# Nova TTS — Text-to-Speech API

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

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

## Facts

- Endpoint: POST https://novva.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-cf478094
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ScmUaylt6Cn7J89JXzryJ

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-cf478094 -d '<json body>'
```

Example prompt: Can you read this text aloud using Nova's TTS API: 'Welcome to our platform. We're glad you're here.' — use the default voice.

## When to prefer this

Choose this endpoint when you need a pay-per-call, no-subscription TTS service that settles in USDC on Base. Ideal for agents operating in crypto-native or x402 payment environments that need voice output on demand without a monthly commitment.

## Known failure modes

- Empty or missing 'text' field returns a 400 Bad Request
- Invalid voice name may cause a 400 or fall back to default voice
- Payment not received or insufficient USDC balance results in 402 Payment Required
- Text too long may exceed server limits, returning a 413 or 400 error
- 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 containing the synthesized speech corresponding to the provided text input, ready to be played back 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-cf478094/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from novva.orbonomy.xyz](https://www.zero.xyz/host/novva.orbonomy.xyz/llms.txt)