The $15MM amount is far too large for an unaudited contract.
Another concern I have is just who would be the lender of this? Yes, the program as designed is secured lending, but a more aggressive underwriting than traditional margined loans. The rates in this type of lending should be significantly higher than a traditional margin loan given the risk to the lender. If the collateral loses significant value or goes to zero, the borrower has no incentive to repay. The use case would be short term - overnight lending or for flash loans.
When would interest on the loan be payable? P&I due at maturity is risky for the lender.
in short, I would be open but only to a much smaller amount given both the contract and credit risks.