Compound review

Compound is one of the two protocols, alongside Aave, that defined DeFi lending. Launched in 2017 by Compound Labs in San Francisco, it popularized algorithmic, utilization-based interest rates and was the protocol that kicked off 'yield farming' in 2020 with its COMP governance-token distribution.

The current version, Compound III (codenamed Comet), is a deliberate simplification of the original pooled design. Each Comet market has a single borrowable base asset — typically a stablecoin like USDC — and a defined set of collateral assets. You supply ETH, WBTC, wstETH or other approved collateral and borrow only that one base asset, which isolates risk per market and keeps the contracts lean.

Compound III is deployed on Ethereum, Base, Arbitrum, Polygon and other chains. It supports account abstraction and has consistently offered some of the lowest stablecoin borrow rates in DeFi, making it a favourite of conservative borrowers who want a simpler, narrower surface area than Aave.

Borrowing on Compound III is fast and self-custodial. Connect a wallet such as MetaMask or a hardware wallet to the Compound app and pick a market — for instance, the USDC market on Base.

Supply approved collateral (ETH, WBTC, wstETH, and similar) to that market. Unlike a classic pool, collateral in Compound III does not itself earn interest; its job is purely to back your borrow. The app shows your borrowing capacity from each collateral asset's collateral factor.

Borrow the market's base asset — the stablecoin — up to your limit, and it lands in your wallet immediately. Repayment is open-ended: pay back any amount whenever you like, with interest accruing per block. If your borrow position approaches the liquidation threshold you can be liquidated, so most borrowers keep a comfortable buffer below the maximum.

Compound III rates are algorithmic and utilization-driven, like Aave's, but each market prices only its single base asset. Borrow APR rises as more of the supplied base asset is borrowed, following a kinked curve, so quiet markets are cheap and heavily utilized ones get expensive.

In practice Compound has been one of the cheapest places to borrow stablecoins in DeFi — observed stablecoin borrow APRs commonly sit around 2.7–3.4% and rise toward 6% under heavy demand. Because you can only borrow the base asset, there is no rate surprise from borrowing exotic assets; the curve is simple and transparent.

The best rates come from borrowing on a low-utilization market and on a cheaper L2 like Base or Arbitrum, where gas is a fraction of Ethereum mainnet. COMP rewards, where active, can further offset the effective borrow cost.

Compound is non-custodial: collateral lives in smart contracts you alone control, with no company custody and no rehypothecation. Compound III's single-base-asset design is intentionally minimal, which shrinks the attack surface relative to a multi-asset pool.

The contracts have been audited by OpenZeppelin, Trail of Bits, and ChainSecurity, and Compound has operated since 2017. Its main historical incident was a 2021 governance/distribution bug in a COMP rewards contract that mistakenly over-distributed tokens — a token-distribution error, not a loss of user collateral. User funds were not stolen.

As with any DeFi protocol, the live risks are liquidation during sharp price moves and residual smart-contract risk. The conservative, narrow design of Compound III is a point in its favour for risk-averse borrowers.

Compound suits the conservative DeFi borrower who wants the simplest possible money market: supply blue-chip collateral, borrow a stablecoin, and not think about a sprawling list of assets or rate modes. It is ideal for someone borrowing USDC against ETH or WBTC who values low, transparent rates and a lean, audited codebase.

It is less suitable if you need to borrow many different assets, want the highest possible LTV or capital efficiency, or need fiat and CeFi-style support. Those users are better served by Aave (breadth), Morpho (efficiency), or a CeFi lender.

Compound earns 8/10 as a disciplined, well-audited, low-rate stablecoin borrowing venue. Compound III's single-base-asset markets trade breadth for simplicity and safety, and its stablecoin borrow rates are among the lowest in DeFi. It loses a point to Aave on asset selection and features, and to Morpho on raw capital efficiency. Skip Compound if you need to borrow a wide range of assets or want a CeFi-style fixed rate.