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WebLens YouTube Transcript Extraction
x402
WebLens YouTube Transcript Extraction is a paid API for AI agents from api.weblens.dev, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-02).
Extracts the full text transcript and timestamped segments from a YouTube video given its video ID
Price / call$0.03
Success—
StatusUnknown
How this service works
# WebLens - Web Intelligence API, pay per call Scrape, crawl, map and extract the web. No account, no API key, no monthly minimum — you pay for the calls you make and nothing else. ## Pricing Page fetching starts at **$0.002**, whole-site crawling at **$0.0015/page**, and sitemap discovery at **$0.004**. Comparable services bill $0.007-0.008 per request, or reach a lower per-page rate only on a $99/month commitment. WebLens has no commitment to reach. ## Payment Protocol All paid endpoints use the [x402 protocol](https://x402.org) for HTTP-native micropayments (USDC on Base). ## Cache Discount Cached responses are **70% cheaper** than fresh fetches.
Output
Returns a JSON object containing the YouTube video ID, the full concatenated transcript text, an array of timestamped segment objects (each with the segment text, start time in milliseconds, and a human-readable start time string), a timestamp of when the data was fetched, and a unique request ID.
Example use cases
Summarize a long YouTube lecture
“Grab the transcript of the YouTube video dQw4w9WgXcQ and then summarize the key points for me — I want to know what the speaker covered without watching the whole thing.”
Quote-check a YouTube interview
“Can you get the full timestamped transcript of the YouTube video with ID abc123XYZ so I can find the exact moment where the interviewee talks about climate change and pull the direct quote?”
Build searchable notes from a tutorial
“Fetch the transcript of YouTube video ID xyz789tutorial with timestamps — I want to create a searchable outline of the tutorial so I can jump to specific steps.”
Technical details
Endpoint
POSThttps://api.weblens.dev/social/youtube/transcript?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need structured, timestamped transcript data from a YouTube video programmatically — especially when you need segment-level timing for quote extraction, summarization, or searchable note generation. Prefer this over general web scraping endpoints because it is purpose-built for YouTube transcripts and returns a clean, segmented data structure rather than raw HTML. The 70% cache discount makes it cost-effective for popular videos that may already be cached.
Side effects
- Video has no captions or auto-generated subtitles available — returns error indicating transcript unavailable
- Invalid or non-existent video ID — returns error with video not found message
- Video is age-restricted or private — returns access denied or extraction failure error
- YouTube blocking or rate limiting the scrape — returns fetch failure or retry-later error
- Network timeout when fetching long videos with large transcripts
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| lang | string | Transcript language code (optional) |
| videoId | string | YouTube video ID or full video URL |
Output
Schema · Response
{
"type": "json",
"example": {
"videoId": "dQw4w9WgXcQ",
"fullText": "We're no strangers to love...",
"segments": [
{
"text": "We're no strangers to love",
"startMs": 0,
"startTime": "0:00"
}
],
"fetchedAt": "2026-07-25T12:00:00.000Z",
"requestId": "req_yt123"
}
}Tags
x402
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