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

{
  "id": "47a79c3d-9a2b-4998-898b-8eb7fad01526",
  "email": "[email protected]"
}