export declare class RetroBridgeApiService {
    private static readonly RETRO_BRIDGE_API_ENDPOINT;
    private static API_KEY;
    static getMessageToAuthWallet(): Promise<string>;
    static sendSignedMessage(walletAddress: string, signature: string, networkType: string): Promise<never | void>;
    static checkWallet(walletAddress: string, networkType: string): Promise<string>;
}