Domain availability check API

Is a domain registered? Checks RDAP (the registry protocol): a 404 means available, a record means taken (with creation/expiry when shown). Answers 'is example.com available', 'is this domain taken', 'when does this domain expire', 'can I register this domain'.

Price$0.01per request

MethodPOST

Route/v1/web/domain-available

StatusLive

MIME typeapplication/json

Rate limit60/minute

Cache3600s public

webdomainavailabilityrdapwhoisregistrationnamingbranding

API URLhttps://x402.hexl.dev/v1/web/domain-available

Integration docs

Example request

{
  "domain": "example.com"
}

Example response

{
  "domain": "example.com",
  "available": false,
  "registered": true,
  "registeredOn": "1995-08-14T04:00:00Z",
  "expiresOn": "2026-08-13T04:00:00Z",
  "note": "Domain is registered."
}

Input schema

{
  "type": "object",
  "required": [
    "domain"
  ],
  "properties": {
    "domain": {
      "type": "string",
      "examples": [
        "example.com"
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}