$BTC A **coin pair with BTC** refers to a cryptocurrency trading pair where Bitcoin (BTC) is used either as the base or quote currency. In most cases, BTC acts as the quote currency, meaning other cryptocurrencies are valued in terms of Bitcoin. For example, in the ETH/BTC pair, you’re trading Ethereum against Bitcoin. Traders use BTC pairs to assess the strength of altcoins relative to Bitcoin, rather than fiat currencies like USD. These pairs are popular on exchanges like Binance and Coinbase Pro. Common BTC pairs include ETH/BTC, XRP/BTC, and LTC/BTC. They are essential for technical analysis and crypto market strategy.