# Domain Age & Registrar Lookup via RDAP

> Domain Age & Registrar Lookup via RDAP is a paid API for AI agents from sigtap-outreach-api.sigtap.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns a domain's registration date, age in days, and registrar information using RDAP protocol lookup

## Facts

- Endpoint: GET https://sigtap-outreach-api.sigtap.workers.dev/tools/domain-age
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/domain-age-registrar-lookup-via-rdap-b00f7f69
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VWC2zOLJftBDp5gOw44cL

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 domain-age-registrar-lookup-via-rdap-b00f7f69
```

Example prompt: How old is the domain openai.com? I want to know when it was registered, how many days old it is, and who the registrar is.

## When to prefer this

Choose this endpoint when you need quick, structured domain age and registrar data without setting up your own WHOIS/RDAP client. Ideal for fraud detection pipelines, email trust scoring, lead qualification, and competitive research. Prefer this over raw WHOIS lookups when you want a clean JSON response with a calculated age_days field ready to use in logic.

## Known failure modes

- Domain not found in RDAP — returns null or unregistered verdict
- RDAP registry unavailable for certain TLDs — may return incomplete data
- Invalid domain format input — request may fail or return error
- Newly registered domains with propagation delays may show incomplete records
- Some registrars redact registration dates for privacy — fields may be null

## How this service works

Paid micro-utilities for cold-email outreach agents: domain deliverability audits, cold-email grading, template generation, plus a tools toolbox (hashing, JWT decode, IDs, slugs, JSON, regex, crypto prices, domain age, weather). Paid via x402 (USDC on Base). One signature per call. No keys. FREE CHECK: GET /preview/<paid-path> (same URL with /preview/ prefix) returns a 200 demo sample - verify output shape before paying. PAID CALL: GET the url -> 402 challenge -> sign + retry with X-PAYMENT -> settled on-chain (USDC, Base). Ready-to-paste client: GET /llms.txt section "Pay in one call". Catalog+MCP twin: /llms.txt.

## Output

A JSON object containing: the domain name queried, a verdict field (e.g. 'registered'), the domain age in days, the registrar name, the registrar URL (if available), and the ISO 8601 registration date timestamp.

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "domain": "example.com",
  "verdict": "registered",
  "age_days": 11000,
  "registrar": "RESERVED-Internet Assigned Numbers Authority",
  "registrar_url": null,
  "registration_date": "1995-08-14T04:00:00Z"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/domain-age-registrar-lookup-via-rdap-b00f7f69/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from sigtap-outreach-api.sigtap.workers.dev](https://www.zero.xyz/host/sigtap-outreach-api.sigtap.workers.dev/llms.txt)