# AgentShelf XPath-Mark Extractor

> AgentShelf XPath-Mark Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.007/call, status unknown (last checked 2026-10-02).

Extracts text content from a public web page or raw HTML using XPath //mark selectors, with SSRF protection.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/xpath-mark?utm_source=zero.xyz
- Price: $0.007/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-xpath-mark-extractor-d464f5f5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_inMQeLTjvxD086YVcEX_8

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-xpath-mark-extractor-d464f5f5 -d '<json body>'
```

Example prompt: Can you extract all the highlighted (mark-tagged) text from this page: https://example.com/article — I need just the text inside the mark elements.

## When to prefer this

Use this endpoint when you need to extract specifically the content of HTML mark elements (highlighted/annotated text) from a public URL or raw HTML blob, and you want SSRF-safe fetching. Prefer the free sandbox endpoint /v1/sandbox/xpath-mark first for testing; switch to this paid endpoint ($0.007 USDC) for production or rate-limited scenarios.

## Known failure modes

- URL is not publicly accessible or returns non-200 status
- HTML input exceeds 200,000 character limit
- URL flagged as SSRF risk (private/internal addresses blocked)
- No mark elements found in the document (empty result)
- Malformed HTML that cannot be parsed
- URL string too short (under 8 characters) or too long (over 2048 characters)

## How this service works

Call when an agent needs text of //mark via //mark from a public page or HTML (SSRF-safe). Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/xpath-mark first.

## Output

Returns the text content extracted from //mark XPath-matched elements found within the provided URL's page or the supplied HTML string.

## 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 name=\"description\" content=\"Desc\"><meta property=\"og:title\" content=\"OG\">\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-xpath-mark-extractor-d464f5f5/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)