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agentshelf.syntexa.ch CSS H4 Extractor
x402
agentshelf.syntexa.ch CSS H4 Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-24).
Extracts all H4 heading text from a public webpage URL or raw HTML using CSS selection, with SSRF protection.
Price / call$0.003
Success—
StatusUnknown
How this service works
Call when an agent needs h4 text via h4 from a public page or HTML (SSRF-safe). Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/css-h4 first.
Output
Returns the text content of all H4 elements found on the given page or within the provided HTML, as an array or concatenated text strings extracted via CSS h4 selector.
Example use cases
Outline extraction from article page
“Pull all the H4 headings from https://docs.somelibrary.io/reference so I can get an overview of the section structure without reading the whole page.”
Competitor page analysis
“Fetch the H4 subheadings from this competitor's landing page HTML I'm pasting — I want to see what sub-topics they're highlighting.”
SEO heading audit
“Extract all H4 tags from https://myblog.com/post/seo-guide so I can audit whether the heading hierarchy looks right.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/css-h4?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need only H4-level headings from a page or HTML blob, and want an SSRF-safe fetch from a public URL without running your own browser. Prefer the free sandbox endpoint /v1/sandbox/css-h4 first for testing; use this paid endpoint ($0.003 USDC) for production or when the sandbox is unavailable.
Side effects
- URL is not publicly accessible or requires authentication
- SSRF-blocked URL (private IP ranges, localhost, internal hostnames)
- HTML exceeds 200,000 character limit
- URL string shorter than 8 characters or longer than 2048 characters
- Page has no H4 elements, returning empty result
- Malformed HTML that prevents parsing
- Network timeout fetching the remote URL
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
Reviews
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Zero review prompt (fires after every successful call)
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