curl --request GET \
  --url https://api.coinbase.com/api/v3/brokerage/cfm/balance_summary \
  --header 'Authorization: Bearer <token>'

{
  "balance_summary": {
    "futures_buying_power": {
      "value": "<string>",
      "currency": "<string>",
      "cbrn": "<string>"
    },
    "total_usd_balance": {
      "value": "<string>",
      "currency": "<string>",
      "cbrn": "<string>"
    },
    "cbi_usd_balance": {
      "value": "<string>",
      "currency": "<string>",
      "cbrn": "<string>"
    },
    "cfm_usd_balance": {
      "value": "<string>",
      "currency": "<string>",
      "cbrn": "<string>"
    },
    "total_open_orders_hold_amount": {
      "value": "<string>",
      "currency": "<string>",
      "cbrn": "<string>"
    },
    "unrealized_pnl": {
      "value": "<string>",
      "currency": "<string>",
      "cbrn": "<string>"
    },
    "daily_realized_pnl": {
      "value": "<string>",
      "currency": "<string>",
      "cbrn": "<string>"
    },
    "initial_margin": {
      "value": "<string>",
      "currency": "<string>",
      "cbrn": "<string>"
    },
    "available_margin": {
      "value": "<string>",
      "currency": "<string>",
      "cbrn": "<string>"
    },
    "liquidation_threshold": {
      "value": "<string>",
      "currency": "<string>",
      "cbrn": "<string>"
    },
    "liquidation_buffer_amount": {
      "value": "<string>",
      "currency": "<string>",
      "cbrn": "<string>"
    },
    "liquidation_buffer_percentage": "<string>",
    "intraday_margin_window_measure": {
      "margin_window_type": "FCM_MARGIN_WINDOW_TYPE_UNSPECIFIED",
      "margin_level": "MARGIN_LEVEL_TYPE_UNSPECIFIED",
      "initial_margin": "<string>",
      "maintenance_margin": "<string>",
      "liquidation_buffer": "<string>",
      "total_hold": "<string>",
      "futures_buying_power": "<string>"
    },
    "overnight_margin_window_measure": {
      "margin_window_type": "FCM_MARGIN_WINDOW_TYPE_UNSPECIFIED",
      "margin_level": "MARGIN_LEVEL_TYPE_UNSPECIFIED",
      "initial_margin": "<string>",
      "maintenance_margin": "<string>",
      "liquidation_buffer": "<string>",
      "total_hold": "<string>",
      "futures_buying_power": "<string>"
    },
    "total_pending_transfers_amount": {
      "value": "<string>",
      "currency": "<string>",
      "cbrn": "<string>"
    },
    "funding_pnl": {
      "value": "<string>",
      "currency": "<string>",
      "cbrn": "<string>"
    }
  }
}