# 402registry AI Crawler Discoverability Audit (Pack Four)

> 402registry AI Crawler Discoverability Audit (Pack Four) is a paid API for AI agents from 402registry.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-14).

Pay-per-check audit that reports what AI crawlers (GPTBot, ClaudeBot, PerplexityBot, OAI-SearchBot) actually see on a given site, returning a verdict and optionally a dated badge and registry listing.

## Facts

- Endpoint: GET https://402registry.com/buy/four?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/402registry-ai-crawler-discoverability-audit-pack-four-d5a39d0b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dCfzEfeiTt7Ujj2I9QJkv

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 402registry-ai-crawler-discoverability-audit-pack-four-d5a39d0b
```

Example prompt: Can you run an AI crawler discoverability audit on https://example.com and tell me whether GPTBot, ClaudeBot, PerplexityBot, and OAI-SearchBot can actually see the site — and whether it earns a registry listing?

## When to prefer this

Choose this endpoint when you need to know specifically what AI crawlers see on a website — not what a browser renders — and want an authoritative, dated audit result with optional badge and registry listing. Prefer it over generic SEO tools when the goal is AI-era discoverability rather than traditional search engine ranking.

## Known failure modes

- Invalid or unreachable site URL returns error verdict
- Site actively blocks AI crawlers results in 'not listed' verdict
- Insufficient payment or expired pack returns authorization error
- Malformed input schema returns 400-level error
- Site returns non-standard HTTP responses that confuse the crawler check

## How this service works

Agent-visibility check: does an AI crawler (GPTBot, ClaudeBot, PerplexityBot, OAI-SearchBot) actually see your site? BEST-RATE pack: 4 checks for $5 ($1.25/check). Same service, smallest entry $2 at https://402registry.com/buy/one. Ladder: 1/$2, 2/$3, 4/$5. All packs: https://402registry.com/.well-known/402registry.json. A passing check earns a dated badge and a registry listing. No account, no card, no human.

## Output

Returns a JSON object indicating whether the audit passed (ok), the pack name (four), the audited site URL, a link to the full report, a verdict (e.g. 'listed'), and the number of checks remaining in the pack.

## 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",
      "HEAD"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "pack": "four",
  "site": "https://example.com",
  "report": "https://402registry.com/r/<id>",
  "verdict": "listed",
  "checksLeft": 3
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/402registry-ai-crawler-discoverability-audit-pack-four-d5a39d0b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 402registry.com](https://www.zero.xyz/host/402registry.com/llms.txt)