# XPath Form Action Extractor

> XPath Form Action Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-29).

Extracts the action attribute (URL) from HTML form elements using XPath //form/@action, given a public page URL or raw HTML.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/xpath-form-action?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/xpath-form-action-extractor-f66cfd13
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W0fR-EySmwC8mKDXOspmw

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 xpath-form-action-extractor-f66cfd13 -d '<json body>'
```

Example prompt: Can you extract the form action URL from the login page at https://example.com/login? I need to know where that form submits to.

## When to prefer this

Use this endpoint when you need to programmatically discover where an HTML form submits (its action URL) from either a live public URL or a raw HTML string. Prefer the free sandbox variant (/v1/sandbox/xpath-form-action) for testing or unpaid usage. Choose this paid endpoint for production workloads requiring reliable SSRF-safe extraction at $0.006 USDC per call.

## Known failure modes

- URL is not publicly accessible or returns non-200 status — SSRF-safe filter rejects private/internal addresses
- HTML contains no form element — returns empty or null result
- Form has no action attribute — result may be empty
- Raw HTML input exceeds 200,000 character limit — request rejected
- URL string shorter than 8 characters — validation error
- Private or loopback IP in URL rejected for SSRF safety

## How this service works

Call when an agent needs action attributes of //form via //form/@action from a public page or HTML (SSRF-safe). Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/xpath-form-action first.

## Output

Returns the value of the action attribute from the first or primary HTML form found on the page (via XPath //form/@action), typically a relative or absolute URL string indicating where the form submits.

## 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/xpath-form-action-extractor-f66cfd13/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)