# agentshelf.syntexa.ch OG Image Alt Extractor

> agentshelf.syntexa.ch OG Image Alt Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-29).

Extracts the og:image:alt meta tag value from a public web page URL or raw HTML, SSRF-safe, for $0.005 USDC per call.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/profile-og-image-alt?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-syntexa-ch-og-image-alt-extractor-d54e6d42
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QuDp_5P2JzI4izYcF3tAi

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-syntexa-ch-og-image-alt-extractor-d54e6d42 -d '<json body>'
```

Example prompt: Can you pull the og:image:alt text from https://example.com/product-page for me?

## When to prefer this

Use this endpoint when you need only the og:image:alt tag from a page and want SSRF-safe URL fetching built in. Prefer the unpaid POST /v1/sandbox/profile-og-image-alt for testing; switch to this paid endpoint for production use. Choose this over general-purpose scrapers when you need a lightweight, single-field Open Graph extractor without the overhead of full page parsing.

## Known failure modes

- URL is unreachable or returns non-200 status — extraction fails
- Page has no og:image:alt meta tag — returns empty or null value
- HTML input exceeds 200,000 character limit — request rejected
- URL is flagged as SSRF-unsafe (private IP, localhost) — blocked by SSRF protection
- Malformed HTML may cause parser to miss the tag — partial or null result
- Payment of $0.005 USDC not provided — 402 Payment Required response

## How this service works

Call when an agent needs og:image:alt extracted from a public page or HTML (SSRF-safe). Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/profile-og-image-alt first.

## Output

Returns the extracted og:image:alt string value from the Open Graph meta tag found in the provided URL or HTML content. If the tag is absent or could not be parsed, returns a null or empty result.

## 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-syntexa-ch-og-image-alt-extractor-d54e6d42/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)