/******************************************************************************
 *
 *  (C) 2022 AhnLab Blockchain Company, Inc. All rights reserved.
 *  Any part of this source code can not be copied with any method without
 *  prior written permission from the author or authorized person.
 *
 ******************************************************************************/
import { DekeyStore } from '../store';
/**
 * A controller that polls for token exchange
 * rates based on a user's current token list
 */
export declare class TokenRatesService {
    private dekeyStore;
    _handle: any;
    exchangeRates: any;
    lastTimestamp: any;
    constructor(dekeyStore: DekeyStore);
    /**
     * Updates exchange rates for all tokens
     */
    updateExchangeRates(): Promise<void>;
    start(interval?: number): void;
    stop(): void;
    getEthereumRates(): {
        usd: number;
    };
    isExchangeRatesStale(): boolean;
}