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Delx Commerce — HTML Canonical Link Check
x402
Delx Commerce — HTML Canonical Link Check is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Verifies whether a document URL and its declared canonical URL match, returning a pass/fail result with evidence of the check.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
Returns a JSON object with the two compared URLs (left: document URL, right: canonical URL), a boolean 'matched' flag, an overall status of 'pass' or 'fail', an operation identifier, and an evidence block containing whether input was retained (always false), the SHA256 hash of the input, and the count of external calls made (always 0), confirming fully in-memory processing.
Example use cases
SEO canonical audit before publish
“Before I publish this page, check if the canonical URL https://shop.example.com/products/widget matches the document URL https://shop.example.com/products/widget — I want to make sure there's no canonical mismatch that would hurt SEO.”
Detecting duplicate content canonical issues
“I think one of my blog pages might have the wrong canonical set. Can you verify whether the document URL https://blog.example.com/post-123 and its declared canonical https://blog.example.com/post-123-original are actually matching?”
Automated web reliability monitoring
“As part of my site health check, verify that the canonical link on https://news.example.com/article/456 matches the document URL https://news.example.com/article/456 and return a pass or fail result.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/html-canonical-link-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, verifiable, pay-per-call check of whether a page's declared canonical URL matches its document URL, without signup or subscription. It is ideal for agents running automated SEO audits, web reliability pipelines, or one-off canonical tag validations where privacy matters (no data retention, in-memory only) and cost predictability ($0.001 USDC per call) is important.
Side effects
- Missing or malformed document_url or canonical_url fields returns a validation error
- URLs exceeding 8192 characters are rejected
- Network or parsing issues with the provided URLs may result in an error response
- Payment failure via x402 prevents the call from executing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| document_url | string | Document URL supplied to Html Canonical Link Check; used only for this bounded calculation and processed in memory without retention. |
| canonical_url | string | Canonical URL supplied to Html Canonical Link Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"left": "https://example.com/page",
"right": "https://example.com/page",
"matched": true
},
"schema": "delx/util-html-canonical-link-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "592c02dfd1b6df477a94ca4c931b3a3f08c24e00f6ccaf91931c0bf89268d170",
"external_calls": 0
},
"operation": "web_reliability:html_canonical_link_check"
}
}Tags
x402
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