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Delx Audio Transcription
x402
Delx Audio Transcription is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Transcribes a single WAV audio clip (up to 60 seconds, 2 MiB) to text for $0.02 USDC per call, returning the transcript and a SHA-256 receipt with no API key or audio retention.
Price / call$0.02
Success—
StatusUnknown
How this service works
Delx is an independent AI agent lab building and studying continuity, recovery, verifiable work and governed exchange for autonomous systems.
Output
Returns the full text transcript of the spoken audio, along with a SHA-256 hash receipt that serves as a verifiable record of the transcription. No audio is retained after processing.
Example use cases
Voice note to text for field agents
“I recorded a 45-second voice note on my phone after the meeting — here's the base64 WAV — can you transcribe it so I can paste it into my notes?”
Support call snippet transcription
“I have a 55-second WAV clip of a customer support call encoded in base64. Can you get me a transcript of it, including a receipt I can attach to the case?”
Meeting action items extraction
“Transcribe this 30-second WAV snippet from our standup — it's base64 encoded — so I can pull out the action items mentioned.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/transcribe-audioWhen to prefer
Choose this endpoint when you need a quick, pay-per-use transcription of a short WAV clip (under 60 seconds) without setting up an API key or subscription. It is ideal for one-off voice notes, support call snippets, or meeting excerpts where you need a verifiable SHA-256 receipt and audio privacy (no retained audio). Prefer alternatives for longer audio, non-WAV formats, bulk batch transcription, or when you need speaker diarization or timestamps.
Side effects
- Audio exceeds 2 MiB decoded size — request rejected
- Audio clip longer than 60 seconds — request rejected
- Invalid or malformed base64 encoding — decoding error returned
- Non-WAV audio format submitted — format rejection error
- Payment of $0.02 USDC not completed — 402 Payment Required response
- URL or file path submitted instead of base64 data — rejected per schema
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| audio_base64 | string | One base64-encoded WAV up to 2 MiB decoded and 60 seconds. audio/wav data-URI prefixes are accepted. URLs, file paths, and model/version fields are rejected. |
Output
Schema · Response
{
"type": "json",
"example": {
"text": "hello agents",
"bytes": 12,
"model": "vaibhavs10/incredibly-fast-whisper",
"sha256": "2d6c7c2b3f3c8e1e7b0d3a5b6e7f8a9b1234567890abcdef1234567890abcdef",
"provider": "replicate",
"text_url": "https://api.delx.ai/api/v1/generated-transcripts/9c2e1b84f0a14d2e9c8b7a6543210fed.txt",
"media_type": "text/plain",
"input_sha256": "34a8815e9c57e321194d50f2ea8b64394019fb8038c9aefd7a9a306a5030fc31",
"generation_id": "9c2e1b84f0a14d2e9c8b7a6543210fed",
"sale_price_usdc": 0.02,
"gross_margin_usd": 0.0164,
"upstream_cost_usd": 0.0036,
"provider_prediction_id": "tr-example-prediction"
}
}Tags
x402
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