# kino402 ElevenLabs TTS

> kino402 ElevenLabs TTS is a paid API for AI agents from kino402.com, paid per call via x402, $0.12/call, status unknown (last checked 2026-09-16).

Converts text to spoken audio using ElevenLabs voice synthesis (voice ID 21m00Tcm4TlvDq8ikWAM), returning an MP3 audio file

## Facts

- Endpoint: POST https://kino402.com/v1/audio/tts
- Price: $0.12/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/kino402-elevenlabs-tts-8a633f96
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3pL3ZoABarb-378SsdE-_

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 kino402-elevenlabs-tts-8a633f96 -d '<json body>'
```

Example prompt: Read this aloud and give me an MP3: 'Welcome to our platform. We're glad you're here.' Use the ElevenLabs Rachel voice.

## When to prefer this

Choose this endpoint when you need ElevenLabs-quality neural TTS via a pay-per-call x402 micropayment model, without managing an ElevenLabs API key. Ideal for agents that need on-demand speech synthesis for short text snippets (the pricing is parametric and quoted per body). Prefer this over self-hosted TTS when voice quality matters and per-call costs are acceptable.

## Known failure modes

- Input text too long or exceeds body size limit (16 KB) — returns 402 or 4xx error
- Malformed JSON body — returns 400 bad request
- Payment not provided — returns 402 with exact price quote for the submitted body
- Voice ID unavailable or ElevenLabs upstream error — returns 5xx
- Empty input text — may return empty or error response

## How this service works

ElevenLabs TTS: 29 characters, voice 21m00Tcm4TlvDq8ikWAM

## Output

A binary MP3 audio file (~1 KB per spoken word) containing the synthesized speech. The agent receives raw audio/mpeg bytes that can be saved, streamed, or embedded in media workflows.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "description": "a JSON body, up to 16 KB. The price is parametric: an unpaid POST answers 402 with the exact quote for the body you sent."
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "type": "string",
     "const": "POST"
    },
    "bodyType": {
     "type": "string",
     "const": "json"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type",
    "format"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "text"
    },
    "format": {
     "type": "string",
     "const": "audio/mpeg",
     "description": "the spoken audio as an mp3 response body"
    },
    "example": {
     "description": "a sample response from the real code path"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "text",
 "format": "audio/mpeg",
 "example": "binary audio/mpeg response body (~1 KB per spoken word)"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/kino402-elevenlabs-tts-8a633f96/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from kino402.com](https://www.zero.xyz/host/kino402.com/llms.txt)