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x402-gateway Text-to-Speech (MeloTTS)
x402
x402-gateway Text-to-Speech (MeloTTS) is a paid API for AI agents from x402-gateway.blackwoodstate8.workers.dev, paid per call via x402, $0.023/call, status unknown (last checked 2026-10-22).
Converts short text (up to 1000 characters) into WAV audio using MeloTTS on Workers AI, returning base64-encoded audio in one of six languages, billed at $0.023 USDC per call.
Price / call$0.023
Success—
StatusUnknown
How this service works
Use when you need text to speech, tts, a voice audio file or spoken narration of a short text. Do not use for voice cloning, a chosen voice, SSML or audio longer than about two minutes. Returns JSON with text to speech (TTS): your text read aloud as WAV voice audio (base64, 44.1 kHz mono) by MeloTTS on Workers AI, in English, Spanish, French, Chinese, Japanese or Korean for 0.023 USDC per call. Typical response time 8000 ms (p95). Category: Media.
Output
A JSON object containing the base64-encoded WAV audio (44.1 kHz mono), the MIME type (audio/wav), byte count, character count, language code, and model name used. May also include a 'next' field suggesting a follow-up paid call in the same service family.
Example use cases
Multilingual product announcement narration
“Turn this Spanish text into a spoken audio file: 'Descubre nuestra nueva colección de primavera disponible ahora en tienda.'”
Accessibility audio for article snippet
“Generate an English audio narration of this text so I can add it to my article: 'Climate change is accelerating at an unprecedented rate, scientists warn.'”
Japanese language learning audio clip
“Read this Japanese sentence aloud and give me the audio file: '本日はお越しいただきありがとうございます。'”
Technical details
Endpoint
POSThttps://x402-gateway.blackwoodstate8.workers.dev/v1/text-to-speech?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, low-cost, multilingual text-to-speech conversion for short texts (under 1000 characters) without needing voice cloning, SSML markup, a specific speaker voice, or audio longer than roughly two minutes. It is well-suited for on-demand narration in six languages billed per call with no subscription required.
Side effects
- Text exceeds 1000-character limit — request rejected with validation error
- Unsupported language code provided — returns error indicating valid options (en, es, fr, zh, ja, ko)
- Empty or missing 'text' field — schema validation failure
- Payment not provided or insufficient USDC balance — x402 payment required error
- Timeout or Workers AI backend unavailability — 5xx error after ~8 seconds
- Text contains only whitespace — likely rejected by minLength:1 constraint
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"lang": "en",
"bytes": 348518,
"chars": 63,
"model": "@cf/myshell-ai/melotts",
"mimeType": "audio/wav",
"audioBase64": "UklGRl5RBQBXQVZFZm10IBAAAAABAAEARKwAAIhYAQACABAAZGF0YTpRBQAAAAAA...(464692 characters)"
}
}Tags
x402
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