import { EvmClient } from './EvmClient';
export declare class Erc20Client {
    readonly client: EvmClient;
    readonly address: string;
    constructor(client: EvmClient, address: string);
    private validateClient;
    private validateContract;
    private validateContractAddress;
    balanceOf(account: string): Promise<bigint>;
    decimals(): Promise<number>;
    allowance(owner: string, spender: string): Promise<bigint>;
    approve(spender: string, amount: bigint): string;
}