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Footer Blocks — Invisible Character Flags
x402
Footer Blocks — Invisible Character Flags is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-16).
Detects and flags invisible/hidden Unicode characters present in the footer blocks of a webpage or supplied HTML snippet.
Price / call$0.01
Success—
StatusUnknown
How this service works
Footer blocks — Invisible character flags: Invisible character flags for Footer blocks. 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 which, if any, invisible or hidden Unicode characters (such as zero-width spaces, zero-width non-joiners, soft hyphens, or other non-printable codepoints) are present in the detected footer blocks of the provided URL or HTML. The result is scoped to a specific HTML element identified by attribute and value, and contextualized against a search term and optional previous texts.
Example use cases
Footer watermark detection audit
“Scan the footer of https://mybrand.com for any invisible Unicode characters or hidden watermarks — look at the element with attribute id set to 'site-footer' and flag anything related to the term 'copyright'.”
Phishing site footer inspection
“I have some raw HTML from a suspicious page — can you check its footer block with data-kind attribute set to 'nav' for any invisible or zero-width characters that might be hiding something? Search around the term 'login'.”
Competitive site footer comparison
“Compare the footer of https://competitor.com against my previous texts ['Original footer text'] — look at the element with id 'footer' for any invisible character flags related to the term 'terms'.”
Technical details
Endpoint
POSThttps://market.datapackvibe.com/x402/assistant-bx-web-footers-unicode?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need lightweight, static HTML parsing specifically targeting footer blocks for invisible Unicode character detection, without JavaScript rendering. It is ideal for security audits, watermark detection, content integrity checks, or phishing analysis where footer anomalies are suspected. Prefer this over general-purpose web scrapers when the task is narrowly scoped to footer element Unicode analysis and cost efficiency ($0.01 USDC per call) is a priority.
Side effects
- URL is unreachable or returns a non-200 HTTP status — parse fails
- Footer element matching the given attribute/value pair not found in the page — empty or null result
- Page requires JavaScript rendering to display footer — static parser returns no footer content
- HTML payload exceeds 100,000 character limit — request rejected
- Attribute value pattern does not match schema regex — validation error
- Rate limiting or payment failure for x402 micropayment — request blocked
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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