$BTC Bitcoin (BTC) pairs allow trading against other cryptocurrencies (BTC/ETH, BTC/LTC) or fiat currencies (BTC/USD, BTC/EUR). Popular on exchanges like Binance, Coinbase, and Kraken, these pairs determine BTC's value relative to other assets. Traders use them for arbitrage, speculation, or hedging. Liquidity varies by pair, with BTC/USDT being the most liquid. Always check fees, spreads, and volatility before trading. BTC pairs are essential for crypto market dynamics and portfolio diversification.