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WithZero Audio Transcription via GPT-4o (ZeroClick)
x402
WithZero Audio Transcription via GPT-4o (ZeroClick) is a paid API for AI agents from agents.withzero.xyz, paid per call via MPP or x402, $0.3/call, not verified (last probed 2026-10-28); 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 base64-encoded audio (WAV or MP3, up to 15 MB) to text using OpenAI's GPT-4o transcription model, billed per call via ZeroClick's x402 payment layer.
Price / call$0.3session · ~$0.30 to open
Success—
StatusUnknown
How this service works
Transcribe spoken audio to text with OpenAI's GPT-4o Transcribe.
Output
A text transcript of the spoken content in the submitted audio. The response contains the transcribed text produced by GPT-4o from the decoded audio data.
Example use cases
Voice memo to text conversion
“I have a base64-encoded WAV file of a voice memo I recorded this morning — can you transcribe it and give me the full text of what I said?”
Meeting recording transcript
“Here's a base64-encoded MP3 of a short meeting recording — please transcribe everything that was spoken so I can review it as text.”
Podcast clip transcription
“I've got a base64-encoded MP3 clip from a podcast episode — can you run it through GPT-4o and get me an accurate transcript of what's being said?”
Technical details
Endpoint
POSThttps://agents.withzero.xyz/api/v1/audio/transcripts/gpt-4o-transcribe?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need GPT-4o-quality speech-to-text transcription without managing your own OpenAI API key or billing, and when you are operating in an agent context that supports x402 autonomous micropayments. Especially suitable for agents needing pay-per-use transcription of WAV or MP3 audio up to 15 MB with no vendor account setup.
Side effects
- Audio exceeds 15 MB decoded size — request rejected
- Unsupported format provided (not wav or mp3) — validation error
- Invalid or malformed base64 string — decoding failure
- Audio quality too poor for accurate transcription — degraded or incomplete output
- Insufficient USDC balance or payment failure via x402 — payment error preventing execution
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. |
Tags
x402
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