Cryptocurrency exchanges that have over 1 billion in 24-hour spot trading volume on coinmarketcap and coingecko are:

Binance12 - the largest and most popular exchange in the world, offering over 400 cryptocurrencies and many additional services, such as staking, lending, futures, options and others.

Bybit12 - an exchange specializing in derivatives such as cryptocurrency futures and options.

Coinbase Exchange12 - one of the oldest and most renowned cryptocurrency exchanges, offering over 230 cryptocurrencies and the ability to trade with fiat currencies such as euro, dollar or pound.

These are the three largest cryptocurrency exchanges by 24-hour spot trading volume on both sites.