# AgentShelf Facebook App ID Extractor

> AgentShelf Facebook App ID Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-02).

Extracts the fb:app_id meta property from a public webpage URL or raw HTML, with SSRF protection.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/profile-fb-app-id?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-facebook-app-id-extractor-8ddd31a4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eKUDCEMjbMbntICLh0QZ3

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-facebook-app-id-extractor-8ddd31a4 -d '<json body>'
```

Example prompt: Can you extract the Facebook App ID from https://www.shopify.com — I want to see which fb:app_id they have configured in their page metadata?

## When to prefer this

Use this endpoint when you need to programmatically extract the fb:app_id Open Graph meta property from a public webpage or known HTML snippet. Prefer the free sandbox endpoint (/v1/sandbox/profile-fb-app-id) for testing before using this paid version. Choose this over general HTML scrapers when you need a targeted, SSRF-safe extraction of specifically the Facebook App ID without processing the full DOM yourself.

## Known failure modes

- URL is unreachable or returns non-200 status — extraction fails with an error
- Page has no fb:app_id meta property — returns empty or null result
- URL points to a private/internal IP address — rejected by SSRF protection
- HTML input exceeds 200,000 character limit — request rejected
- Malformed URL input — validation error returned
- Page uses JavaScript rendering to inject meta tags — statically parsed content may miss dynamically injected fb:app_id

## How this service works

Call when an agent needs fb:app_id extracted from a public page or HTML (SSRF-safe). Exact $0.004 USDC. Prefer unpaid POST /v1/sandbox/profile-fb-app-id first.

## Output

Returns the extracted fb:app_id value found in the page's meta tags (e.g. the numeric Facebook App ID string), or an empty/null result if no fb:app_id is present. The endpoint fetches the URL safely (SSRF-protected) or parses provided HTML directly.

## 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-facebook-app-id-extractor-8ddd31a4/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)