Fetch the base fee from the latest ledger.
        In the future, we'll fetch the base fee from `/fee_stats`
        :return: base free
        :rtype: int

def base_fee(self):
        """Fetch the base fee from the latest ledger.
        In the future, we'll fetch the base fee from `/fee_stats`
        :return: base free
        :rtype: int
        """
        latest_ledger = self.ledgers(order='desc', limit=1)
        try:
            base_fee = latest_ledger['_embedded']['records'][0]['base_fee_in_stroops']
        except (KeyError, IndexError):
            base_fee = 100
        return base_fee