$BTC coin pair refers to a trading pair that involves Bitcoin (BTC) and another cryptocurrency or fiat currency on an exchange.

In simpler terms, it’s a way to trade Bitcoin directly with another asset. Here's how it works:

A coin pair like BTC/USDT means you're trading Bitcoin against Tether (USDT).

If you see BTC/ETH, it means you're trading Bitcoin against Ethereum.

These pairs let you buy or sell BTC depending on market prices. For example, in the BTC/USDT pair:

If you want to buy BTC, you’ll use your USDT to get Bitcoin.

If you want to sell BTC, you’ll receive USDT in return.

Each pair shows the value of 1 BTC in terms of the second currency in the pair, helping traders track price changes and make decisions in the crypto market.