A cryptocurrency fiat balance usually refers to money that a user can use to buy and sell cryptocurrencies on an exchange. Unlike a cryptocurrency balance, which shows the amount of a particular cryptocurrency a user has, a fiat balance shows the amount of money in a traditional national currency such as U.S. dollars, euros, yuan, etc.

To start trading on a cryptocurrency exchange, a user usually has to fund his fiat balance through a bank transfer or credit card. He can then use these funds to buy cryptocurrency at current prices on the exchange. When a user sells their cryptocurrency, the funds received will be credited to their fiat balance.

The fiat balance can also be used to withdraw money from the cryptocurrency exchange. If a user has sold his cryptocurrency and wants to withdraw the funds received to his bank account, he can request to withdraw the money to his fiat balance. This money will be transferred to the user's bank account after passing the verification procedure and confirming the transaction.

It is important to note that the fiat balance on a cryptocurrency exchange is not guaranteed by insurance as in the case of bank accounts. Users should be concerned about the safety of their money and choose reliable cryptocurrency exchanges to make sure that their funds are safe.