OpenAI TTS-1 Text-to-Speech (x402)

x402

OpenAI TTS-1 Text-to-Speech (x402) is a paid API for AI agents from openai.mm.family, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).

Converts text to speech audio using OpenAI's TTS-1 model, billed per call in USDC via x402 micropayment protocol

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

tts-1: OpenAI TTS 1 text to speech, paid per call in USDC. OpenAI list $15 per 1M characters, plus $0.0005 (Base) or $0.0005 (Solana) per call; up to 4096 characters; voices: alloy, ash, coral, echo, fable, onyx, nova, sage, shimmer. Returns the audio bytes (mp3 by default). Rates: https://openai.mm.family/x402/pricing

Output

Binary audio bytes (MP3 by default) containing synthesized speech of the input text. The response content-type is audio/mpeg for MP3, with other formats available (opus, aac, flac, wav, pcm) depending on the response_format parameter. Maximum input is 4096 characters per call.

Example use cases

Podcast intro narration

“Turn this script into spoken audio using the shimmer voice in MP3 format: 'Welcome to Tech Horizons, the podcast where we explore the future of artificial intelligence and the humans shaping it.'”

Accessibility audio for article

“Generate an audio version of this article summary using the alloy voice at 0.9 speed so I can add it to my blog post: 'Climate scientists have recorded the hottest average global temperature in recorded history this past July.'”

Voice assistant response recording

“Synthesize this customer support response in the onyx voice and return it as a WAV file: 'Thank you for reaching out. Your order has been shipped and will arrive within 3 to 5 business days.'”

Technical details

Endpoint

POSThttps://openai.mm.family/x402/v1/models/tts-1/audio/speech?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need standard-quality, cost-efficient AI speech synthesis billed per call via USDC micropayments (x402 protocol) without API key management. Prefer tts-1 over tts-1-hd when audio quality is acceptable at lower cost ($15/1M chars vs $30/1M chars). Best for agents needing pay-per-use audio generation without subscription overhead, or when integrating into crypto-native workflows on Base or Solana.

Side effects

Input text exceeds 4096 character limit — request will be rejected
Invalid voice enum value — must be one of alloy, ash, coral, echo, fable, onyx, nova, sage, shimmer
Invalid response_format — must be one of mp3, opus, aac, flac, wav, pcm
Payment failure via x402 micropayment protocol — USDC payment not accepted or insufficient
Model field not set to 'tts-1' — only this model is accepted at this endpoint
Empty input string — no audio generated

Input

Schema · Request body

Field	Type	Description
input	string
model	string
speed	number
voice	string
instructions	string
response_format	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "body": "binary audio bytes (mp3 by default)",
    "content_type": "audio/mpeg"
  }
}

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