# AgentShelf XPath Nav Href Extractor

> AgentShelf XPath Nav Href Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-24).

Extracts href attribute values from anchor elements within nav sections of a web page or HTML document using XPath //nav//a/@href

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/xpath-nav-href?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-xpath-nav-href-extractor-9172d83b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xwZ4v6Z4mEYwK03rlZg4S

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-nav-href-extractor-9172d83b -d '<json body>'
```

Example prompt: Can you pull all the navigation link URLs from https://example.com — specifically the href values from anchors inside nav elements?

## When to prefer this

Use this endpoint when you specifically need to extract navigation link hrefs (//nav//a/@href) from a public webpage or raw HTML, and want an SSRF-safe hosted service rather than running XPath locally. Prefer the free sandbox POST /v1/sandbox/xpath-nav-href endpoint first; fall back to this paid endpoint ($0.002 USDC) when the sandbox is unavailable or quota-limited. Choose this over generic scraping APIs when you need precise XPath-scoped nav extraction without building your own parser.

## Known failure modes

- URL is unreachable or returns non-200 status — extraction fails with an error
- HTML contains no nav elements or nav anchors — returns empty list
- SSRF-blocked URL (private IP ranges, localhost) — rejected with safety error
- HTML input exceeds 200,000 character limit — request rejected
- Malformed or invalid HTML — XPath may return partial or no results
- URL parameter too short (under 8 chars) or too long (over 2048 chars) — validation error

## How this service works

Call when an agent needs href attributes of anchors under //nav via //nav//a/@href from a public page or HTML (SSRF-safe). Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/xpath-nav-href first.

## Output

Returns a list of href attribute values found in anchor tags under nav elements on the target page or HTML, extracted via the XPath expression //nav//a/@href. The response typically includes an array of URL strings representing navigation links.

## 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-nav-href-extractor-9172d83b/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)