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glim.sh YouTube Transcript Fetcher
x402
glim.sh YouTube Transcript Fetcher is a paid API for AI agents from surf.cascade.fyi, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Fetches the subtitle/caption transcript (VTT format) for a YouTube video by video ID, optionally filtered by caption origin and language
Price / call$0.01
Success—
StatusUnknown
How this service works
Fetch a YouTube transcript from a video URL or 11-char id (video_id, also accepted as ref or url); returns a presigned download URL to the transcript
Output
A JSON object containing a presigned download URL to a VTT-format caption file, the video ID, language code, caption origin (uploader_provided or auto_generated), file size in bytes, character count, content type, and an expiry timestamp for the download URL.
Example use cases
Summarize video content for research
“I need you to fetch the transcript for this YouTube video ID kJQP7kiw9Dw so you can pull out the key points and give me a summary of what's covered.”
Analyze competitor product demos
“Can you get the auto-generated captions from the YouTube video at ID 9bZkp7q19f0 and tell me what features they're highlighting in their pitch?”
Extract quotes from educational videos
“Grab the transcript for YouTube video ID m7CgRYvE_5s and find any quotes about machine learning best practices that I can use in my presentation.”
Technical details
Endpoint
POSThttps://surf.cascade.fyi/api/v1/youtube/getWhen to prefer
Use this endpoint when you need the transcript or captions of a YouTube video without managing YouTube Data API keys or a scraping stack. Ideal for agents that need to read, summarize, or analyze video content. Prefer this over YouTube's official API when you want pay-per-call pricing with no OAuth setup, or when you need a simple presigned download URL for the VTT file.
Side effects
- Invalid or non-existent video ID returns an error — IDs must be exactly 11 characters
- Video has no captions in the requested language — returns empty or error response
- Unsupported language_code value causes no matching transcript to be found
- Presigned download_url expires after the expires_at timestamp — must be used promptly
- Payment failure (x402 protocol) if USDC balance is insufficient — call is not executed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| format | string | 'inline' (default): include the transcript in the response when it fits the inline cap; otherwise omit it and set transcript_omitted_reason. 'url': never include the transcript; caller fetches download_url. download_url is always present. |
| origin | string | 'uploader_provided' for human captions (default), 'auto_generated' for YouTube auto-captions. |
| video_id | string | YouTube video URL or 11-char video id (e.g. https://youtu.be/dQw4w9WgXcQ, https://www.youtube.com/watch?v=dQw4w9WgXcQ, or dQw4w9WgXcQ). Also accepted as `ref` or `url`. |
| language_code | string | ISO 639-1 language code (e.g. 'en', 'de', 'fr') |
Output
Schema · Response
{
"type": "json",
"example": {
"origin": "uploader_provided",
"video_id": "dQw4w9WgXcQ",
"expires_at": "2026-04-21T13:00:00Z",
"size_bytes": 4096,
"content_type": "text/vtt",
"download_url": "https://...presigned...",
"length_chars": 3500,
"language_code": "en"
}
}Tags
x402
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