import { BigNumber as BigNumberJs } from 'bignumber.js';
import BaseExchangeApi from './BaseExchangeApi';
import HttpWrapper from '../common/HttpWrapper';
export declare type CoinCodexResponse = {
    last_price_usd: string;
};
export default class CoinCodex 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>;
}