Treating floating quotes as a long-term total price is the most commonly underestimated cost in borrowing. The numbers on the opening page look so specific that they can create the illusion that the contract has already been priced. But once the interest rate moves with market utilization, that number only describes the present—it cannot guarantee the next few weeks or months.

After Trustless Bitcoin Vaults (TBV) with @BabylonLabs_io integrates native BTC collateral into Aave v4, the borrowing interest rate is still determined by Aave Hub’s corresponding asset utilization. The tighter liquidity is in the market, the more the rate may change. Interest is also accrued into the debt continuously as Ethereum blocks progress. Native BTC provides the collateral entry point, but it does not lock borrowing costs.

The most direct impact for users is that budgeting cannot only copy the rate at the moment you open the position. The repayment plan needs room for volatility and must be re-estimated based on the borrowing duration as well. The longer the borrowing period, the more important this re-estimation becomes.

Users should focus not only on whether they can borrow today, but also on whether they can still repay according to the original plan after interest rates change. I think of it like an electricity tariff that fluctuates with load. Plugging in means you can use power, but it does not mean every kilowatt-hour going forward will be settled at today’s rate. When discussing capital efficiency in #baby , say one less thing about something being naturally cheap, and explain instead how the costs change—that will get you closer to how it actually works.

Capital efficiency gives an asset more use cases, while dynamic costs require ongoing management by the user—not putting the calculator away after opening the position. In the discussion around $BABY , if you only emphasize that native BTC can finally be borrowed without explaining how costs are re-estimated, users still only receive half the information. The only app currently registered is Aave v4, and the borrowed assets are also mock assets from a public testnet with no real value.

What we can confirm here is the interest rate mechanism, not how much any specific real account will ultimately pay. Innovation at the entry point is important, but budget discipline is equally non-negotiable. My view is straightforward: the opening interest rate is just the starting point, not a quote for the entire borrowing period.