import BigNumber from 'bignumber.js';
import Web3 = require('web3');
export interface IGasPriceFetchingService {
    fetchGasPrice(): Promise<GasPriceEstimation>;
}
export declare type GasPriceEstimation = EthGasStationInfo | BlockScaleInfo;
export interface EthGasStationInfo {
    average: BigNumber;
    avgWait: BigNumber;
    blockTime: BigNumber;
    fast: BigNumber;
    fastWait: BigNumber;
    fastest: BigNumber;
    fastestWait: BigNumber;
    safeLow: BigNumber;
    safeLowWait: BigNumber;
}
export interface BlockScaleInfo {
    average: BigNumber;
    fast: BigNumber;
    fastest: BigNumber;
    safeLow: BigNumber;
}
export default class GasPriceUtil {
    static getEthGasStationStats(): Promise<EthGasStationInfo>;
    private web3;
    constructor(web3: Web3);
    networkGasPrice(): Promise<BigNumber>;
    getAdvancedNetworkGasPrice(): Promise<GasPriceEstimation>;
    getGasPrice(): Promise<BigNumber>;
    private externalApiGasPrice;
}