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H4 Invisible Character Flags Extractor
x402
H4 Invisible Character Flags 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).
Parses HTML to detect and flag invisible Unicode characters within level-four heading (h4) elements, optionally filtered by a search term, attribute, or prior text context.
Price / call$0.01
Success—
StatusUnknown
How this service works
Level-four headings — Invisible character flags: Invisible character flags 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 invisible character flags result.
Output
Returns a bounded result indicating whether invisible Unicode characters were detected within matching h4 heading elements, along with flags identifying the nature and location of those characters relative to the searched term, attribute, and prior text context.
Example use cases
Audit docs page for hidden Unicode
“Scan https://docs.myproduct.com/reference for invisible characters hiding inside any h4 headings — look specifically for headings with the attribute 'data-kind' equal to 'api' and the term 'endpoint'.”
Validate pasted HTML for invisible glyphs
“I've got this HTML snippet — can you check whether any of the h4 headings contain invisible Unicode characters? The term I care about is 'setup' and the attribute to look at is 'class' with value 'guide-heading'.”
Content integrity check before publishing
“Before I publish this page, check the raw HTML I'm giving you for invisible or zero-width characters buried in the h4 headings, especially where the term 'overview' appears.”
Technical details
Endpoint
POSThttps://market.datapackvibe.com/x402/assistant-bx-web-h4-unicode?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to specifically audit level-four HTML headings for invisible Unicode characters — such as zero-width spaces, soft hyphens, or other hidden glyphs — using static HTML parsing without browser rendering. Prefer it over generic text scanners when the target is scoped to h4 elements with optional attribute or term filtering, and when you can supply a URL or raw HTML directly.
Side effects
- URL is unreachable or returns non-200 status — no content to parse
- HTML exceeds 100,000 character limit — input rejected
- No h4 headings found matching the specified term or attribute — empty result
- Invalid attribute name format — rejected by pattern validation
- URL requires JavaScript rendering or login — static parser returns incomplete content
- Previous texts array exceeds 200 items — input rejected
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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