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Combify Compute Speech-to-Text Transcription
x402
Combify Compute Speech-to-Text Transcription is a paid API for AI agents from compute.combify.app, paid per call via x402, $0.015/call, status unknown (last checked 2026-10-10).
Transcribes audio files (voice notes, meeting clips, podcasts) to text using Whisper large-v3-turbo for $0.015 USDC per call
Price / call$0.015
Success—
StatusUnknown
How this service works
Speech to text for voice notes, meeting clips, and podcasts: send audio, get a transcript (Whisper large-v3-turbo), fixed price $0.015 USDC. Use this when the input is audio; use /chat when the input is already text. POST JSON body {audio (required, base64, max 8 MB decoded), language (optional hint)}. Returns {text, duration_s}. Unpaid calls get 402; paid calls settle only on success.
Output
Returns a JSON object with 'text' (the full transcript as a string) and 'duration_s' (the length of the audio in seconds). Unpaid calls receive a 402 Payment Required response; successful payment settles only on successful transcription.
Example use cases
Meeting notes from recorded call
“I have a base64-encoded MP3 of a 45-minute team meeting in English — can you transcribe it so I can pull out the action items?”
Podcast episode transcript
“Transcribe this podcast clip for me — it's base64-encoded audio, spoken in Spanish, and I need the full text to publish as show notes.”
Voice note to searchable text
“I recorded a voice memo with some ideas earlier — can you convert this base64 audio to text so I can search through it and paste it into my notes app?”
Technical details
Endpoint
POSThttps://compute.combify.app/transcribe?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your input is audio (voice notes, meeting recordings, podcasts, interviews) and you need a text transcript. Use /chat instead if the input is already text. Priced at $0.015 USDC per call via x402, making it cost-effective for individual clips. Backed by Whisper large-v3-turbo for high accuracy across 100+ languages.
Side effects
- 402 Payment Required — call was made without valid x402 payment
- Audio exceeds 8 MB decoded size limit — request rejected
- Unsupported audio format or corrupted base64 encoding — transcription fails
- Ambiguous or incorrectly specified language hint leading to reduced accuracy
- Network timeout for large audio files near the size limit
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| audio | string | Base64-encoded audio, max 8 MB decoded |
| language | string | Optional language hint |
Tags
x402
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