$BTC A coin pair with BTC (Bitcoin) involves trading another cryptocurrency directly against Bitcoin. Instead of using fiat currency like USD, BTC serves as the base currency. For example, in the ETH/BTC pair, you buy or sell Ethereum using Bitcoin. These pairs are popular among crypto traders due to BTC’s dominance and liquidity. They allow users to gauge the relative strength of altcoins against Bitcoin. BTC pairs are common on major exchanges and help diversify portfolios, especially in markets where fiat trading is restricted. Monitoring BTC pairs also offers insights into market sentiment and the performance of altcoins relative to Bitcoin.