$BTC A BTC coin pair refers to a trading pair involving Bitcoin (BTC) and another cryptocurrency on a trading platform. For example, in the BTC/ETH pair, BTC is traded against Ethereum (ETH). This means you can buy ETH using BTC or sell ETH for BTC. BTC pairs are popular because Bitcoin is the most widely recognized and traded cryptocurrency. They allow traders to measure the value of other cryptocurrencies in terms of Bitcoin rather than traditional fiat currencies like USD. BTC pairs are crucial in crypto exchanges, providing liquidity and serving as a benchmark for other cryptocurrencies' values.