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Canonical URL Declarations — Empty Value Report
x402
Canonical URL Declarations — Empty Value Report is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-21).
Parses a webpage or HTML snippet to identify canonical URL link elements that have empty or missing href values
Price / call$0.01
Success—
StatusUnknown
How this service works
Canonical URL declarations — Empty value report: Empty value report for Canonical URL declarations. 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 empty value report result.
Output
Returns an empty value report identifying any canonical link elements in the provided URL or HTML where the href attribute is blank or absent, including element identifiers and relevant attribute details to help diagnose SEO or markup issues.
Example use cases
SEO audit for canonical tag issues
“Scan https://shop.mystore.com/collections/sale for any canonical link elements that have an empty href — I want to know if there are any blank canonical declarations causing SEO problems, specifically looking at elements with the class attribute set to 'seo-canonical'.”
Pre-launch HTML QA check
“Before we publish, check this HTML snippet for empty canonical URL declarations: <!doctype html><html><head><link rel="canonical" href="" id="page-canon"></head><body></body></html> — flag any canonical tags where the href is blank.”
CMS template canonical validation
“I'm auditing our CMS-generated pages — can you parse the HTML at https://blog.mysite.com/article/123 and report any canonical link elements that are missing or have empty href values, focusing on elements with the id attribute matching 'canonical-tag'?”
Technical details
Endpoint
POSThttps://market.datapackvibe.com/x402/assistant-bx-web-canonical-empty?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need lightweight, static HTML parsing to detect empty or missing canonical URL declarations on a single page — ideal for SEO audits, pre-publish QA checks, or CMS template validation where JavaScript rendering is not required and cost efficiency matters.
Side effects
- URL is inaccessible, behind a login, or returns a non-200 response
- HTML exceeds 100,000 character limit
- JavaScript-rendered canonical tags not captured (static parsing only)
- Malformed HTML may cause incomplete parsing
- Invalid attribute pattern (must start with a letter, alphanumeric/colon/underscore/hyphen only)
- No canonical elements found returns an empty result set
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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