The risk rate of mortgage loans is related to the price of the loan. The price of the loan is determined by the WINk oracle, which is currently set at 0.00000619. The risk rate of a mortgage loan is then determined by the loan's price, as well as the borrower's credit score, the loan amount, and other factors. By understanding the risk rate of a mortgage loan, lenders can better assess the risk of a loan and determine if it is a good fit for their portfolio.