OpenAI TTS-1-HD (High Definition Text-to-Speech)

x402

OpenAI TTS-1-HD (High Definition Text-to-Speech) 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 high-definition audio speech using OpenAI's TTS-1-HD model, returning audio bytes in formats like MP3, OPUS, AAC, FLAC, WAV, or PCM, paid per call in USDC.

Price / call$0.001

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StatusUnknown

How this service works

tts-1-hd: OpenAI TTS 1 HD text to speech, paid per call in USDC. OpenAI list $30 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

Returns binary audio bytes (MP3 by default, or the requested format) containing the synthesized speech. The response content type is audio/mpeg for MP3. The audio faithfully renders the input text using the selected voice in high-definition quality, with optional speed adjustments.

Example use cases

Podcast intro narration

“Generate a high-quality spoken intro for my podcast using the shimmer voice: 'Welcome back to The Future Now, the show where we explore how technology is reshaping everyday life. I'm your host, and today we have a fascinating guest joining us.' Give me the audio as an MP3.”

Accessibility audio for article

“Turn this article summary into speech using the alloy voice so visually impaired users can listen to it: 'Scientists have discovered a new species of deep-sea fish capable of producing bioluminescent patterns never seen before in marine biology.' I need high-definition audio quality.”

E-learning course voiceover

“Create a voiceover narration using the onyx voice for my e-learning slide: 'In this module, we will cover the fundamentals of machine learning, including supervised and unsupervised techniques, and walk through real-world examples.' Please output it in WAV format.”

Technical details

Endpoint

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

When to prefer

Choose this endpoint over tts-1 when you need higher audio quality and fidelity, such as for professional voiceovers, podcasts, audiobooks, or any production-quality audio output. The HD model costs more ($30/1M characters vs $15/1M for tts-1) but produces noticeably better audio. Prefer over gpt-4o-mini-tts when you want the dedicated TTS-1-HD model specifically. Best when you need one of the nine supported voices (alloy, ash, coral, echo, fable, onyx, nova, sage, shimmer) and control over audio format.

Side effects

Input text exceeds 4096 character limit — request rejected
Invalid voice name specified — validation error
Insufficient USDC balance for payment — 402 Payment Required
Unsupported response_format value — validation error
Network timeout for longer text segments
Empty input string — may return error or silence

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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