curl --request GET \
  --url https://api.aries.com/v1/accounts/{id}/balances \
  --header 'Authorization: Bearer <token>'

{
  "dayTradeBuyingPower": "<string>",
  "dayTradeOvernightRegTBuyingPower": "<string>",
  "grossMargin": "<string>",
  "heldBackFunds": "<string>",
  "netBuyingPower": "<string>",
  "optionBuyingPower": "<string>",
  "pendingOrdersMarginRequirements": "<string>",
  "settledFunds": "<string>",
  "sodPositionsMarketValue": "<string>",
  "stockBuyingPower": "<string>",
  "totalEquity": "<string>",
  "unsettledFunds": "<string>"
}