# Cluster Protocol Text-to-Speech

> Cluster Protocol Text-to-Speech is a paid API for AI agents from api.clusterprotocol.ai, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-13).

Converts input text into spoken audio using Cluster Protocol's AI-powered speech synthesis engine

## Facts

- Endpoint: POST https://api.clusterprotocol.ai/v1/audio/speech
- Price: $0.015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cluster-protocol-text-to-speech-d73921af
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0BxkcUEIyckcvzwJfnZ2Y

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 cluster-protocol-text-to-speech-d73921af -d '<json body>'
```

Example prompt: Can you read this paragraph aloud for me and give me an audio file — use a natural-sounding voice: 'Welcome to Cluster Protocol, the liberation engine for the internet capital market.'

## When to prefer this

Choose this endpoint when you need pay-per-call text-to-speech via the x402 micropayment protocol and want no subscription commitment; particularly suited for AI agents operating in decentralized or crypto-native environments that support USDC payments.

## Known failure modes

- Text input too long — exceeds character or token limit
- Invalid or unsupported voice/language parameter
- Payment authorization failure via x402 protocol
- Empty or missing text body returns 400 error
- Service unavailable or rate limit exceeded returns 5xx error

## How this service works

Liberation Engine for Internet Capital Market

## Output

An audio file (likely MP3 or WAV) containing the synthesized speech of the provided text, generated by Cluster Protocol's AI voice engine.

## Request schema (JSON Schema)

```json
{
 "input": {
  "type": "object",
  "required": [
   "model",
   "input"
  ],
  "properties": {
   "model": {
    "type": "string",
    "description": "TTS model slug"
   },
   "input": {
    "type": "string",
    "description": "Text to synthesize"
   },
   "voice": {
    "type": "string",
    "description": "Voice preset (e.g. 'alloy', 'nova')"
   },
   "speed": {
    "type": "number",
    "minimum": 0.25,
    "maximum": 4
   }
  }
 },
 "output": {
  "type": "string",
  "format": "binary",
  "description": "Audio stream (audio/mpeg)"
 },
 "properties": {
  "input": {
   "properties": {
    "method": {
     "type": "string",
     "enum": [
      "POST"
     ]
    }
   },
   "required": [
    "method"
   ]
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cluster-protocol-text-to-speech-d73921af/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.clusterprotocol.ai](https://www.zero.xyz/host/api.clusterprotocol.ai/llms.txt)