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agent402.tools Audio Transcription
x402
agent402.tools Audio Transcription is a paid API for AI agents from agent402.tools, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-14, last successful call 2026-07-23).
Transcribes an audio file (given by URL) to text using OpenAI gpt-4o-mini-transcribe, with per-call payment via x402
Price / call$0.03
Success95%
StatusUnknown
How this service works
Transcribe audio to text using OpenAI (gpt-4o-mini-transcribe). Provide a URL to an audio file (mp3, wav, m4a, etc.) and get back the transcript. No API key needed; pay per call via x402. Max 5 minutes of audio, 25 MB file size.
Output
A plain-text transcript of the spoken content in the provided audio file, extracted using OpenAI's gpt-4o-mini-transcribe model. Covers up to 5 minutes of audio and files up to 25 MB.
Example use cases
Example prompt
“Can you transcribe this audio file for me? It's an English podcast clip at https://example.com/clip.mp3 — just give me the full text of what's said.”
Technical details
Endpoint
POSThttps://agent402.tools/api/transcribeWhen to prefer
Choose this endpoint when you need quick, pay-per-call audio transcription with no API key setup, for audio files accessible via a public URL, up to 5 minutes long and 25 MB in size. Ideal for agents that handle occasional or one-off transcription tasks without committing to a subscription or managing OpenAI credentials directly.
Side effects
- Audio file URL is unreachable or returns a non-200 response — transcription fails
- File format not supported (only mp3, wav, m4a, ogg, flac, webm accepted)
- File exceeds 25 MB size limit — request rejected
- Audio duration exceeds 5 minutes — request rejected
- Invalid or unsupported ISO-639-1 language code provided — may fall back to auto-detect or error
- Payment via x402 not completed or insufficient — request blocked
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | URL of the audio file to transcribe (mp3, wav, m4a, ogg, flac, webm) |
| language | string | Optional ISO-639-1 language code (e.g. 'en', 'es', 'fr') for better accuracy |
Output
Schema · Response
{
"type": "json",
"example": {
"text": "Hello, this is a sample transcription.",
"model": "gpt-4o-mini-transcribe",
"duration": 3.5,
"language": "en",
"provider": "openai"
}
}Tags
x402
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Zero review prompt (fires after every successful call)
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