# agentshelf.syntexa.ch CSS Table Header Extractor

> agentshelf.syntexa.ch CSS Table Header Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-29).

Extracts all <th> (table header) text values from a public webpage URL or raw HTML string

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/css-th?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-syntexa-ch-css-table-header-extractor-feaf4fd8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Wg4sxLFwSFURxqK4POPpX

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-table-header-extractor-feaf4fd8 -d '<json body>'
```

Example prompt: Can you extract all the table header (th) cells from this page — https://example.com/data-table — and list the column names for me?

## When to prefer this

Use this endpoint when you need to quickly extract table header (th) text from a known public URL or a known HTML string without writing custom parsing logic. It is SSRF-safe, making it suitable for agent pipelines that must not expose internal network resources. It costs $0.005 USDC per call; consider the free POST /v1/sandbox/css-th endpoint first if available for testing or cost savings.

## Known failure modes

- URL is unreachable or returns non-200 status — extraction fails with an error
- Page has no <th> elements — returns empty result set
- HTML input exceeds 200,000 character limit — rejected with validation error
- URL string shorter than 8 characters or malformed — rejected
- SSRF-blocked private/internal IP ranges — request denied for security
- Dynamic JavaScript-rendered tables may not have th elements in the static HTML
- Payment of $0.005 USDC not provided — returns 402 Payment Required

## How this service works

Call when an agent needs table header text via th from a public page or HTML (SSRF-safe). Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/css-th first.

## Output

Returns the text content of all <th> elements found within the page or HTML input, allowing agents to understand table column structure without parsing full HTML manually. The response is SSRF-safe and covers all header cells present on the page.

## 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-table-header-extractor-feaf4fd8/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)