4.5 yuan. At the end of 2023, "Borrowing Bai" was renamed as a credit loan, which was a loan service launched by Alipay. According to different sesame scores, users can apply for different loan quotas. The longest repayment period of the loan is 12 months, and the daily interest rate of the loan is 0.045%, so the daily interest rate of the loan is 1 0,000× 0.045% = 4.5, so the daily interest rate of the loan is 4.5 yuan.