curl --request POST \
  --url https://api.coinbase.com/api/v3/brokerage/portfolios \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "name": "<string>"
}'

{
  "portfolio": {
    "name": "<string>",
    "uuid": "<string>",
    "type": "UNDEFINED",
    "deleted": true
  }
}