# AgentShelf Profile Rel-Alternate Extractor

> AgentShelf Profile Rel-Alternate Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-29).

Extracts all link[rel=alternate] href values from a public webpage or raw HTML, with SSRF protection.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/profile-rel-alternate?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-profile-rel-alternate-extractor-d017e210
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2LSnuJwZaNuekAC-YNEgJ

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-rel-alternate-extractor-d017e210 -d '<json body>'
```

Example prompt: Can you fetch https://www.bbc.com/news and extract all the link rel=alternate hrefs from that page for me?

## When to prefer this

Use this endpoint when you need to reliably extract rel=alternate hrefs from a public URL or raw HTML blob with SSRF safety guarantees. Prefer the free sandbox endpoint POST /v1/sandbox/profile-rel-alternate first; fall back to this paid endpoint ($0.003 USDC) when the sandbox is unavailable or rate-limited. Choose this over general HTML scrapers when you specifically need alternate link tag extraction with no side effects.

## Known failure modes

- URL is unreachable or returns non-200 status — extraction fails with an error
- SSRF protection blocks access to private/internal IP ranges or localhost URLs
- HTML input exceeds 200,000 character limit — request rejected
- No rel=alternate links found — returns empty list
- Malformed HTML may result in incomplete or missed link tags

## How this service works

Call when an agent needs link rel=alternate hrefs extracted from a public page or HTML (SSRF-safe). Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/profile-rel-alternate first.

## Output

A list of href values from all <link rel='alternate'> tags found in the fetched page or provided HTML, enabling downstream use such as feed subscription, hreflang analysis, or content syndication discovery.

## 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-rel-alternate-extractor-d017e210/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)