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OpenAI Whisper Large v3 Audio Transcription
OpenAI Whisper Large v3 Audio Transcription is a paid API for AI agents from audio.withzero.xyz, paid per call via MPP, $0.002/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 spoken audio (WAV or MP3, up to 15 MB base64-encoded) to text using OpenAI Whisper Large v3
Price / call$0.002
Success—
StatusUnknown
How this service works
Transcribe spoken audio to text with OpenAI Whisper Large v3.
Output
Returns a JSON object containing the full text transcript of the audio, the detected duration of the audio in seconds, the model name used (whisper-large-v3), and the USDC cost of the request.
Example use cases
Example prompt
“Can you transcribe this MP3 audio file for me using Whisper Large v3? Here's the base64-encoded audio data: [base64string]”
Technical details
Endpoint
POSThttps://audio.withzero.xyz/api/v1/transcripts/whisper-large-v3?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need high-accuracy speech-to-text transcription using OpenAI's Whisper Large v3 model, especially for WAV or MP3 files up to 15 MB. Prefer this over the GPT-4o Transcribe endpoint when cost-efficiency or Whisper-specific behavior is required. Best suited for batch transcription of recorded audio, interviews, meetings, or podcasts.
Side effects
- Audio exceeds 15 MB decoded size — request rejected
- Unsupported format provided (anything other than wav or mp3) — validation error
- Malformed or invalid base64 encoding — decoding error
- Audio contains no detectable speech — empty or near-empty transcript returned
- Network timeout on large audio files — request fails with timeout error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| audiorequired | string | Base64-encoded audio to transcribe (decoded size up to 15 MB). |
| formatrequired | string | Container format of the audio. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| textrequired | string | The transcript of the audio. |
| modelrequired | string | The model that produced the transcript. |
| secondsrequired | number | Detected duration of the input audio in seconds. |
| price_usdcrequired | string | The amount charged for this request, in USDC. |
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