curl --request GET \
  --url https://api.coinbase.com/api/v3/brokerage/intx/balances/{portfolio_uuid}

{
  "portfolio_balances": [
    {
      "portfolio_uuid": "<string>",
      "balances": [
        {
          "asset": {
            "asset_id": "<string>",
            "asset_uuid": "<string>",
            "asset_name": "<string>",
            "status": "<string>",
            "collateral_weight": "<string>",
            "account_collateral_limit": "<string>",
            "ecosystem_collateral_limit_breached": true,
            "asset_icon_url": "<string>",
            "supported_networks_enabled": true
          },
          "quantity": "<string>",
          "hold": "<string>",
          "transfer_hold": "<string>",
          "collateral_value": "<string>",
          "collateral_weight": "<string>",
          "max_withdraw_amount": "<string>",
          "loan": "<string>",
          "loan_collateral_requirement_usd": "<string>",
          "pledged_quantity": "<string>"
        }
      ],
      "is_margin_limit_reached": true
    }
  ]
}