curl --request GET \
  --url https://api.sandbox.bitwage.com/api/wallets \
  --header 'Authorization: Basic <encoded-value>'

{
  "wallets": [
    {
      "id": "custodial_account_123",
      "balance": "<string>",
      "currency": "<string>",
      "is_default": true
    }
  ]
}