# AMP HTML Link Extractor

> AMP HTML Link Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-02).

Extracts AMP HTML href URLs from the link[rel='amphtml'] tag of a given public webpage or raw HTML string

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/css-link-amp?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/amp-html-link-extractor-de8e3eb5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5gcjrAj2m5KSRpBFYVANe

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 amp-html-link-extractor-de8e3eb5 -d '<json body>'
```

Example prompt: Can you extract the AMP HTML link from this page — https://www.example.com/article/breaking-news — I need the href from its link[rel='amphtml'] tag.

## When to prefer this

Use this endpoint when you need to programmatically discover the AMP (Accelerated Mobile Pages) URL of a public webpage, either by providing a URL to fetch and parse or by supplying raw HTML directly. Prefer the free sandbox version (/v1/sandbox/css-link-amp) first if available to avoid the $0.004 USDC charge. Choose this over general-purpose HTML scrapers when your specific need is just the AMP link, as it is SSRF-safe and purpose-built for this single extraction task.

## Known failure modes

- URL is not publicly accessible or returns a non-200 status — endpoint may return an error or empty result
- No link[rel='amphtml'] tag exists on the page — returns null or empty href
- SSRF-restricted URL (private IP ranges, localhost) — rejected for security reasons
- HTML input exceeds 200,000 character limit — request rejected
- URL shorter than 8 characters — validation error
- Malformed HTML that cannot be parsed — may return empty result

## How this service works

Call when an agent needs AMP HTML hrefs via link[rel='amphtml'] from a public page or HTML (SSRF-safe). Exact $0.004 USDC. Prefer unpaid POST /v1/sandbox/css-link-amp first.

## Output

Returns the href URL found in the page's link[rel='amphtml'] tag — the canonical AMP version of the given page. If no AMP link is present, returns null or an empty result. May include a status indicator of whether the AMP link was found.

## 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 charset=\"utf-8\"><meta name=\"description\" content=\"Desc\">\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/amp-html-link-extractor-de8e3eb5/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)