Tool detail

Text-to-speech

Converts text to speech with OpenAI TTS-1, returning base64 audio in a chosen format and voice.

Categories: Speech audio

Use when

generate speech audio from text with a chosen voice
get TTS output as mp3, opus, aac, flac, wav or pcm

Not for

text capped at 2000 characters per call
for cheaper high-volume speech, the docs point to /api/tts-lite (Kokoro-82M, $0.005)

Inputs

POST JSON body: text (string, required, max 2000 chars), voice (string, optional, default alloy), format (string, optional, default mp3)

Admitted input schema

{
  "type": "object",
  "properties": {
    "format": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "Audio format: mp3, opus, aac, flac, wav, pcm (default: mp3)"
    },
    "text": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "Text to convert to speech (max 2000 chars)"
    },
    "voice": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "Voice: alloy, ash, ballad, coral, echo, fable, nova, onyx, sage, shimmer (default: alloy)"
    }
  },
  "required": [
    "text"
  ],
  "additionalProperties": false
}

Endpoint

Method: POST
URL: https://agent402.tools/api/tts

Payment

Protocol: x402
Listed price: $0.05 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: POST https://agent402.tools/api/tts
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z