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AgentShelf HTML Lang Attribute Extractor
x402
AgentShelf HTML Lang Attribute Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-01).
Extracts the `lang` attribute value from the `<html>` element of a given public webpage URL or raw HTML string, in an SSRF-safe manner.
Price / call$0.002
Success—
StatusUnknown
How this service works
Call when an agent needs the html lang attribute extracted from a public page or HTML (SSRF-safe). Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/profile-html-lang first.
Output
Returns the value of the `lang` attribute found on the root `<html>` element of the fetched or provided HTML document (e.g. 'en', 'fr', 'zh-CN'). If the attribute is absent or the page cannot be fetched, returns an empty or error response.
Example use cases
SEO language audit for website
“Check https://www.acmecorp.com and tell me what language code is set in the html lang attribute — I need to confirm it's set correctly for our international SEO audit.”
Accessibility compliance check
“I have this raw HTML snippet and need to know what the html lang attribute is set to — can you pull that out so I can verify it meets WCAG accessibility requirements?”
Bulk language tag verification
“Can you check the html lang attribute on https://blog.widgets.io — we need to confirm all our regional pages are declaring the right language codes before launch.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/profile-html-lang?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically determine the declared language of a webpage or HTML fragment via the `<html lang>` attribute, particularly for SEO audits, accessibility checks, or internationalization validation. Prefer the free sandbox variant (/v1/sandbox/profile-html-lang) for testing. Use this paid endpoint when the sandbox is unavailable or when making production calls. Choose sibling endpoints if you need other HTML metadata such as og:title, canonical links, or anchor hrefs.
Side effects
- URL is unreachable or returns a non-200 HTTP status
- SSRF guard blocks private/internal IP addresses or metadata endpoints
- HTML has no lang attribute on the html element — returns empty result
- HTML string exceeds 200,000 character limit
- Neither url nor html provided — schema validation error
- Malformed or non-HTML content at the given URL
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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