curl --request GET \
  --url https://api.roxom.com/v1/accounts/balance \
  --header 'X-API-Key: <api-key>' \
  --header 'X-API-Signature: <api-key>'

{
  "data": {
    "balances": [
      {
        "asset": "<string>",
        "assetClass": "<string>",
        "available": "<string>",
        "current": "<string>",
        "lockedInOrders": "<string>"
      }
    ],
    "lastUpdated": 123
  },
  "error": true
}