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AgentShelf XPath H4 Extractor
x402
AgentShelf XPath H4 Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).
Extracts all H4 heading text from a public web page or raw HTML using XPath, with SSRF protection.
Price / call$0.001
Success—
StatusUnknown
How this service works
Call when an agent needs text of //h4 via //h4 from a public page or HTML (SSRF-safe). Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/xpath-h4 first.
Output
A list of text strings, each being the text content of an H4 element found in the page or HTML, in document order. Returns an empty list if no H4 elements are present.
Example use cases
Documentation section discovery
“Pull out all the H4 headings from https://docs.stripe.com/api so I can see what subsections are covered in their API reference.”
Competitive content audit
“I've got the HTML of a competitor's product page — can you extract all the H4 headings from it so I can see how they structure their feature descriptions?”
Article outline extraction
“Grab all the H4 headings from https://en.wikipedia.org/wiki/Machine_learning so I can get a quick outline of the article's subsections.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/xpath-h4?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need only H4-level headings from a page or HTML snippet. Prefer this over the broader h1–h6 extractor when you want targeted fourth-level headings only. Use the sandbox (unpaid) variant first to test. Choose this over general content-to-markdown endpoints when you need structured heading data rather than full page text.
Side effects
- URL is private/internal (SSRF rejection) — returns error indicating blocked address
- URL is unreachable or returns non-200 status — fetch error returned
- HTML input exceeds 200,000 character limit — validation error
- Neither url nor html provided — missing input error
- Malformed URL format — validation error
- Page has no H4 elements — returns empty result list
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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