# AgentShelf CSS External Link Extractor

> AgentShelf CSS External Link Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).

Extracts blank-target anchor hrefs (a[target='_blank']) from a public webpage URL or raw HTML, with SSRF protection.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/css-external?utm_source=zero.xyz
- Price: $0.002/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-external-link-extractor-2457131a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_js9tWy1sDJJZRfEqrSA68

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-external-link-extractor-2457131a -d '<json body>'
```

Example prompt: Can you extract all the blank-target external links from https://example.com/resources — I need every href from anchor tags with target='_blank' on that page.

## When to prefer this

Use this endpoint when you need to specifically extract external links that open in new tabs (a[target='_blank']) from a public URL or raw HTML. It is SSRF-safe, making it suitable for agent pipelines that process user-supplied URLs. Prefer the unpaid POST /v1/sandbox/css-external endpoint first if available; fall back to this paid endpoint when sandbox is unavailable or rate-limited.

## Known failure modes

- URL is unreachable or returns non-200 status — endpoint may return an error or empty result
- URL points to a private/internal network address — blocked by SSRF protection
- HTML input exceeds 200,000 character limit — request rejected
- No blank-target anchors found on the page — returns empty list
- Malformed HTML may cause incomplete or unexpected parsing results

## How this service works

Call when an agent needs blank-target anchor hrefs via a[target='_blank'] from a public page or HTML (SSRF-safe). Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/css-external first.

## Output

Returns a list of href attribute values from all anchor elements with target='_blank' found in the provided URL's page or raw HTML content. Results are SSRF-safe, meaning server-side request forgery attack vectors are mitigated.

## 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-external-link-extractor-2457131a/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)