Coinbase is a platform for trading and investing that makes users exchange, sell, and buy over 200 cryptocurrencies such as Dogecoin, Ethereum, Bitcoin, and many more. Coinbase.com is available both as a Coinbase app and as a browser extension.support.Coinbase.com is available both as a Coinbase app and as a browser extension. This is a guide that will give you all the important details of Coinbase that one should be aware of.