If you are a Metamask crypto wallet user, now you can buy crypto and sell crypto with fiat money and even withdraw to a bank account or via PayPal. Although currently only running in the US, UK and some European countries, there are plans to expand to other regions in the near future. But PayPal can be done for all countries. So for now Metamask wallet users can convert Ethereum into USD, GBP and EUR, which can then be withdrawn to the user's bank account. Metamask users who will try to convert Ethererum to Fiat money or vice versa must connect the Metamask wallet with the Metamask Portfolio (dApps).