# agentshelf.syntexa.ch AMP HTML Link Extractor

> agentshelf.syntexa.ch AMP HTML Link Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.009/call, status unknown (last checked 2026-09-29).

Extracts link rel=amphtml href values from a given public URL or raw HTML document, returning the AMP version URLs found on the page.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/profile-rel-amphtml?utm_source=zero.xyz
- Price: $0.009/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-syntexa-ch-amp-html-link-extractor-c4430545
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EkCYkbuwDRpMqZQBIKoO-

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-syntexa-ch-amp-html-link-extractor-c4430545 -d '<json body>'
```

Example prompt: Can you extract the AMP version URL from this page — https://www.example-news.com/article/breaking-story — by pulling the link rel=amphtml href from it?

## When to prefer this

Use this endpoint when you need to programmatically discover the AMP alternate URL for a given public webpage, either by providing a URL to fetch or raw HTML to parse. It is SSRF-safe for agent use. If a free sandbox version (POST /v1/sandbox/profile-rel-amphtml) is available, prefer that first to avoid the $0.009 USDC charge.

## Known failure modes

- URL is unreachable or returns non-200 status — extraction fails with error
- Page has no link rel=amphtml elements — returns empty result
- HTML input exceeds 200,000 character limit — rejected with validation error
- URL is blocked due to SSRF protection (private/internal IPs) — rejected
- Malformed HTML prevents parsing — may return empty or partial result
- URL string shorter than 8 characters — rejected by schema validation

## How this service works

Call when an agent needs link rel=amphtml hrefs extracted from a public page or HTML (SSRF-safe). Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/profile-rel-amphtml first.

## Output

Returns the extracted href values from all link rel=amphtml elements found in the page or HTML, typically one or more AMP page URLs. If no amphtml link is present, returns an empty result or null.

## 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-syntexa-ch-amp-html-link-extractor-c4430545/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)