Ethereum Account Balance Checker

class BalanceChecker:
    """
    A class for checking Ethereum account balances.
    """

    def __init__(self, provider_url: str):
        """
        Initialize the balance checker with an Ethereum node URL.

        Args:
            provider_url: HTTP URL of the Ethereum node (e.g., 'http://localhost:8545')
        """
        pass

    def get_balance_wei(self, address: str) -> int:
        """
        Get the balance of an address in wei.

        Args:
            address: Ethereum address or ENS name

        Returns:
            Balance in wei as an integer
        """
        pass

    def get_balance_ether(self, address: str) -> float:
        """
        Get the balance of an address in ether.

        Args:
            address: Ethereum address or ENS name

        Returns:
            Balance in ether as a float
        """
        pass

    def is_connected(self) -> bool:
        """
        Check if the connection to the Ethereum node is active.

        Returns:
            True if connected, False otherwise
        """
        pass