import { BigNumber as BigNumberJs } from 'bignumber.js';
import BaseExchangeApi from './BaseExchangeApi';
import HttpWrapper from '../common/HttpWrapper';
export declare type CoinBaseResponse = {
    data: {
        currency: string;
        rates: Record<string, string>;
    };
};
export default class CoinBase extends BaseExchangeApi {
    readonly _httpWrapper: HttpWrapper;
    private readonly _baseUrl;
    private readonly _priceApiPath;
    private _url;
    constructor(_httpWrapper?: HttpWrapper, _baseUrl?: string, _priceApiPath?: string);
    queryExchangeRate(sourceCurrency: string, targetCurrency: string): Promise<BigNumberJs>;
}