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AgentShelf CSS track[src] Extractor
x402
AgentShelf CSS track[src] Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).
Extracts text track source URLs (track[src] attributes) from HTML or a public web page URL, returning all values found in <track> elements.
Price / call$0.005
Success—
StatusUnknown
How this service works
Call when an agent needs text track sources via track[src] from a public page or HTML (SSRF-safe). Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/css-track-src first.
Output
Returns a list of all src attribute values found on <track> elements within the fetched or provided HTML, typically pointing to WebVTT or timed text files used for subtitles, captions, chapters, or audio descriptions.
Example use cases
Subtitle URL discovery for video
“I need to find all the subtitle and caption track file URLs from this video page at https://streaming-site.com/watch/movie-123 — can you extract the track src values from it?”
Accessibility audit for media content
“Check this HTML I'm pasting and pull out every track[src] attribute so I can verify which caption and audio description files are being referenced: <video><track src='/captions/en.vtt' kind='subtitles'><track src='/captions/ad.vtt' kind='descriptions'></video>”
Caption source inventory for media pipeline
“We're building a media catalog and need the text track source URLs from each of our video pages. Start with https://media.example.com/shows/pilot and extract all the track src values.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/css-track-src?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to extract text track (subtitle, caption, chapter, or description) source file URLs from a public web page or a known HTML fragment. It is SSRF-safe, making it suitable for agent pipelines where arbitrary URLs are processed. Prefer the unpaid sandbox at POST /v1/sandbox/css-track-src for testing. Choose this over a general HTML scraper when you specifically need track[src] values for media accessibility or subtitle pipeline work.
Side effects
- URL is unreachable or returns non-200 status — extraction fails with an error
- Provided HTML exceeds 200,000 character limit — request rejected
- URL blocked due to SSRF protection (private/internal IP ranges) — returns SSRF error
- No track elements found in the HTML — returns empty list
- Malformed HTML provided — parser may return incomplete or empty results
- URL string shorter than 8 characters or HTML shorter than 1 character — validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public page to fetch. The selector or profile is fixed by the SKU. Provide url or html. |
| html | string | HTML to extract from locally. Provide html or url. When both are set, html is used. |
Tags
x402
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