Alchemix vs Aave

How borrowing works on Aave versus Alchemix

Aave is a money market: suppliers deposit assets that borrowers can draw against, and borrowers pay variable interest that is distributed to suppliers as their yield. A borrower on Aave can typically borrow a different asset than the one they deposited, for example supplying ETH and borrowing a stablecoin, and must maintain a health factor above a required threshold or risk liquidation.

Alchemix does not pool user deposits for other users to borrow. It mints a synthetic token — alUSD or alETH — against a share of the depositor's own collateral, and that synthetic token is what represents the debt. There is no separate lender being paid interest, because the protocol is not intermediating between a supplier and a borrower in the way Aave does.

Interest and cost: variable rates versus none

On Aave, borrowing cost floats with utilisation: as more of a given asset's supply is borrowed, the rate rises, and a borrower must monitor and budget for a rate that can change materially over the life of a position. This gives Aave borrowers flexibility to repay on their own schedule but adds an ongoing cost and a variable to track.

Alchemix removes interest entirely. Instead, the depositor's own yield is redirected toward closing the debt automatically, which functions as a form of pre-payment funded by the collateral's productivity rather than a recurring expense charged by a lender.

• Aave: variable interest rate, borrow any listed asset against collateral
• Alchemix: no interest, debt is a synthetic of the deposited asset
• Aave: liquidation if health factor falls below the required threshold
• Alchemix: no ordinary price-driven liquidation, repayment funded by yield

Liquidation risk: active monitoring versus structural avoidance

Liquidation is the central risk a borrower manages on Aave. Because the borrowed asset and the collateral asset are typically different, their relative price can move against the borrower, and a sharp enough move triggers a forced sale of collateral along with a penalty. Managing this well requires either a conservative loan-to-value or active attention during volatile markets.

Alchemix avoids this specific risk by denominating debt in a synthetic version of the same collateral that was deposited, so the two move together rather than diverging. This does not mean an Alchemix position is risk-free — smart contract failure and yield strategy underperformance remain real exposures — but the everyday anxiety of monitoring a health factor during a market swing does not apply in the same way.

When Aave fits better and when Alchemix fits better

Aave's flexibility makes it the better tool when a borrower needs a specific different asset, wants to repay quickly, or is managing a short-term, actively monitored position where a competitive variable rate can beat the opportunity cost of Alchemix's more conservative borrowing limits. Its broader asset listings and deeper liquidity for many pairs also matter for larger or more varied positions.

Alchemix fits better for a long-term holder who wants liquidity against an asset they intend to keep for years, has no interest in actively managing a health factor, and is comfortable with a narrower choice of what can be borrowed in exchange for a loan that requires essentially no ongoing management once sized sensibly.