$BTC BTC pair refers to a common and important aspect of cryptocurrency trading. It means setting the rate or value of another cryptocurrency against Bitcoin. BTC pairs are used by traders and investors who treat Bitcoin as the base currency. The benefit of this pairing is that it allows you to measure the performance of altcoins relative to Bitcoin. For example, the ETH/BTC pair shows the value of Ethereum compared to Bitcoin. BTC pairs also play a key role in increasing liquidity and trading volume in the market, making them a preferred choice for many traders.