# SiteSignal Link Preview

> SiteSignal Link Preview is a paid API for AI agents from trinity-throw-thursday-gravity.trycloudflare.com, paid per call via x402, $0.005/call, status down (last checked 2026-09-15).

Fetches a bounded link preview for a public webpage, returning its title, description, canonical URL, and social image.

## Facts

- Endpoint: GET https://trinity-throw-thursday-gravity.trycloudflare.com/x402/link-preview
- Price: $0.005/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitesignal-link-preview-5836b72c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Hq-WhHXNNNWaj3AJtyzv0

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 sitesignal-link-preview-5836b72c
```

Example prompt: Can you pull the link preview for https://example.com — I need the title, description, canonical URL, and social image so I can use them in a post?

## When to prefer this

Use this endpoint when you need a quick, bounded link preview extraction — title, description, canonical URL, and social image — from a single public webpage, especially in agentic workflows that enrich links for sharing, newsletters, or content aggregation. It is priced at $0.005 per call (x402), making it suitable for high-volume link enrichment pipelines. Prefer it over full-page scraping APIs when you only need social/OG metadata and not full HTML or structured body content.

## Known failure modes

- URL is not publicly accessible or returns a non-200 status
- Page has no meta description or Open Graph tags, resulting in empty fields
- Canonical URL or social image is missing from the page
- Malformed or invalid URL input causes a validation error
- Cloudflare tunnel is temporarily unavailable causing a connection error

## How this service works

Extract a bounded public webpage link preview with title, description, canonical URL, and referenced social image.

## Output

Returns a structured link preview object containing the page's title, meta description, canonical URL, and the URL of the referenced social (Open Graph or Twitter card) image — bounded to the public webpage at the provided URL.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "format": "uri"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitesignal-link-preview-5836b72c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from trinity-throw-thursday-gravity.trycloudflare.com](https://www.zero.xyz/host/trinity-throw-thursday-gravity.trycloudflare.com/llms.txt)