curl --request POST \
  --url https://api.bullring.finance/v1/banking/brl/validate \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '{
  "currency": "BRL",
  "pix_key": "667.136.083-96"
}'

{
  "currency": "BRL",
  "pix_key": "667.136.083-96"
}