$BTC Here are some popular coin pairs with Bitcoin (BTC):

1. *BTC/USDT*: Bitcoin paired with Tether (USDT), a stablecoin pegged to the US dollar.

2. *BTC/USD*: Bitcoin paired directly with the US dollar.

3. *BTC/EUR*: Bitcoin paired with the Euro.

4. *BTC/ETH*: Bitcoin paired with Ethereum (ETH), another popular cryptocurrency.

5. *BTC/LTC*: Bitcoin paired with Litecoin (LTC), a peer-to-peer cryptocurrency.

6. *BTC/BCH*: Bitcoin paired with Bitcoin Cash (BCH), a fork of the Bitcoin blockchain.

7. *BTC/XRP*: Bitcoin paired with XRP (Ripple), a real-time gross settlement system (RTGS) for currency exchange and cross-border payments.

These pairs are available on various cryptocurrency exchanges, such as Binance, Coinbase, and Kraken.