$BTC

A coin pair involving $BTC (Bitcoin) is any trading pair that includes Bitcoin as either the base or the quote currency on an exchange. Examples are BTC/USDT, BTC/ETH, BTC/BNB, etc.

In BTC/USDT, for example, BTC is the base currency and USDT (Tether) is the quote currency. The price shows how much 1 BTC is worth in USDT.

Coin pairs are crucial because they allow traders to move between cryptocurrencies and fiat-pegged assets without needing to convert to traditional money.

Bitcoin is often called the "gateway" coin: it's heavily paired because it's widely accepted, trusted, and highly liquid. Many smaller altcoins can only be bought first by exchanging Bitcoin.

Understanding how coin pairs work is essential for effective crypto trading.