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Speech-to-Text Transcription via Whisper (Cloudflare Workers AI)
x402
Speech-to-Text Transcription via Whisper (Cloudflare Workers AI) is a paid API for AI agents from api.fadeandco.workers.dev, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-30).
Transcribes an audio file (public HTTPS URL or base64, up to 6 MB; WAV, MP3, M4A, OGG) to text using a Cloudflare Workers AI Whisper model, returning the transcript and optional timestamped segments.
Price / call$0.004
Success—
StatusUnknown
How this service works
Transcribes an audio file (a public https URL or base64, up to 6 MB; WAV, MP3, M4A or OGG as the model accepts them) to text with a Cloudflare Workers AI Whisper model, returning the text and any timestamped segments the model gives. Requires the env.AI binding.
Output
Returns the full transcribed text of the audio file along with any timestamped segment data provided by the Whisper model (e.g., start/end times and text per segment). Response quality depends on audio clarity and length (up to 6 MB).
Example use cases
Transcribe a podcast episode clip
“I have an MP3 podcast clip at https://media.example.com/episode42-clip.mp3 — can you transcribe it to text so I can pull quotes from it?”
Convert a voice memo to meeting notes
“Transcribe this voice memo I recorded after the meeting — it's at https://storage.example.com/voice-memo-2024.m4a — and give me the full text with any timestamped segments.”
Caption an audio interview for accessibility
“I need a text transcript with timestamps for this interview audio at https://cdn.example.com/interview.wav so I can add captions to the published version.”
Technical details
Endpoint
POSThttps://api.fadeandco.workers.dev/api/agent-intel/speech-to-text-transcribe-turbo?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need fast, affordable speech-to-text transcription from a public audio URL or base64-encoded audio in WAV, MP3, M4A, or OGG format (under 6 MB), and want optional timestamped segments. Ideal for agents automating transcription of voice memos, meeting recordings, podcast clips, or interview audio at $0.004 per call. Prefer alternatives if you need real-time streaming transcription, speaker diarization, or files larger than 6 MB.
Side effects
- Audio file exceeds 6 MB limit — request rejected
- Unsupported audio format (e.g., FLAC, AAC) — model may fail or return error
- Inaccessible or non-public audio URL — fetch failure
- Malformed base64 input — decoding error
- No speech detected in audio — empty or minimal transcript returned
- Network timeout fetching large audio files
- Whisper model binding unavailable — server-side configuration error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| audioUrl | string | Public https URL of the audio file (WAV, MP3, M4A or OGG), up to 6 MB |
| audioBase64 | string | Or the audio itself: base64 data (no data: prefix), up to 6 MB decoded |
Tags
x402
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