curl --request POST \
  --url https://whitebit.com/api/v4/convert/confirm \
  --header 'Content-Type: application/json' \
  --header 'X-TXC-APIKEY: <api-key>' \
  --data '
{
  "quoteId": "4050"
}
'

{
  "finalGive": "0.00002901",
  "finalReceive": "1"
}