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H4 Attribute Values Extractor
x402
H4 Attribute Values Extractor is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-13).
Extracts distinct values of a specified HTML attribute from all H4 heading elements on a given web page or HTML snippet.
Price / call$0.01
Success—
StatusUnknown
How this service works
Level-four headings — Distinct attribute values: Distinct attribute values for Level-four headings. One public HTTPS page or supplied HTML; static parsing, no JavaScript rendering, login or access bypass. Specialised preset in a shared 50-profile, 20-operation engine. 0.01 USDC includes one bounded distinct attribute values result.
Output
Returns a bounded set of distinct values for the specified HTML attribute found across all H4 heading elements in the provided URL's page content or supplied HTML snippet, filtered by the given search term context.
Example use cases
Audit heading IDs on product docs
“Look at https://docs.example.com/products and pull out all the distinct 'id' attribute values used on H4 headings — I want to check they're all unique and properly named for the 'installation' section.”
Extract data attributes for content tagging
“From this HTML page at https://myblog.com/articles, give me all the distinct values of the 'data-category' attribute on H4 headings — I'm trying to see what categories are tagged there.”
Analyze custom attributes in pasted HTML
“I have some raw HTML here — can you extract all the unique 'class' attribute values from the H4 headings in it? The term I care about is 'guide'. Here's the HTML: <html><body><h4 class="guide-primary">Intro</h4><h4 class="guide-secondary">Setup</h4></body></html>”
Technical details
Endpoint
POSThttps://market.datapackvibe.com/x402/assistant-bx-web-h4-attribute-values?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to enumerate distinct HTML attribute values specifically from H4 heading elements on a static web page or known HTML fragment, particularly when you want a lightweight, cost-effective extraction (one bounded result per call at $0.01 USDC) without needing JavaScript rendering or authenticated page access.
Side effects
- URL is unreachable or returns non-200 status — no content to parse
- No H4 elements found in the document — empty result set
- Specified attribute does not appear on any H4 element — empty distinct values
- HTML exceeds 100,000 character limit — request rejected
- Attribute name fails regex validation (must start with letter, max 50 chars) — validation error
- JavaScript-rendered content not available since only static HTML is parsed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | |
| html | string | |
| term | string | |
| attribute | string | |
| previous_texts | array | |
| attribute_value | string |
Tags
x402
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