$BTC A BTC coin pair refers to a cryptocurrency trading pair where Bitcoin (BTC) is used as either the base or quote currency. In a BTC trading pair like BTC/ETH, Bitcoin is exchanged for Ethereum, showing how much ETH one BTC can buy. These pairs are common on crypto exchanges and allow traders to measure the value of other cryptocurrencies relative to Bitcoin. BTC is often used as a benchmark asset, much like the U.S. dollar in traditional finance. BTC pairs offer liquidity, price discovery, and arbitrage opportunities, playing a vital role in the broader cryptocurrency market ecosystem.