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x402engine Voxtral Mini TTS via OpenRouter
x402
x402engine Voxtral Mini TTS via OpenRouter is a paid API for AI agents from x402engine.app, paid per call via x402, $0.06/call, status unknown (last checked 2026-10-16).
Converts up to 2000 bytes of text into MP3 audio using Voxtral Mini, offering 30 preset voices across English, British, and French accents with emotional tones
Price / call$0.06
Success—
StatusUnknown
How this service works
x402engine — Voxtral Mini TTS through OpenRouter; 30 voices, MP3 audio, up to 2000 UTF-8 bytes of text
Output
A JSON object containing a base64-encoded MP3 audio string and the format field ('mp3'). The agent decodes the base64 string to obtain playable or saveable audio bytes.
Example use cases
Voiceover for product announcement
“Read this announcement aloud using the en_paul_excited voice and give me an MP3: 'We're proud to introduce our brand new platform — faster, smarter, and built for you.'”
French-accented narration for language app
“Synthesize this sentence in French-accented audio using the fr_marie_neutral voice: 'Bonjour, bienvenue dans notre application d'apprentissage.'”
Emotional customer service audio response
“Generate a calm, confident spoken response for my chatbot using the gb_oliver_confident voice: 'Your order has been confirmed and will arrive within three business days.'”
Technical details
Endpoint
POSThttps://x402engine.app/api/tts/openrouter?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need pay-per-call TTS with no subscription, want a specific emotional tone or accent (30 presets across American, British, and French voices), and need MP3 output in a single low-latency call. Ideal for agents that generate dynamic audio on demand without managing API keys for a dedicated TTS provider.
Side effects
- Text exceeds 2000 UTF-8 bytes — request rejected with validation error
- Invalid or unsupported voice enum value — returns error
- Empty text field — returns validation error
- Payment failure (HTTP 402) if USDC micropayment is not completed
- Network timeout if OpenRouter backend is slow or unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"audio": "<base64-encoded audio>",
"format": "mp3"
}
}Tags
x402
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