# AgentShelf Profile Canonical Link Extractor

> 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

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/profile-canonical?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-profile-canonical-link-extractor-7d348810
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_asX6S_YEjVyDb7XiSWRuB

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability agentshelf-profile-canonical-link-extractor-7d348810 -d '<json body>'
```

Example prompt: Can you extract the canonical link href from this page — https://example.com/blog/my-post — so I know what URL it officially declares as its canonical version?

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "maxLength": 2048,
   "minLength": 8,
   "description": "Public page to fetch. The selector or profile is fixed by the SKU. Provide url or html."
  },
  "html": {
   "type": "string",
   "examples": [
    "<!doctype html><html lang=\"en\"><head><title>Hello</title>\n<meta name=\"description\" content=\"Desc\"><meta property=\"og:title\" content=\"OG\">\n<link rel=\"canonical\" href=\"https://example.com/\"><link rel=\"icon\" href=\"/favicon.ico\">\n</head><body><h1>Hello</h1><a href=\"https://example.com/a\">A</a></body></html>"
   ],
   "maxLength": 200000,
   "minLength": 1,
   "description": "HTML to extract from locally. Provide html or url. When both are set, html is used."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentshelf-profile-canonical-link-extractor-7d348810/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)