$BTC Bitcoin (BTC) serves as the primary trading pair for most cryptocurrencies, offering liquidity and stability in volatile markets. Major altcoins like Ethereum (ETH), Binance Coin (BNB), and Solana (SOL) commonly pair with BTC on exchanges, enabling traders to diversify without converting to fiat. BTC dominance influences altcoin trends—when Bitcoin rises, alts often follow, but during bear markets, traders may flock back to BTC for safety. Stablecoins like USDT have reduced BTC’s pairing dominance, yet it remains crucial for crypto-to-crypto trading. Decentralized exchanges (DEXs) also support BTC-wrapped versions (WBTC) for DeFi transactions. While BTC pairs provide flexibility, traders must monitor Bitcoin’s volatility, as sudden swings can impact entire portfolios.