# Nova TTS — Text-to-Speech API

> Nova TTS — Text-to-Speech API is a paid API for AI agents from novav2.orbonomy.xyz, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-13).

Converts input text to synthesized speech audio, returning a binary audio file, paid per call in USDC on Base.

## Facts

- Endpoint: POST https://novav2.orbonomy.xyz/api/tts
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nova-tts-text-to-speech-api-aa5beaf2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XqUb0EVRmOr2xBAhGCP6w

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-aa5beaf2 -d '<json body>'
```

Example prompt: Can you read this text aloud using the Nova TTS API and give me the audio file? Use the 'alloy' voice and convert this script: 'Welcome to our product demo. Today we'll walk you through the key features.'

## When to prefer this

Choose this endpoint when you need pay-per-call text-to-speech synthesis without a subscription, billed in USDC on Base via x402 protocol. Useful for agents needing on-demand TTS without managing API keys or monthly plans.

## Known failure modes

- Missing required 'text' field returns validation error
- Text too long may cause timeout or truncation
- Invalid voice name may fall back to default or return error
- Payment failure (insufficient USDC) returns 402 Payment Required
- Binary response may be empty if TTS model fails internally

## 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. The response is raw audio data (binary format) that can be saved as a file and played back.

## 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-aa5beaf2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from novav2.orbonomy.xyz](https://www.zero.xyz/host/novav2.orbonomy.xyz/llms.txt)