Depositors — i.e. lenders — deposit their tokens into one or more vaults after choosing a fixed interest rate they want. Dependent on the activity in the vault they deposited, they will eventually be able to withdraw, or redeposit, exactly this percent rate of interest. The more active the vault, the faster the interest is earned.
On the other side, borrowers borrow from these vaults for a fixed duration at a fixed interest of their choosing. The interest is always paid in full regardless of when it is repaid. However, for every debt a borrower repays, the borrower is eligible to mint an amount of Kanpeki (KAE) tokens proportional to the value of their repaid debt and interest rate on it. Simply, the higher the interest rate and duration, the higher the KAE reward, even exceeding the value of the interest paid if choosing higher interest rates and durations.