# AgentTools Domain Availability Checker

> AgentTools Domain Availability Checker is a paid API for AI agents from agentstoolshub.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-12).

Checks whether a domain name is registered or available using the RDAP protocol, returning registrar and registration dates for taken domains

## Facts

- Endpoint: GET https://agentstoolshub.com/api/v1/dev/domain-availability?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agenttools-domain-availability-checker-4d24dd7e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xYNx4EQkVZn27ISY__aYa

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 agenttools-domain-availability-checker-4d24dd7e
```

Example prompt: Can you check if 'morningbloom.io' is available to register, and if it's taken, tell me who the registrar is and when it expires?

## When to prefer this

Use this endpoint when you need an authoritative, registry-level answer about whether a domain is registered — not a scrape of a landing page or a third-party whois aggregator. Ideal when an agent needs to confirm domain availability before recommending a product name, or needs accurate registration metadata (creation/expiration dates, registrar) to assess how established a business is. Prefer this over general web search when a precise, machine-readable, RDAP-compliant answer is required at low cost.

## Known failure modes

- Domain not found in RDAP registry (interpreted as available — 404 response)
- Invalid or malformed domain name input returns an error
- TLD not supported by RDAP may yield incomplete or no data
- Network timeout if the authoritative RDAP server is slow to respond
- Newly registered domains may not yet appear in RDAP due to propagation delay

## How this service works

Check whether a domain name is registered or available, via the official RDAP registry protocol (404 = available). For registered domains it also returns the registrar and creation/expiration dates — useful when an agent needs to name a product or verify how long a business has existed. Use this when an agent needs to is this domain taken? Registry answer, not a landing page.

## Output

For available domains: a 404-equivalent indicating the domain is unregistered and free to claim. For registered domains: availability status (taken), the registrar name, and the creation and expiration dates of the registration, sourced directly from the official RDAP registry.

## 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"
      }
     }
    }
   },
   "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/agenttools-domain-availability-checker-4d24dd7e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentstoolshub.com](https://www.zero.xyz/host/agentstoolshub.com/llms.txt)