# CSS Anchor Rel Token Extractor

> CSS Anchor Rel Token Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).

Extracts all anchor tag rel attribute values from a public URL or raw HTML string, with SSRF protection.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/css-a-rel?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/css-anchor-rel-token-extractor-164d8dd0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_O0Qqucknt1rGklazcGmrp

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 css-anchor-rel-token-extractor-164d8dd0 -d '<json body>'
```

Example prompt: Can you pull all the anchor rel tokens from https://example.com/page — I need to see what rel values are being used in the links on that page?

## When to prefer this

Use this endpoint when you need to programmatically extract anchor rel attribute tokens from a live webpage or raw HTML — especially for SEO auditing, link type classification, or structured link analysis. Prefer the unpaid sandbox endpoint POST /v1/sandbox/css-a-rel for testing. Choose this paid endpoint when you need reliable SSRF-safe fetching of public URLs in production agentic workflows.

## Known failure modes

- URL is unreachable or returns a non-200 response
- SSRF-blocked URL (internal/private IP ranges rejected)
- HTML exceeds 200,000 character limit
- URL string shorter than 8 or longer than 2048 characters
- No anchor elements with rel attributes found (empty result)
- Malformed HTML that cannot be parsed
- Payment not included or insufficient (x402 payment required)

## How this service works

Call when an agent needs anchor rel tokens via a[rel] from a public page or HTML (SSRF-safe). Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/css-a-rel first.

## Output

Returns a list or set of rel attribute token values found across all anchor (<a>) elements in the provided URL's page or raw HTML input, parsed in an SSRF-safe manner.

## 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/css-anchor-rel-token-extractor-164d8dd0/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)