Creating Opportunity using Rest API with a particular record type

Okey - It was not straight. Input should be as below:

{
  "Name": "Test1",
  "CloseDate": "2018-08-01",
  "StageName": "New",
  "Probability": "10",
  "Amount": "2000",
  "RecordType": {
    "Name": "TEST Record Type"
  }
}