public async Task <IEnumerable <ITicker> > MarketSummaries()
{
var prices = await _binance.GetPrices();
var pricesDic = prices.ToDictionary(p => p.symbol);
var books = await _binance.GetBooks();
var tickersDic = books.ToDictionary(b => b.symbol);
return(pricesDic.Keys.Select(k => new Market(pricesDic[k], tickersDic[k])));
}
