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SiteCheck API – Speech-to-Text Transcription
x402
SiteCheck API – Speech-to-Text Transcription is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).
Transcribes audio files (via URL or base64) into text with timestamps, language detection, and segment-level detail using Whisper Large v3 Turbo
Price / call$0.01
Success—
StatusUnknown
How this service works
Speech-to-text with Whisper large-v3-turbo: send an https audio URL (or base64) up to 25 MB, get the transcript, language and timestamped segments.
Output
Returns a JSON object with the full transcribed text, the Whisper model used, total audio duration in seconds, the detected or specified language code, and an array of timed segments each containing start time, end time, and the spoken text in that segment.
Example use cases
Podcast episode transcription
“Transcribe this podcast episode for me so I can turn it into a blog post — the audio is at https://feeds.example.com/episode42.mp3 and it's in English.”
Multilingual meeting notes
“I have a recorded team meeting in Spanish at https://storage.example.com/meeting-2024-06.wav — can you transcribe it and give me the timestamped segments so I know who said what and when?”
Voice memo to text
“Here's a base64-encoded voice memo I recorded on my phone — please convert it to text so I can copy it into my notes app.”
Technical details
Endpoint
POSThttps://api.sitecheck-api.workers.dev/api/transcribe?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call, keyless speech-to-text transcription with no signup overhead, especially when paying via USDC on Base via x402. It returns rich segment-level timestamps alongside full transcripts, making it ideal for captioning or meeting notes. Prefer it over managed STT services when you want crypto-native micropayments and no API key management.
Side effects
- Audio URL is inaccessible or returns a non-200 response — transcription fails
- Unsupported audio format provided — error or empty result
- Base64 audio is malformed or too large — request rejected
- Language code is invalid — may fall back to auto-detect or error
- Very long audio files may time out on the Cloudflare Workers runtime
- Payment not included or insufficient USDC — 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | https URL of an audio file (mp3, wav, m4a...) |
| language | string | Optional ISO code, e.g. en |
| audio_base64 | string | Alternative to url |
Output
Schema · Response
{
"type": "json",
"example": {
"text": "Hello and welcome...",
"model": "@cf/openai/whisper-large-v3-turbo",
"duration": 42.1,
"language": "en",
"segments": [
{
"end": 3.2,
"text": "Hello and welcome",
"start": 0
}
]
}
}Tags
x402
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