TL;DR
- Aave V4 leads in TVL and multi-chain reach, with approximately $22 billion locked across 12 networks and consistently competitive supply rates for major assets.
- Compound III offers the simplest risk model by isolating each market to a single base asset, reducing cross-collateral contagion risk at the cost of capital efficiency.
- MakerDAO (now Sky) generates yield through real-world asset integration, offering a differentiated risk profile that blends DeFi mechanics with traditional credit exposure.
Why DeFi Lending Matters
Decentralized lending protocols have become the backbone of the DeFi ecosystem, facilitating billions of dollars in borrowing and lending activity without traditional financial intermediaries. These protocols allow users to earn yield on deposited assets and borrow against crypto collateral, all governed by smart contracts and on-chain governance.
The three dominant protocols, Aave, Compound, and MakerDAO (rebranded as Sky in 2024), represent distinct approaches to decentralized lending. Each carries a unique risk-return profile that investors should understand before committing capital.
Protocol Comparison Table
| Feature | Aave V4 | Compound III | MakerDAO / Sky |
|---|---|---|---|
| TVL | ~$22B | ~$5B | ~$12B |
| Chains Supported | 12+ (Ethereum, Arbitrum, Polygon, Base, etc.) | 5 (Ethereum, Arbitrum, Polygon, Base, Optimism) | Ethereum (primary) |
| Supply APY (USDC) | 3.8% - 5.2% | 3.5% - 4.8% | 5.0% - 8.0% (DSR) |
| Borrow APY (USDC) | 4.5% - 6.5% | 4.2% - 6.0% | N/A (issues DAI) |
| Governance Token | AAVE | COMP | MKR / SKY |
| Security Incidents | Minor (flash loan exploits on isolated markets, no mainnet loss since 2022) | None on Compound III | Oracle manipulation in 2020 (resolved) |
| Audit Firms | Certora, Trail of Bits, SigmaPrime | OpenZeppelin, Chainsecurity | Chainsecurity, ABDK |
| Risk Model | Cross-collateral with isolation mode | Single-base-asset isolation | Overcollateralized CDP |
Aave V4: The Multi-Chain Heavyweight
Aave is the largest DeFi lending protocol by TVL, with approximately $22 billion in deposits spread across Ethereum mainnet and 11 Layer 2 and alternative chain deployments. Aave V4, launched in early 2026, introduced several architectural improvements over its predecessor, including a unified liquidity layer that allows capital to flow between chains.
Supply rates on Aave fluctuate based on utilization. For USDC and USDT, lenders typically earn between 3.8% and 5.2% APY, while ETH and WBTC supply rates range from 1.5% to 3.0%. Borrowing rates follow a kinked interest rate curve that escalates sharply once utilization exceeds 80%, incentivizing repayment during high-demand periods.
Aave's risk management relies on a combination of liquidation mechanisms, isolation mode for riskier assets, and a Safety Module funded by staked AAVE tokens. The Safety Module currently holds approximately $500 million in staked AAVE, serving as a backstop against protocol losses. In 2025, Aave processed over $2 billion in liquidations without any bad debt events on mainnet, demonstrating the robustness of its liquidation engine.
The protocol's governance, managed by AAVE token holders, has been active and responsive. Recent governance proposals have added support for new collateral types, adjusted risk parameters, and allocated treasury funds to security audits. Aave's revenue sharing mechanism distributes a portion of protocol fees to AAVE stakers, providing a tangible return on governance participation.
Compound III: Simplicity as a Feature
Compound III (also called Comet) represents a philosophical departure from the pooled-risk model that earlier DeFi lending protocols used. Each Compound III market has a single borrowable "base asset" (typically USDC), and users can only borrow that base asset against a defined set of collateral types. This isolation prevents a scenario where a depeg or exploit in one collateral asset cascades into losses for lenders of unrelated assets.
The trade-off is reduced capital efficiency. In Aave, a user can deposit ETH and borrow USDC, DAI, or any other supported asset. In Compound III, the same user can only borrow USDC against their ETH collateral in the USDC market. This simplicity appeals to institutional users who prioritize risk containment over flexibility.
Compound III's TVL stands at roughly $5 billion, substantially below Aave's, reflecting its narrower feature set and more conservative expansion strategy. Supply rates for USDC hover between 3.5% and 4.8%, slightly below Aave's due to lower utilization ratios.
Compound's security record on its V3 architecture is clean, with no reported exploits or bad debt events since launch. The protocol underwent extensive audits by OpenZeppelin and Chainsecurity before deployment. Compound Labs, the development company behind the protocol, has progressively decentralized governance to COMP token holders, though the team retains significant influence over technical decisions.
MakerDAO / Sky: Real-World Yields in DeFi
MakerDAO, which rebranded to Sky in 2024, operates fundamentally differently from Aave and Compound. Rather than matching lenders and borrowers, Maker allows users to lock collateral in "Vaults" and mint DAI (now also USDS) stablecoins against it. The protocol earns revenue through stability fees charged to vault owners.
Maker's TVL of approximately $12 billion includes a unique asset mix. Roughly 40% of DAI backing comes from real-world assets (RWAs), including US Treasury bills held through entities like BlockTower Credit and Monetalis Clydesdale. This RWA integration generates consistent yield that funds the Dai Savings Rate (DSR), currently set between 5.0% and 8.0% depending on governance decisions.
The DSR is the primary yield mechanism for passive MakerDAO participants. By depositing DAI into the DSR contract, users earn yield funded by stability fees and RWA income. This rate has been among the highest in DeFi for stablecoin deposits, though it carries exposure to RWA credit risk that pure on-chain protocols avoid.
Maker's governance history includes a significant stress event: the "Black Thursday" liquidation crisis in March 2020, where rapid ETH price declines overwhelmed the auction system and created approximately $6 million in bad debt. The protocol has since implemented emergency shutdown mechanisms, improved oracle systems, and diversified its collateral base to mitigate similar risks.
Risk Assessment: What Could Go Wrong
Each protocol carries distinct risk vectors. For Aave, the primary concern is cross-collateral contagion. A sharp depeg in a supported asset (such as a liquid staking token like stETH) could cascade into liquidation failures and bad debt across multiple markets. Aave's isolation mode mitigates this for newer assets, but legacy markets retain pooled risk.
Compound III's risk is concentrated in smart contract vulnerability. Because the protocol's architecture is simpler, the attack surface is smaller, but a critical bug in the Comet contract could affect all markets simultaneously.
MakerDAO's RWA exposure introduces traditional credit risk into a DeFi context. If a RWA counterparty defaults or regulatory action freezes RWA assets, the protocol could face a shortfall in DAI backing. This is a fundamentally different risk category from the smart contract and oracle risks that purely on-chain protocols face.
All three protocols share common risks: oracle manipulation, governance attacks (where an entity acquires enough tokens to pass malicious proposals), and smart contract vulnerabilities in underlying dependencies (such as the EVM itself). Users should diversify across protocols and limit exposure relative to their total portfolio.
What This Means for Investors
DeFi lending offers yields that exceed traditional fixed-income instruments, but the risk profiles are qualitatively different. The 4-6% yields available on stablecoin deposits in these protocols come with smart contract risk, regulatory risk, and platform-specific risks that traditional savings accounts do not carry.
For conservative DeFi participants, Compound III's isolated market structure offers the most predictable risk model. Aave provides better yields and flexibility for users comfortable with pooled risk. MakerDAO's DSR appeals to those seeking higher yields and willing to accept RWA credit exposure.
The optimal strategy for most users involves diversifying deposits across at least two protocols, using only audited and battle-tested markets, and maintaining a portion of stablecoin holdings in self-custody as a risk buffer. Monitor governance proposals actively, as parameter changes (interest rate curves, collateral factors, liquidation thresholds) directly impact both yields and risk exposure.
Disclaimer: This article is for informational purposes only and does not constitute financial advice. Always consult a qualified financial advisor before making investment decisions.
