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CSS Preload Href Extractor
x402
CSS Preload Href Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.007/call, status unknown (last checked 2026-10-02).
Extracts preload hrefs from link[rel='preload'] elements in a public webpage or raw HTML, returning the list of preloaded resource URLs.
Price / call$0.007
Success—
StatusUnknown
How this service works
Call when an agent needs preload hrefs via link[rel='preload'] from a public page or HTML (SSRF-safe). Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/css-preload first.
Output
A list of href values found in link[rel='preload'] elements from the given page or HTML. Each entry represents a resource URL that the page declares as a preload hint, such as fonts, scripts, stylesheets, or images.
Example use cases
Audit page resource preloading
“Go to https://shop.acme.com and pull out every link[rel='preload'] href so I can see what fonts, scripts, and stylesheets they're preloading.”
Analyze competitor preload strategy
“Extract all preload hints from https://www.competitor-site.com/homepage — I want to understand which critical assets they're telling the browser to preload first.”
Parse preloads from pasted HTML
“Here's the raw HTML from a page I saved locally — can you pull out all the link[rel='preload'] href values from it? <html>...<link rel='preload' href='/fonts/brand.woff2' as='font'>...</html>”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/css-preload?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to specifically extract link[rel='preload'] resource hints from a public webpage or HTML string, such as auditing what assets a page preloads, analyzing performance strategies, or building tooling around browser resource hints. Prefer the free /v1/sandbox/css-preload endpoint first if available. Choose this over general HTML scrapers when you specifically need structured preload href data rather than full page content.
Side effects
- URL is unreachable or returns non-200 status — extraction fails with error
- HTML exceeds 200,000 character limit — request rejected
- URL is flagged as SSRF-unsafe (private/internal IP range) — blocked
- No link[rel='preload'] elements found — returns empty list
- Malformed HTML prevents parsing — may return empty or partial results
- URL string shorter than 8 characters — 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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