OpenAI Text to Speech (TTS) via x402

x402

OpenAI Text to Speech (TTS) via 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 spoken audio using OpenAI TTS models (gpt-4o-mini-tts, tts-1, tts-1-hd), returning audio bytes paid per call in USDC via x402

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

OpenAI text to speech (gpt-4o-mini-tts, tts-1, tts-1-hd), paid per call in USDC. OpenAI list $15 / $30 per 1M characters (tts-1 / tts-1-hd) or $12 per 1M audio tokens (gpt-4o-mini-tts, quoted at 4 per character), plus $0.0005 (Base) or $0.0005 (Solana) per call; up to 4096 characters. Standard OpenAI body (input, voice, response_format, speed). Returns the audio bytes. One endpoint per model: /x402/v1/models/<key>/audio/speech. Rates: https://openai.mm.family/x402/pricing

Output

Binary audio bytes (default MP3, or the format specified via response_format such as opus, aac, flac, wav, or pcm) representing the synthesized speech of the input text, with content-type audio/mpeg or appropriate audio MIME type.

Example use cases

Podcast intro narration generation

“Turn this script into spoken audio using the tts-1-hd model and the 'nova' voice as an MP3: 'Welcome back to The Daily Digest. Today we're covering the top five stories shaping the world of technology.'”

Accessibility audio for article

“Read this article summary aloud using the gpt-4o-mini-tts model with the 'shimmer' voice at 0.9 speed and give me the audio as a WAV: 'Researchers have discovered a new method for carbon capture that could reduce atmospheric CO2 by up to 30 percent by 2050.'”

E-learning course voiceover

“Generate a voiceover for my online course slide using tts-1, the 'onyx' voice, and opus format: 'In this module, you will learn the fundamentals of machine learning, including supervised and unsupervised techniques.'”

Technical details

Endpoint

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

When to prefer

Choose this endpoint when you need high-quality OpenAI TTS audio generation with per-call USDC micropayment billing via the x402 protocol, especially if you want access to multiple model tiers (gpt-4o-mini-tts for cost efficiency, tts-1 for standard quality, tts-1-hd for high fidelity) and flexible audio output formats without managing OpenAI API keys directly.

Side effects

Input text exceeds 4096 character limit — request rejected
Invalid or unsupported voice name — model may error or use a default
Payment failure via x402 — call not processed
Unsupported response_format value — schema validation error
Model enum value not recognized — returns error
Empty input string — may return silence or error

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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