#TradingPairs101 In crypto, common pairs include BTC/ETH, USDT/BTC, or ETH/USDC, where you trade one cryptocurrency for another or for a fiat currency. In forex, pairs like EUR/USD or GBP/JPY dominate, categorized as majors, minors, or exotics based on liquidity and trading volume. Stocks and commodities also use pairs, often against a fiat currency or index.