it depends on your country, which exchanges are available for you. Also check what kind of platform you use. When you use capital.com, I guess these are probably CFD, and not real crypto…. In many cases this will translate to these high spreads, I suppose. So I would recommend one if the larger centralized crypto exchanges like binance or bybit. My own favorite is bybit, as they offer options too, and many other benefits.

There’s no broker. There’s exchange.
I’d suggest using ByBit – they’re good.