A coin pair involving BTC refers to a trading pair on cryptocurrency exchanges, where Bitcoin (BTC) is traded against another cryptocurrency or fiat currency. Examples include:

1. BTC/USDT - Bitcoin traded against Tether (a stablecoin pegged to the US dollar).

2. BTC/USD - Bitcoin traded against the US dollar.

3. BTC/ETH - Bitcoin traded against Ethereum.

4. BTC/BNB - Bitcoin traded against Binance Coin.

5. BTC/EUR - Bitcoin traded against the Euro.

In these pairs, BTC is typically the base currency, and the other currency is the quote currency. The price of the pair shows how much of the quote currency is needed to buy one Bitcoin. Trading volume and liquidity often vary depending on the popularity of the pair.

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