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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, status unknown (last checked 2026-09-15).
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
Create media, research companies and people, publish to the web, remember context, deploy apps, and schedule work—on demand, without vendor accounts or API keys. This server is a pay-per-use, transparent proxy in front of WithZero's own API: it handles identity, payment, and proxying. Agents can purchase autonomously or with their human's approval. This document is the source of truth for agents: it lists the complete verified paid surface with each operation's live price in its x-payment-info. Endpoints not listed here are not part of the supported catalog. The live catalog at /manifest.json is authoritative for prices and any free included units (prices[].includedUnits) - some meters include free usage per account before any charge.
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-transcribeWhen 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 |
|---|---|---|
| audio | string | Base64-encoded audio to transcribe (decoded size up to 15 MB). |
| format | string | Container format of the audio. |
Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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