export declare class DataService {
    private baseUrl;
    getAccountBalances(accountAddress: string, chainId: number, dataApiKey: string): Promise<any>;
    getTransaction(hash: string, chainId: number, dataApiKey: string): Promise<any>;
    getNftsList(accountAddress: string, chainId: number, dataApiKey: string): Promise<any>;
    private getCommonHeaders;
}