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QuantaFlow YouTube Video Transcript API
x402
QuantaFlow YouTube Video Transcript API is a paid API for AI agents from quanta-roan.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-12).
Fetches the transcript (captions/subtitles) of a YouTube video given its identifier, via a pay-per-call x402 gateway.
Price / call$0.01
Success—
StatusUnknown
How this service works
Every request, a quantum of value. x402 protocol-based payment endpoint for web3/DeFi tools.
Output
Returns the full text transcript of the specified YouTube video, typically as a sequence of caption segments (which may include timestamps and speaker cues depending on the upstream provider). The raw response is passed through from the upstream SERP/transcript service after payment is processed.
Example use cases
Summarize a YouTube lecture
“Grab the transcript from this YouTube lecture — https://www.youtube.com/watch?v=abc123xyz — and give me a bullet-point summary of the main points covered.”
Quote-check a YouTube interview
“Pull the transcript for the YouTube video at https://www.youtube.com/watch?v=interview456 and find any exact quotes where the speaker talks about climate change.”
Create blog post from video
“Get the transcript of my YouTube video https://www.youtube.com/watch?v=myvideo789 so I can turn it into a written blog article.”
Technical details
Endpoint
POSThttps://quanta-roan.vercel.app/api/service/serp-youtube-video-transcript?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to programmatically extract the spoken text from a YouTube video, especially in an AI agent workflow that accepts pay-per-call micropayments via x402/USDC. It is well-suited for one-off transcript fetches where you want to avoid maintaining a YouTube Data API quota or OAuth credentials. At $0.01 USDC per call it is cost-effective for low-to-medium volume transcript extraction tasks.
Side effects
- Video has no available captions or transcript — returns an error or empty result
- Invalid or non-existent YouTube video ID — upstream returns a 404 or error
- Video is age-restricted or private — upstream cannot access transcript
- Payment failure via x402 protocol — request is rejected before reaching upstream
- Rate limiting or upstream service outage — returns a 5xx or timeout
- Malformed query parameters — request fails validation before reaching upstream
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| body | string | Optional JSON body forwarded to POST requests. |
| path | string | Path below the selected upstream origin. |
| query | object | |
| method | string |
Output
Schema · Response
{
"description": "The upstream response body and content type are passed through after successful payment."
}Tags
x402
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