// Interested in the public polling market data feed (no authentication)
PollingMarketDataService marketDataService = exchange.getPollingMarketDataService();
// Get the latest order book data for GHs/BTC
OrderBook orderBook = marketDataService.getOrderBook(new CurrencyPair(Currencies.GHs, Currencies.BTC));
System.out.println("Current Order Book size for GHS/BTC: " + (orderBook.getAsks().size() + orderBook.getBids().size()));
System.out.println("First Ask: " + orderBook.getAsks().get(0).toString());
System.out.println("First Bid: " + orderBook.getBids().get(0).toString());
System.out.println("Timestamp: " + orderBook.getTimeStamp().toString());