# SiteSignal Agent Discovery Readiness

> SiteSignal Agent Discovery Readiness is a paid API for AI agents from phases-prot-shine-royal.trycloudflare.com, paid per call via x402, $0.04/call, status down (last checked 2026-09-16).

Audits a public website for AI-agent discovery controls including llms.txt, OpenAPI specs, agent cards, robots.txt, and sitemaps.

## Facts

- Endpoint: GET https://phases-prot-shine-royal.trycloudflare.com/x402/agent-discovery
- Price: $0.04/call
- Payment: x402
- Status: down
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitesignal-agent-discovery-readiness-5268258a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_u2O3sG5eCcdtgXBIv23DU

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-agent-discovery-readiness-5268258a
```

Example prompt: Can you audit https://example.com to check if it has llms.txt, an OpenAPI spec, agent cards, robots.txt, and a sitemap — I want to know if it's ready for AI agent discovery?

## When to prefer this

Use this endpoint when you need to quickly determine whether a public website has implemented the standard AI-agent discovery controls (llms.txt, OpenAPI, agent cards, robots.txt, sitemap) before building an integration or assessing a site's AI-readiness. Prefer this over manual inspection or general web scraping when you need a structured, consolidated audit of all major discovery signals in a single call.

## Known failure modes

- URL is unreachable or returns non-200 status — endpoint may return error or empty results
- Website blocks crawlers via firewall or CAPTCHA — discovery controls may be undetectable
- URL parameter missing or malformed — returns validation error
- Site uses non-standard paths for discovery files — controls may not be detected
- Cloudflare tunnel may be temporarily unavailable — returns connection error

## How this service works

Audit a public website for AI-agent discovery controls such as llms.txt, OpenAPI, agent cards, robots, and sitemap.

## Output

Returns a structured snapshot of the website's AI-agent discovery controls, indicating presence or absence of llms.txt, OpenAPI specifications, agent cards, robots.txt directives, and sitemap files, along with source-linked evidence and readiness signals for each control.

## 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"
      },
      "agentUseCase": {
       "type": "string"
      }
     }
    }
   },
   "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-agent-discovery-readiness-5268258a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from phases-prot-shine-royal.trycloudflare.com](https://www.zero.xyz/host/phases-prot-shine-royal.trycloudflare.com/llms.txt)