` (`YTpq7expH9539ERJ`) |
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## Install plugin
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Gradium is an official external plugin. Install it, then restart Gateway:
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```bash
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openclaw plugins install @openclaw/gradium-speech
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openclaw gateway restart
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```
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## Setup
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Create a Gradium API key, then expose it with an env var or the config key. Config takes precedence over the env var.
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<Tabs>
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<Tab title="Env var">
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```bash
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export GRADIUM_API_KEY="gsk_..."
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```
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</Tab>
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<Tab title="Config key">
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```json5
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{
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messages: {
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tts: {
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auto: "always",
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provider: "gradium",
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providers: {
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gradium: {
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apiKey: "${GRADIUM_API_KEY}",
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},
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},
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},
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},
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}
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```
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</Tab>
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</Tabs>
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## Config
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```json5
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{
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messages: {
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tts: {
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auto: "always",
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provider: "gradium",
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providers: {
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gradium: {
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speakerVoiceId: "YTpq7expH9539ERJ",
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// apiKey: "${GRADIUM_API_KEY}",
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// baseUrl: "https://api.gradium.ai",
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},
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},
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},
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},
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}
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```
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| Key | Type | Description |
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| ----------------------------------------------- | ------ | --------------------------------------------------------------------------------- |
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| `messages.tts.providers.gradium.apiKey` | string | Resolved API key. Supports `${ENV}` and secret refs. |
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| `messages.tts.providers.gradium.baseUrl` | string | API origin override. Trailing slashes stripped. Default `https://api.gradium.ai`. |
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| `messages.tts.providers.gradium.speakerVoiceId` | string | Default voice id used when no directive override is present. |
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Output format is chosen automatically by target surface (see [Output](#output)) and is not configurable in `openclaw.json`.
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## Voices
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| Name | Voice ID |
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| ------------------ | ------------------ |
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| Arthur | `3jUdJyOi9pgbxBTK` |
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| Christina | `2H4HY2CBNyJHBCrP` |
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| Emma **(default)** | `YTpq7expH9539ERJ` |
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| John | `KWJiFWu2O9nMPYcR` |
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| Kent | `LFZvm12tW_z0xfGo` |
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| Sydney | `jtEKaLYNn6iif5PR` |
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| Tiffany | `Eu9iL_CYe8N-Gkx_` |
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### Per-message voice override
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When the active speech policy allows voice overrides, switch voices inline with a directive token (any of these are equivalent, all take a provider-native voice id):
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```text
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/voice:LFZvm12tW_z0xfGo
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/voice_id:LFZvm12tW_z0xfGo
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/voiceid:LFZvm12tW_z0xfGo
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/gradium_voice:LFZvm12tW_z0xfGo
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/gradiumvoice:LFZvm12tW_z0xfGo
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```
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If the speech policy disables voice overrides, the directive is consumed but ignored.
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## Output
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Output format is selected by target surface; the provider does not synthesize other formats.
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| Target | Format | File ext | Sample rate | Voice-compatible flag |
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| -------------- | ----------- | -------- | ----------- | --------------------- |
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| Standard audio | `wav` | `.wav` | provider | no |
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| Voice note | `opus` | `.opus` | provider | yes |
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| Telephony | `ulaw_8000` | n/a | 8 kHz | n/a |
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## Auto-select order
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Among configured TTS providers, Gradium's auto-select order is `30`. See [Text-to-Speech](/tools/tts) for how OpenClaw picks the active provider when `messages.tts.provider` is not pinned.
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## Related
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- [Text-to-Speech](/tools/tts)
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- [Media Overview](/tools/media-overview)
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