export default function useFetchETHBalance(chainId?: number): import("@tanstack/react-query").UseQueryResult<{
    symbol: string;
    address: string;
    name: string;
    decimals: number;
    balance: import("bignumber.js").BigNumber;
    allowance: import("bignumber.js").BigNumber;
    account: string;
    spender: string | undefined;
    chainId: number;
} | {
    address: string;
    decimals: number;
    symbol: string;
    name: string;
    balance: import("bignumber.js").BigNumber;
    spender: string | undefined;
    allowance: import("bignumber.js").BigNumber;
    chainId: number;
    account?: undefined;
} | null, Error>;
