$BTC BTC/ETH means you are trading Bitcoin against Ethereum.
If the price of BTC/ETH is 15, it means 1 BTC = 15 ETH.
If you want to buy ETH using BTC, you are exchanging a certain amount of BTC for the equivalent value in ETH, based on the current market price.
Why Use BTC Pairs?
1. Global Benchmark: Bitcoin is considered the primary cryptocurrency, making it a common reference point.
2. Liquidity: BTC pairs tend to have high liquidity, ensuring faster trade execution.