$BTC Nowadays, the most popular Bitcoin pairs mainly trade in USD and stablecoins like USDT. The classic BTC/USD remains king: lots of liquidity, reduced spreads, ideal for fast trading . Then we have BTC/USDT, which groups super high volumes and is practically the same but in Tether.

There are also pairs in other currencies: BTC/EUR, BTC/GBP, BTC/CAD, BTC/JPY… if you trade from Europe or the UK, it's advisable to look at those since you avoid conversions, but they usually trade less than the USD pair .

In summary: if you want action, head to BTC/USD or BTC/USDT. If you prefer to trade with your local currency, take a look at BTC/EUR or BTC/GBP. The key: look at volume, spread, and decide which pair fits best with your style and location.