import { PublicClient, WalletClient } from 'viem';
export declare function getErc20Balance({ publicClient, tokenAddr, }: {
    publicClient: PublicClient;
    tokenAddr: `0x${string}`;
}, owner: `0x${string}`): Promise<bigint>;
export declare function getErc20Allowance({ publicClient, tokenAddr, }: {
    publicClient: PublicClient;
    tokenAddr: `0x${string}`;
}, owner: `0x${string}`, spender: `0x${string}`): Promise<bigint>;
export declare function approveErc20({ publicClient, walletClient, tokenAddr, }: {
    publicClient: PublicClient;
    walletClient: WalletClient;
    tokenAddr: `0x${string}`;
}, spender: `0x${string}`, amount: bigint): Promise<`0x${string}`>;