curl --request POST \
  --url https://api.bullring.finance/v1/ramp/subaccount \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '{
  "email": "[email protected]"
}'

{
  "id": "6a0fd7af-181d-4c0f-b24b-b8cfb739dabc",
  "email": "[email protected]",
  "status": "created"
}