# SiteCheck Domain RDAP Registration Lookup

> SiteCheck Domain RDAP Registration Lookup is a paid API for AI agents from api.fadeandco.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Returns RDAP-sourced domain registration facts: registration date, age in days, expiry date, registrar, and lock status for any domain.

## Facts

- Endpoint: GET https://api.fadeandco.workers.dev/api/agent-intel/domain-authority-credibility?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-domain-rdap-registration-lookup-080c6b15
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sRb2MIEY9ANjO90Akp9HE

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 sitecheck-domain-rdap-registration-lookup-080c6b15
```

Example prompt: Can you check the registration details for wikipedia.org — specifically when it was registered, how old it is, who the registrar is, and whether it's transfer-locked?

## When to prefer this

Use this endpoint when you need authoritative, structured domain registration metadata (age, registrar, expiry, lock status) sourced directly from the public RDAP directory. Prefer it over WHOIS-based tools for machine-readable structured output. Note it does not provide SEO authority scores, backlink counts, Tranco rank, or spam indices — use dedicated SEO APIs for those.

## Known failure modes

- Domain not found in RDAP directory returns an error or empty result
- Malformed or non-existent TLD may cause RDAP lookup failure
- Rate limiting from the upstream rdap.org service could cause timeouts
- Some ccTLD registries do not publish RDAP data, resulting in incomplete responses
- Network unreachability to the RDAP endpoint returns a service error

## How this service works

Registration facts for a domain from the public RDAP directory: registration date, age in days, expiry, registrar, lock status. No authority score, backlink or spam index: no free public source for those was found (Tranco rank API needs a key; DNS-over-HTTPS was unreachable from the test network).

## Output

A JSON object containing the domain name, RDAP source URL, an array of status/lock flags (e.g. 'client transfer prohibited'), domain age in days, the timestamp the check was performed, expiry date, registrar name, last-changed date, and original registration date.

## 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": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "description": "Domain name such as wikipedia.org (a full URL is accepted and reduced to its host)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "domain": "wikipedia.org",
  "source": "https://rdap.org/domain/wikipedia.org",
  "status": [
   "client delete prohibited",
   "client transfer prohibited"
  ],
  "ageDays": 9414,
  "checkedAt": "2026-10-23T09:35:16.732Z",
  "expiresOn": "2027-01-13T00:12:14Z",
  "registrar": "MarkMonitor Inc.",
  "lastChanged": "2026-08-12T08:47:19.41Z",
  "registeredOn": "2001-01-13T00:12:14.754Z"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-domain-rdap-registration-lookup-080c6b15/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.fadeandco.workers.dev](https://www.zero.xyz/host/api.fadeandco.workers.dev/llms.txt)