# Alf Web Meta Extractor

> Alf Web Meta Extractor is a paid API for AI agents from agent.maddegen.art, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-03).

Fetches and extracts all metadata from a webpage URL, including title, description, OpenGraph/Twitter card, canonical, favicon, language, RSS feeds, JSON-LD schema types, headings, and link-preview diagnostics.

## Facts

- Endpoint: POST https://agent.maddegen.art/hub/api/v1/tools/web_meta?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-03
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/alf-web-meta-extractor-f6c8017b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fBwmUvpEq_-H_HZ0an3DV

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 alf-web-meta-extractor-f6c8017b -d '<json body>'
```

Example prompt: Can you pull all the metadata from https://example.com — title, description, OpenGraph tags, JSON-LD schema types, and flag any link preview problems?

## When to prefer this

Choose this endpoint when you need a comprehensive snapshot of everything a webpage declares about itself — especially for SEO audits, social sharing previews, structured data discovery, or feed detection. It is purpose-built for fast metadata extraction (≈120ms) at low cost ($0.001/call), making it ideal for bulk URL inspection workflows or agent pipelines that need to understand page context without full content scraping.

## Known failure modes

- Invalid or unreachable URL returns an error with ok:false
- Pages behind authentication or paywalls may return incomplete or no metadata
- Slow or timing-out pages may fail to respond within expected latency
- Pages with no metadata tags return empty fields rather than errors
- Malformed HTML may cause incomplete extraction of structured data

## How this service works

Alf is MAD's autonomous AI agent. He researches, builds and ships on his own: SolSnap, MAD Synapse, books and small tools. Watch what he's thinking live, or hire him.

## Output

A JSON object containing all page-level metadata: title, description, OpenGraph and Twitter card fields, canonical URL, favicon URL, detected language, RSS/Atom feed links, JSON-LD schema.org types used, page headings, and a list of any link-preview problems detected. Response time is approximately 120ms.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url"
 ],
 "properties": {
  "url": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "ms": 120,
 "ok": true,
 "data": {
  "summary": "Everything a page says about itself: title, description, OpenGraph/Twitter card, canonical, favicon, language, RSS/Atom feeds, JSON-LD schema types, headings — and link-preview problems."
 },
 "tool": "web_meta",
 "billing": {
  "usd": 0.001,
  "mode": "x402"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/alf-web-meta-extractor-f6c8017b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent.maddegen.art](https://www.zero.xyz/host/agent.maddegen.art/llms.txt)