# AgentShelf DNS-Prefetch Link Extractor

> AgentShelf DNS-Prefetch Link Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-23).

Extracts all rel=dns-prefetch link hrefs from a given public URL or raw HTML in an SSRF-safe manner

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/profile-rel-dns-prefetch?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-dns-prefetch-link-extractor-e5f2fcad
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Jl_pmE8vBOKLOmvWCSRY7

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-dns-prefetch-link-extractor-e5f2fcad -d '<json body>'
```

Example prompt: Can you extract all the rel=dns-prefetch link hrefs from https://example.com for me?

## When to prefer this

Use this endpoint when you need to programmatically extract dns-prefetch link relations from a webpage or HTML blob in a reliable, SSRF-safe way without setting up your own HTML parser. Prefer this over generic HTML scrapers when you specifically need dns-prefetch hrefs isolated. A free sandbox alternative (POST /v1/sandbox/profile-rel-dns-prefetch) should be tried first to avoid the $0.006 USDC charge.

## Known failure modes

- URL is not publicly accessible or returns a non-200 status — endpoint may return an error or empty result
- HTML content exceeds 200,000 character limit — request rejected
- URL string shorter than 8 characters or longer than 2,048 characters — validation error
- Neither url nor html field provided — missing required input
- Target page has no rel=dns-prefetch link tags — returns empty list
- SSRF-blocked URL (private/internal IP ranges) — rejected for security reasons

## How this service works

Call when an agent needs link rel=dns-prefetch hrefs extracted from a public page or HTML (SSRF-safe). Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/profile-rel-dns-prefetch first.

## Output

A list of href values found in <link rel="dns-prefetch" href="..."> tags within the provided URL's page source or the supplied raw HTML. Returns an array of domain/URL strings corresponding to each dns-prefetch hint discovered.

## 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-dns-prefetch-link-extractor-e5f2fcad/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)