# AgentShelf modulepreload Link Extractor

> AgentShelf modulepreload Link Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-23).

Extracts all link[rel=modulepreload] href values from a public webpage URL or raw HTML, with SSRF protection.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/profile-rel-modulepreload?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-modulepreload-link-extractor-27b5bf94
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_l2leFVAhh8AeegwOZYved

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-modulepreload-link-extractor-27b5bf94 -d '<json body>'
```

Example prompt: Fetch https://example.com and pull out all the link rel=modulepreload hrefs from that page so I can see which JavaScript modules it preloads.

## When to prefer this

Use this endpoint when you need to programmatically identify all modulepreload link hints declared on a public webpage or within raw HTML, particularly for auditing frontend performance strategies, analyzing JavaScript module bundling, or verifying preload declarations. Prefer the free sandbox endpoint (/v1/sandbox/profile-rel-modulepreload) for testing. Use this paid endpoint for production workloads requiring SSRF-safe fetching of live URLs.

## Known failure modes

- URL is unreachable or returns non-200 status — endpoint may return an error or empty result
- SSRF-blocked URLs (private IP ranges, localhost) will be rejected for security reasons
- HTML exceeds 200,000 character limit — request will be rejected
- URL string shorter than 8 characters or longer than 2048 characters — validation error
- Page has no link[rel=modulepreload] elements — returns empty list
- Payment of $0.008 USDC not provided or rejected — 402 Payment Required response

## How this service works

Call when an agent needs link rel=modulepreload hrefs extracted from a public page or HTML (SSRF-safe). Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/profile-rel-modulepreload first.

## Output

A list of href values found in link[rel=modulepreload] elements on the target page or within the provided HTML. Typically returns an array of URLs or paths pointing to JavaScript module resources that the page declares for preloading.

## 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-modulepreload-link-extractor-27b5bf94/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)