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Agent402 Audio Transcription
x402
Agent402 Audio Transcription is a paid API for AI agents from agent402.tools, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-12).
Transcribes an uploaded audio file to text using GPT-based speech recognition, returning the transcript, model used, and audio duration.
Price / call$0.1
Success—
StatusUnknown
How this service works
OpenAI's transcription wire on the ten-minute tier: POST multipart/form-data with a `file` part. Same model as /v1/audio/transcriptions with a longer cap, for a recording a four-minute route refuses.
Output
Returns a JSON object containing: 'text' (the full transcript of the audio), 'model' (the transcription model used, e.g. 'gpt-transcribe'), and 'duration' (the length of the audio in seconds as a float).
Example use cases
Meeting recording to text notes
“I just uploaded a recording of our team standup meeting — can you transcribe it into text so I can turn it into meeting notes?”
Multilingual podcast transcription
“Transcribe this Spanish-language podcast episode for me — use 'es' as the language hint so the model gets the right context.”
Voice memo extraction
“I have a voice memo I recorded on my phone and I need the spoken words converted to text — can you run a transcription on the audio file?”
Technical details
Endpoint
POSThttps://agent402.tools/v1/pro/audio/transcriptions?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need pay-per-call audio transcription with no API key or signup required, especially in agentic workflows using x402 or MPP micropayment protocols. Ideal for one-off or low-volume transcription tasks where setting up a full OpenAI account is unnecessary. Prefer this over raw OpenAI API when you want metered, per-call billing in USDC without managing API credentials.
Side effects
- Unsupported audio format — endpoint may reject non-standard file types
- Audio too long or too large — may timeout or return an error for very large files
- Invalid or missing file part in multipart request — returns error
- Unrecognized language hint — may fall back to auto-detection or return an error
- Insufficient payment (x402) — call rejected if USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| file | string | The audio file, as a multipart part named `file` |
| diarize | string | "true" for speaker labels and word timestamps (the scribe-v2 model) |
| language | string | Optional ISO-639-1 hint |
Output
Schema · Response
{
"type": "json",
"example": {
"text": "Example transcript.",
"model": "gpt-transcribe",
"duration": 420.5
}
}Tags
x402
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