# Nova TTS — Text-to-Speech API

> Nova TTS — Text-to-Speech API is a paid API for AI agents from nuvo.orbonomy.xyz, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-16).

Converts text to synthesized speech audio, returning binary audio data, billed per call in USDC on Base.

## Facts

- Endpoint: POST https://nuvo.orbonomy.xyz/api/tts
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nova-tts-text-to-speech-api-9a0705cf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jTNOBy5TPJc0fka_FExgo

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability nova-tts-text-to-speech-api-9a0705cf -d '<json body>'
```

Example prompt: Can you convert this text to speech using the Nova API: 'Welcome to our platform, we are glad to have you here.' — use the default voice and give me back the audio file.

## When to prefer this

Choose this endpoint when you need pay-per-call text-to-speech synthesis billed in USDC on Base without a subscription, and want a simple POST with text input returning binary audio. Ideal for AI agents operating in crypto-native or x402-payment environments.

## Known failure modes

- Missing 'text' field returns a 400 validation error
- Text too long may result in a timeout or truncation
- Invalid voice name may fall back to default or return an error
- Payment failure (insufficient USDC balance) returns 402 Payment Required
- Service unavailability returns 503

## How this service works

Pay-per-call AI inference. Chat, reason, translate, analyze, generate. USDC on Base.

## Output

A binary audio file containing synthesized speech of the provided text, returned as a raw binary response ready for playback or storage.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "text"
 ],
 "properties": {
  "text": {
   "type": "string",
   "description": "Text to convert to speech"
  },
  "voice": {
   "type": "string",
   "description": "Voice name (optional)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "string",
 "format": "binary"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nova-tts-text-to-speech-api-9a0705cf/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nuvo.orbonomy.xyz](https://www.zero.xyz/host/nuvo.orbonomy.xyz/llms.txt)