# Nova TTS — Text-to-Speech API

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

Converts input text to synthesized speech audio, returning binary audio data, paid per call via USDC on Base.

## Facts

- Endpoint: POST https://ova.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-57b5c5ac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HS5wfA94IIJyHrOtCHNQT

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-57b5c5ac -d '<json body>'
```

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

## When to prefer this

Choose this endpoint when you need a pay-per-call, no-subscription TTS service that settles in USDC on Base via x402 protocol — ideal for agents operating in crypto-native or Web3 workflows where traditional API key billing is undesirable.

## Known failure modes

- Missing required 'text' field returns a 400 validation error
- Payment not included or insufficient USDC triggers a 402 Payment Required response
- Invalid voice name may return a 400 or fall back to default voice
- Extremely long text input may result in timeout or truncation
- Service unavailable returns 503 with no audio output

## How this service works

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

## Output

A binary audio stream (e.g. WAV or MP3) containing the synthesized speech of the submitted text, ready to be played or saved as an audio file.

## 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-57b5c5ac/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ova.orbonomy.xyz](https://www.zero.xyz/host/ova.orbonomy.xyz/llms.txt)