# RDAP Domain Lookup

> RDAP Domain Lookup is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Fetches registrar, registration status, and registration dates for a domain via RDAP for trust, compliance, and domain operations.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/rdap-lookup
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-delx-ai-6c222e51
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HdIThB6oPMFqGdv3-wVnS

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 api-delx-ai-6c222e51 -d '<json body>'
```

Example prompt: Can you look up the registrar, registration date, and current status for the domain openai.com so I can verify its legitimacy for compliance purposes?

## When to prefer this

Use this endpoint when you need authoritative registrar and registration date data directly from RDAP (the modern replacement for WHOIS) for a specific domain — ideal for trust scoring, compliance audits, phishing investigation, or domain operations pipelines where structured, machine-readable output is required.

## Known failure modes

- Domain not found in RDAP — returns error or empty record
- Invalid domain format — request rejected with validation error
- RDAP registry timeout — upstream lookup failure
- Domain uses a registry with no RDAP support — partial or no data returned
- Rate limit exceeded — 429 response

## How this service works

Fetch registrar, status, and registration dates for trust, compliance, and domain ops.

## Output

Returns registrar name, domain registration status codes, creation date, expiration date, and last-updated timestamp sourced from RDAP — structured for trust verification, compliance checks, and domain operations workflows.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "domain": {
   "type": "string"
  },
  "timeout": {
   "type": "integer",
   "maximum": 15,
   "minimum": 1
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "domain": "example.com",
   "handle": "EXAMPLE1-EXAMPLE",
   "statuses": [
    "active"
   ],
   "registrar": "Example Registrar",
   "expires_at": "2030-01-01T00:00:00Z",
   "registered_at": "2020-01-01T00:00:00Z"
  },
  "tool_name": "util_rdap_lookup"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-delx-ai-6c222e51/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)