$BTC A coin pair with BTC refers to a cryptocurrency trading pair where Bitcoin (BTC) is used as the base or quote currency. For example, in the pair ETH/BTC, Ethereum (ETH) is traded against Bitcoin. These pairs allow traders to exchange altcoins directly with BTC without converting to fiat. BTC pairs are widely popular due to Bitcoin’s high liquidity and dominance in the crypto market. They help gauge the relative strength of altcoins against BTC. Trading such pairs requires understanding BTC's market movements, as price fluctuations in Bitcoin significantly affect the value of the paired coin and trading strategies.