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Button Labels — Invisible Character Flags
x402
Button Labels — 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 2026-10-17).
Detects invisible Unicode characters in button label text on a webpage or supplied HTML, flagged by element attribute matching.
Price / call$0.01
Success—
StatusUnknown
How this service works
Button labels — Invisible character flags: Invisible character flags for Button labels. 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 in the matched button label, along with details about the flagged characters and the button element identified by the specified attribute and value.
Example use cases
Audit checkout button for hidden chars
“Check the button with id 'checkout' on https://shop.example.com for any invisible or hidden Unicode characters in its label — search for the term 'checkout' and let me know if anything weird shows up.”
Validate CTA button from raw HTML
“I have some HTML for a landing page — can you scan the button with attribute 'data-kind' set to 'primary' for invisible Unicode characters? The term to look for is 'start' and here's the HTML: <!doctype html><html><body><button data-kind="primary">Start trial</button></body></html>”
Detect invisible chars after content update
“We just updated our button labels — can you check the button with id 'hero-cta' on https://mysite.com for any invisible Unicode characters in the text around the term 'get started', comparing against the previous text 'Get started free'?”
Technical details
Endpoint
POSThttps://market.datapackvibe.com/x402/assistant-bx-web-buttons-unicode?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to detect invisible or non-printable Unicode characters specifically within button label text on a static HTML page or supplied HTML snippet. It is ideal for content auditing, accessibility validation, or security checks where hidden Unicode glyphs in UI button text could cause display, SEO, or injection issues. Prefer this over general text scanners when you need to target specific button elements by HTML attribute.
Side effects
- URL is unreachable or returns non-200 status — no content to parse
- HTML exceeds 100,000 character limit — request rejected
- No button element matches the specified attribute/value pair — empty or null result
- Term not found in matched button label — no flags generated
- Invalid attribute name format — schema validation error
- JavaScript-rendered buttons not visible — static parser cannot detect them
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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