# AgentShelf CSS Link Href Extractor

> AgentShelf CSS Link Href Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.009/call, status unknown (last checked 2026-10-02).

Extracts all href attributes from <link> elements in a public web page or provided HTML, with SSRF protection.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/css-link-href?utm_source=zero.xyz
- Price: $0.009/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-css-link-href-extractor-2d61569f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Hq1pl9hXlYoWkn81T9eN5

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-css-link-href-extractor-2d61569f -d '<json body>'
```

Example prompt: Can you grab all the link[href] values from https://example.com — I want to see every stylesheet and linked resource referenced in the page's <link> tags?

## When to prefer this

Use this endpoint when you specifically need href values from <link> elements (stylesheets, preloads, icons, canonical URLs) rather than anchor hrefs or other page content. Prefer the free sandbox POST /v1/sandbox/css-link-href first if available; pay this endpoint only when the sandbox is unavailable or rate-limited. Choose this over anchor href extractors when you need linked resources rather than navigation links.

## Known failure modes

- URL is private/internal (SSRF-blocked) — returns an error rejecting non-public addresses
- HTML string exceeds 200,000 character limit — request rejected
- URL string shorter than 8 characters or malformed — validation error
- Target page returns non-HTML content — may return empty list
- Page loads links dynamically via JavaScript — statically parsed hrefs only, dynamic links may be missed
- Payment of $0.009 USDC not provided — payment required error

## How this service works

Call when an agent needs link hrefs via link[href] from a public page or HTML (SSRF-safe). Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/css-link-href first.

## Output

A list of href attribute values from all <link> elements found in the fetched page or provided HTML, such as stylesheet URLs, preload hints, icon paths, and other linked resources.

## 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/agentshelf-css-link-href-extractor-2d61569f/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)