private static string GetSymbol(IExchangeAPI api) { if (api is ExchangeKrakenAPI) { return(api.NormalizeSymbol("XXBTZUSD")); } else if (api is ExchangeBittrexAPI || api is ExchangePoloniexAPI) { return(api.NormalizeSymbol("BTC-LTC")); } return(api.NormalizeSymbol("BTC-USD")); }