Coinbase has rolled out fixed-rate USDC loans backed by Bitcoin, but the real shift isn’t the interest rate, it’s the built-in maturity date. Borrowers now lock in both the rate and the final repayment deadline when they originate the loan, and that’s a structural difference from Coinbase’s earlier variable-rate crypto-backed offerings. The core risk moves beyond just Bitcoin’s price. If the loan isn’t paid back in full by maturity, the collateral becomes eligible for liquidation, even if loan-to-value is otherwise healthy at the deadline.
Mechanically, users post Bitcoin, which Coinbase converts to cbBTC and deposits into a Morpho Midnight smart contract. Borrowers get USDC up front, and have to repay everything by the agreed date. The more familiar route, automatic liquidation for falling below the 86% loan-to-value ratio, still applies, but there’s also a timeline-driven trigger tied to maturity.
What’s critical is that this isn’t only about a sudden intraday crash in Bitcoin. The loan could still be healthy by collateral standard and yet become eligible for liquidation if time runs out, which is the edge case critics are flagging now. That means the repayment deadline matters as much as the asset price, shifting the focus for borrowers who may be used to open repayment windows. It’s a test of whether users adapt to a harder clock as the main risk mark, not just volatility.