#TradingPairs101 Trading pairs are the foundation of any transaction in the cryptocurrency market. Essentially, these are two different currencies that can be exchanged for one another. For example, in the pair BTC/USDT, you exchange Bitcoin for Tether (USDT), and vice versa. The first currency in the pair (base currency) is what you are buying or selling, while the second (quote currency) is what you pay or receive.