curl --request POST \
  --url https://api.prod.polymarketexchange.com/v1/positions/balance \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "currency": "<string>"
}
'

{
  "balance": "<string>",
  "capitalRequirement": "<string>",
  "excessCapital": "<string>",
  "buyingPower": "<string>",
  "securities": {},
  "totalSecurityNotionalValue": "<string>",
  "totalSecurityAvailableValue": "<string>",
  "openOrders": "<string>",
  "alternateCapitalRequirementCurrency": "<string>",
  "alternateCapitalRequirement": "<string>",
  "unsettledFunds": "<string>",
  "marginRequirement": "<string>",
  "updateTime": "2023-11-07T05:31:56Z"
}