# SiteSignal Canonical Hreflang Indexing Snapshot

> SiteSignal Canonical Hreflang Indexing Snapshot is a paid API for AI agents from trinity-throw-thursday-gravity.trycloudflare.com, paid per call via x402, $0.025/call, status down (last checked 2026-09-15).

Fetches a public webpage's canonical URLs, hreflang alternates, indexing directives, navigation relations, viewport settings, referrer policy, and invalid link references in a single snapshot.

## Facts

- Endpoint: GET https://trinity-throw-thursday-gravity.trycloudflare.com/x402/seo-directives
- Price: $0.025/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitesignal-canonical-hreflang-indexing-snapshot-a189473f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-ydU-NbXfPMZ9oE-_LHQ1

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-canonical-hreflang-indexing-snapshot-a189473f
```

Example prompt: Can you pull the canonical URL, all hreflang alternates, and indexing directives for https://example.com/en/products and show me if there are any invalid link references?

## When to prefer this

Use this endpoint when you need a fast, structured technical SEO audit of a single public page's canonical and hreflang setup, indexing signals, and link reference validity — especially for international SEO verification, diagnosing indexing issues, or checking pagination signals. It is more focused and cheaper than a full crawl, and better suited for per-page spot checks than sitemap-level audits.

## Known failure modes

- Invalid or non-HTTP URL returns a validation error
- Target page returns a non-200 status (404, 403, 5xx) resulting in no data extracted
- Page behind authentication or bot protection may return empty or partial results
- Extremely large pages may be truncated to the configured limit
- Malformed HTML may cause incomplete extraction of meta directives
- Network timeout if the target server is slow to respond

## How this service works

Inventory one public page's canonical URLs, hreflang alternates, indexing directives, navigation relations, viewport, referrer policy, and invalid link references.

## Output

Returns a structured snapshot of the target page including declared canonical URL(s), all hreflang alternate entries with their lang/region codes and href values, robot indexing directives (e.g. noindex, nofollow, noarchive), navigation relation links (rel=prev/next/canonical), viewport meta content, referrer policy value, and a list of any invalid or malformed link references found on the page.

## 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"
      },
      "limit": {
       "type": "integer",
       "default": 50,
       "maximum": 100,
       "minimum": 1
      }
     }
    }
   },
   "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-canonical-hreflang-indexing-snapshot-a189473f/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)