The Secure Asset Fund for Users (SAFU) is an emergency insurance fund that was established by Binance in July 2018 to protect users' interests. When the fund was established, Binance committed a percentage of trading fees in order to grow it to a sizeable level to safeguard users interests.
The Secure Asset Fund was valued at US$1 billion based on the opening price on January 29, 2022. The value of the fund will fluctuate based on the market. The Fund can be viewed in two wallet addresses and comprises BNB, BUSD and BTC. The wallet addresses are here and here.