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AgentShelf XPath H3 Extractor
x402
AgentShelf XPath H3 Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-29).
Extracts all h3 heading text from a public web page or raw HTML using XPath, with SSRF protection.
Price / call$0.01
Success—
StatusUnknown
How this service works
Call when an agent needs text of //h3 via //h3 from a public page or HTML (SSRF-safe). Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/xpath-h3 first.
Output
A list of text strings, one per h3 element found in the page or HTML, in document order. Returns an empty list if no h3 elements are present.
Example use cases
Extract article subsection headings
“Grab all the h3 headings from https://docs.python.org/3/library/functions.html so I can see what subsections are covered.”
Parse product category names from HTML
“Here's some HTML from an e-commerce page — can you extract all the h3 headings from it so I can see the product category names? <html>...</html>”
Audit competitor page structure
“Pull all the h3 headings from https://www.competitor.com/features so I can see how they organize their feature page.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/xpath-h3?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need h3-level headings only, rather than all heading levels (h1–h6). Prefer this over a general headings endpoint when you want a narrower, structured extraction of subheadings. Choose the paid /v1/xpath-h3 only after exhausting the free /v1/sandbox/xpath-h3 alternative. Best suited when you already have raw HTML or a public URL and need a lightweight, SSRF-safe extraction without running your own parser.
Side effects
- URL points to a private/internal IP range and is rejected (SSRF protection)
- URL is unreachable or returns a non-200 response
- HTML is malformed and no h3 elements can be parsed
- Input exceeds maxLength constraints (URL > 2048 chars or HTML > 200000 chars)
- Page requires JavaScript rendering and h3 elements are injected dynamically (not present in raw HTML)
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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