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x402Factory.ai Speech-to-Text (Base/USDC)
x402
x402Factory.ai Speech-to-Text (Base/USDC) is a paid API for AI agents from x402factory.ai, paid per call via x402, $0.6/call, status unknown (last checked 2026-09-14).
Transcribes audio from a YouTube video or direct audio file URL into text, charging 0.01 USDC per minute via x402 micropayment on Base.
Price / call$0.6
Success—
StatusUnknown
How this service works
Base speech-to-text endpoint using x402 payments. Provide either a YouTube URL/ID or a direct audio file URL; the server downloads the audio, runs speech-to-text, and returns the transcript text. Pricing: 0.01 USDC per started minute of audio, computed from the estimated duration and charged upfront via x402. Default discovery price without a specific URL is 0.60 USDC as an upper-bound quote. When called without a specific URL, the endpoint returns a default discovery quote. Clients should re-run discovery with a concrete URL to get an exact quote based on the real audio duration.
Output
Returns a JSON object with ok=true on success, the full transcript as a plain text string in the 'text' field, the source type used ('youtube' or 'file_url'), the resolved URL or video ID processed, the audio duration in seconds and rounded-up minutes, and the exact USDC price charged for the call.
Example use cases
Example prompt
“Can you transcribe this YouTube video for me? Here's the URL: https://www.youtube.com/watch?v=dQw4w9WgXcQ — I need the full spoken transcript.”
Technical details
Endpoint
POSThttps://x402factory.ai/base/sttWhen to prefer
Use this endpoint when you need to transcribe audio from a YouTube video or a direct audio file URL and want per-minute micropayment pricing (0.01 USDC/minute) via x402 on Base rather than a traditional API key subscription. Ideal for pay-as-you-go transcription of varying-length content without upfront commitment.
Side effects
- Invalid or inaccessible YouTube URL/ID returns an error with ok=false
- Audio file URL is unreachable or not a supported format
- Payment insufficient for the actual audio duration — discovery quote may underestimate for long content
- Called without a URL returns a discovery quote (0.60 USDC upper bound) rather than a real transcript
- Network timeout downloading large audio files
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| youtube | string | YouTube video URL (e.g. https://www.youtube.com/watch?v=...) or 11-character video ID. For paid calls, either youtube or file_url is required. |
| file_url | string | Direct URL to an audio file (e.g. .mp3, .webm). Must be an http(s) URL. For paid calls, either youtube or file_url is required. |
Output
Schema · Response
{
"ok": {
"type": "boolean",
"description": "True on success."
},
"text": {
"type": "string",
"description": "Full transcript text returned by the speech-to-text engine (top-level 'text' field)."
},
"action": {
"type": "string",
"description": "Action performed. For this endpoint: 'stt'."
},
"source": {
"type": "string",
"description": "Source type used for transcription: 'youtube' or 'file_url'."
},
"file_url": {
"type": "string",
"description": "Direct file URL that was processed when source = 'file_url'."
},
"video_id": {
"type": "string",
"description": "YouTube video ID that was processed."
},
"price_usdc": {
"type": "number",
"description": "Price charged for this call in USDC (6 decimals). Computed as 0.01 USDC per started minute of audio."
},
"youtube_url": {
"type": "string",
"description": "Resolved YouTube URL that was processed."
},
"duration_minutes": {
"type": "number",
"description": "Duration rounded up to whole minutes, used for pricing (0.01 USDC per minute)."
},
"duration_seconds": {
"type": "number",
"description": "Audio duration in seconds when available (YouTube metadata or estimated from file size)."
}
}Tags
x402
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