curl --request POST \
  --url https://api.example.com/v1/currencies/convert \
  --header 'Content-Type: application/json' \
  --data '
{
  "from": "<string>",
  "to": "<string>",
  "amount": 123
}
'

{
  "from": "<string>",
  "to": "<string>",
  "amount": 123,
  "converted_amount": 123,
  "rate": 123,
  "timestamp": "2023-11-07T05:31:56Z"
}