agent402.tools Audio Transcription Pro

x402

agent402.tools Audio Transcription Pro is a paid API for AI agents from agent402.tools, paid per call via x402, $0.1/call, not verified (last probed 2026-10-30); live alternatives: Speech to Text Transcription ($0.01) and medien.halowerk.com Speech-to-Text ($0.04).

Agents call it through Zero, which pays per call: no API key and no wallet of your own. New accounts start with $5. Live alternatives for the same use case: Speech to Text Transcription ($0.01) · medien.halowerk.com Speech-to-Text ($0.04).

Transcribes audio files to text using OpenAI gpt-4o-transcribe at high accuracy, paid per-call via x402 with no API key required

Price / call$0.1

Seller volume →—

Success—

StatusUnknown

How this service works

Transcribe audio to text with the gpt-transcribe model - the same model as /api/transcribe with a longer cap. Provide a URL to an audio file and get back the transcript; add diarize:true for speaker labels, word timestamps and a language confidence score (the scribe-v2 model). No API key needed; pay per call via x402. Max 10 minutes of audio, 25 MB file size.

Output

Returns the full text transcript of the audio file, generated by OpenAI gpt-4o-transcribe. Supports audio up to 10 minutes and 25 MB in size.

Example use cases

Example prompt

“Can you transcribe this audio file for me? It's an English-language interview recording at https://example.com/interview.mp3 — I need the full text transcript.”

Technical details

Endpoint

POSThttps://agent402.tools/api/transcribe-pro?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need high-accuracy speech-to-text transcription powered by OpenAI gpt-4o-transcribe without managing your own API keys, and your audio is accessible via a public URL within 10 minutes / 25 MB. It is ideal for agents that handle sporadic transcription tasks and want to pay per call rather than maintain a subscription.

Side effects

Audio file URL is unreachable or returns a non-200 response
File exceeds 25 MB size limit
Audio exceeds 10 minutes in length
Unsupported audio format (not mp3, wav, m4a, ogg, flac, or webm)
Invalid or unparseable language code provided
Payment via x402 fails or insufficient USDC balance
Audio file contains no discernible speech

Input

Schema · Request body

Field	Type	Description
url	string	URL of the audio file to transcribe (mp3, wav, m4a, ogg, flac, webm)
diarize	boolean	true: transcribe with the scribe-v2 model and add speaker labels and word timestamps (`words`, `speakers`) and `language_confidence` (0 to 1, the model's confidence in the detected language). Same price and cap. Default false
language	string	Optional ISO-639-1 language code (e.g. 'en', 'es', 'fr') for better accuracy

Output

Schema · Response

{
  "type": "json",
  "example": {
    "text": "Hi, this is the Agent402 sample recording. Can you hear me clearly? Yes, loud and clear. There are two of us on this clip, so the transcript can tell us apart.",
    "model": "gpt-transcribe",
    "duration": 12.6,
    "language": "en",
    "provider": "openai"
  }
}

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