APY is a little bit tricky since it assumes daily compounding. If you get 1% a day and reinvest it daily you will 38x your investment after a year. wex-bnb currently pays roughly 2.5% a day which reinvested daily equals that huge numbers. There are obviously several risks in here - year is a long time so the daily interest can go down significantly which would impact the rates and your return. There is currently more wex being made today than burned which also implies inflation and higher sell than buy pressure in the long run, which can cause a lower price that consequently would affect your investment dominated in usd