import type { BigNumber as BigNumberJs } from 'bignumber.js';
export declare type BaseCurrency = 'TRIF' | 'RIF' | 'RDOC' | 'RBTC' | 'TKN' | 'USDRIF';
export declare type CurrencyMapping = Partial<Record<BaseCurrency, string>>;
export interface ExchangeApi {
    queryExchangeRate: (sourceCurrency: string, targetCurrency: string) => Promise<BigNumberJs>;
}
export default abstract class BaseExchangeApi implements ExchangeApi {
    protected readonly api: string;
    private currencyMapping;
    constructor(api: string, currencyMapping: CurrencyMapping);
    protected _getCurrencyName(tokenSymbol: string): string;
    abstract queryExchangeRate(sourceCurrency: string, targetCurrency: string): Promise<BigNumberJs>;
}