import { Address, Hex, WalletClient } from 'viem';
import { Account as BorosAccount } from '../../types/common';
export declare function setInternalAgent(agent: Agent | null): void;
export declare function getInternalAgent(): Agent;
export declare class Agent {
    private readonly privateKey;
    walletClient: WalletClient;
    private constructor();
    private createApproveAgentMessage;
    private getApproveAgentData;
    static createFromPrivateKey(privateKey: Hex): Agent;
    static create(userWalletClient: WalletClient): Promise<{
        agent: Agent;
        privateKey: Hex;
    }>;
    approveAgent(userWalletClient: WalletClient, expiry_s: number, nonce?: bigint): Promise<Hex>;
    getExpiry(account: BorosAccount): Promise<number>;
    getAddress(): Promise<Address>;
}