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AgentShelf Profile Canonical Link Extractor
x402
AgentShelf Profile Canonical Link Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Extracts the canonical link href from a public webpage by URL or raw HTML, with SSRF protection
Price / call$0.001
Success—
StatusUnknown
How this service works
Call when an agent needs the canonical link href extracted from a public page or HTML (SSRF-safe). Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/profile-canonical first.
Output
Returns the extracted canonical link href string found in the <link rel='canonical' href='...'> tag of the provided page or HTML. If no canonical tag is present, returns an appropriate null or empty response.
Example use cases
SEO canonical URL audit
“I have a list of blog posts and I need to check what canonical URL each one declares — can you start with https://myblog.com/2024/post-title and pull the canonical link href from that page?”
Deduplication before crawl indexing
“Before I index this page, I need to know if it declares a different canonical URL — can you extract the canonical link href from the HTML I'm giving you? Here's the full HTML: <!DOCTYPE html><html><head><link rel="canonical" href="https://example.com/official-page"/></head><body></body></html>”
Detect canonical mismatch for content syndication
“I syndicated an article to https://partner-site.com/articles/some-article — can you fetch that URL and tell me what canonical link it points to, so I can confirm it's pointing back to my original?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/profile-canonical?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to reliably extract the declared canonical URL from a public webpage or known HTML content in a paid, SSRF-safe manner. Prefer the free sandbox endpoint POST /v1/sandbox/profile-canonical for testing or unpaid use. Choose this over general HTML scrapers when you specifically need only the canonical link href without any broader extraction overhead.
Side effects
- URL is unreachable or returns non-200 status — fetch fails with an error
- No canonical link tag present in the page — returns empty or null canonical
- SSRF-blocked URL (private IP ranges, internal hostnames) — rejected for security reasons
- HTML too large (exceeds 200,000 character limit) — input validation error
- URL too short (below 8 characters) — rejected by input schema
- Malformed HTML where canonical tag cannot be parsed — may return empty result
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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