# agentshelf.syntexa.ch CSS Label Extractor

> agentshelf.syntexa.ch CSS Label Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-02).

Extracts label text from a public web page or raw HTML using CSS selectors, returning the matched element's text content.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/css-label?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-syntexa-ch-css-label-extractor-1ea0a046
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MkFEfDMeDJ9k86VfS9W6j

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-css-label-extractor-1ea0a046 -d '<json body>'
```

Example prompt: Can you grab the text of the first label element with class 'product-title' from this HTML I'm pasting in? Here's the markup: <div class='product-title'>Blue Widget Pro</div>

## When to prefer this

Use this endpoint when an agent needs to extract the visible text content of a specific element identified by a CSS selector from either a live public URL or raw HTML string, and SSRF safety is required. Prefer the free sandbox variant (POST /v1/sandbox/css-label) for testing. Choose this paid endpoint for production workloads or when the sandbox is unavailable.

## Known failure modes

- CSS selector not found in the provided HTML or fetched page returns empty result
- URL is blocked, requires authentication, or returns a non-200 status
- HTML input exceeds 200,000 character limit
- URL is shorter than 8 characters or malformed
- SSRF-restricted URL (private/internal IP ranges) is rejected
- Neither url nor html parameter is provided

## How this service works

Call when an agent needs label text via label from a public page or HTML (SSRF-safe). Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/css-label first.

## Output

Returns the matched text content of the CSS-selected label element from the provided URL or HTML string. Typically a short string representing the visible label copy found in the DOM.

## 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-syntexa-ch-css-label-extractor-1ea0a046/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)