curl --request POST \
  --url 'https://domain.hostwithdothost.com/?action=singlecheckavailability' \
  --header 'Content-Type: application/json' \
  --data '{
  "username": "yourUsername",
  "password": "yourPassword",
  "domain": "hynitr.com"
}'

[
  {
    "TLD": "ng",
    "DomainName": "thegrtnx",
    "Status": "available",
    "Command": "create",
    "Period": 1,
    "IsFee": false,
    "Price": "5.4900",
    "Currency": "USD",
    "Reason": null
  }
]