The fair annualized return of DeFi should be 12.55%.

Written by: Tom Dunleavy

Translated by: Chopper, Foresight News

KelpDAO suffered a $292 million cross-chain bridge attack, spreading risks to Aave, resulting in a total asset value locked in DeFi evaporating by $13 billion within 48 hours. If you deposit USDC in the money market earning only 5%, the real critical question is not whether DeFi has risks, but whether your returns match the risks taken. This article will break down this issue using bond pricing logic.

Two weeks ago, attackers stole $292 million from KelpDAO, and the stolen rsETH was subsequently redeposited into Aave V3 as collateral, directly causing Aave to incur approximately $196 million in bad debt. Within just three days, Aave's total assets locked plummeted from $26.4 billion to $17.9 billion. Prior to this, two weeks earlier, the Drift Protocol in the Solana ecosystem lost $285 million due to a social engineering attack on its admin private key by North Korean hackers, with the attack plan traceable to as early as autumn 2025.

The two major security incidents occurred just three weeks apart, cumulatively resulting in $577 million in losses. Due to risk-driven withdrawals, the USDC loan market utilization rate on Aave reached as high as 99.87% for four consecutive days, with deposit rates soaring to 12.4%. Gordon Liao, Chief Economist at Circle, even initiated a governance proposal to quadruple the loan cap to alleviate withdrawal demands.

A month ago, many users deposited stablecoins in the DeFi money market, earning a mere 4%–6% in annualized returns. Now everyone must confront a core question: is this kind of yield pricing reasonable in itself? A few weeks before the KelpDAO incident erupted, Santiago R Santos questioned on the Blockworks podcast: In DeFi, we endure high risks long-term without ever obtaining sufficient risk compensation. Moving forward, the reasonable risk premium for various assets should be redefined.

How Traditional Finance Prices Credit Risk

The yield of all corporate bonds consists of multiple layers of risk compensation. The core pricing formula is as follows:

Yield = Rf + [PD x LGD] + Risk Premium + Liquidity Premium

Rf is the risk-free rate, based on the yield of U.S. Treasury bonds that match the duration. PD x LGD represents expected loss = default probability x loss given default, with the loss given default defined as 1 - asset recovery rate. The risk premium compensates for the uncertainty beyond the expected loss; even if two assets have identical PD and LGD, pricing can still differ if the volatility range of risk outcomes varies. The liquidity premium refers to the additional costs of liquidating the asset at a discount or exiting a position.

Based on long-term historical data from Moody's since 1920, the benchmark is as follows:

• The long-term average default rate of U.S. speculative-grade bonds is 4.5%, with 3.2% over the past twelve months, expected to rise to 4.1% in Q1 2026;
• High-yield unsecured bonds have an average historical recovery rate of about 40%, corresponding to a loss given default rate of about 60%;
• Long-term annualized expected loss for high-yield bonds: 4.5% x 60% = 2.7%;
• In the private credit sector, KBRA predicts a 3.0% default rate for direct lending in 2026, with an average recovery rate of about 48% for default cases in 2023-2024;
• High-yield secured leveraged loans historically have a recovery rate range of 65%-75%.

Traditional Financial Yield Ladder for April 2026

Let's look at the current actual data. The 10-year U.S. Treasury bond closed last Wednesday with a yield of 4.29%. Simultaneously, data from April 2026 ICE Bank of America all credit options adjusted spread was extracted.

The pricing logic is clear and aligned with common sense: as it moves down the capital hierarchy from government bonds, investment-grade bonds, speculative-grade bonds, to subordinate commercial real estate assets, yields rise in parallel to compensate for the increasing probability of default and loss severity. The yield on private direct lending remains around 9%, not because the borrower's default rate is higher, but primarily due to the extremely poor liquidity of non-standard private assets, resulting in significant liquidity premiums.

In contrast, the DeFi market: before the KelpDAO incident, Aave's USDC deposit rate was around 5.5%, with a pricing level between investment-grade bonds and single B-rated high-yield bonds. Meanwhile, Morpho, relying on selected treasury and active management filtering, offers a yield of about 10.4%. These two figures cannot both accurately reflect the same potential risk.

Three Unique Default Patterns in DeFi Not Present in Traditional Finance

Traditional credit default processes are tedious. Borrowers fail to pay interest, bondholders trigger debt acceleration clauses, enterprise restructuring, asset liquidation, negotiation of asset recovery—all lengthy and negotiable processes.

However, DeFi lacks a debt restructuring mechanism, with threats primarily coming from protocol attacks divided into three completely different failure modes, each with unique loss characteristics.

Pattern One: Smart Contract Vulnerability Attacks

Code vulnerabilities lead to theft, such as reentrancy attacks, parameter validation failures, or lack of permission control. Attackers directly empty funds pools. Historical data shows that in protocol attacks where white hat hackers intervene, the average recovery rate of funds is only 5%–15%; if involving North Korean state-level hacker organizations, recovery rates tend to be close to zero. The $611 million in stolen funds from Poly Network in 2021 was fully returned, which is an extreme case; the $625 million and $325 million thefts from Ronin and Wormhole, respectively, ultimately recouped losses, entirely dependent on the project parties and market makers making up the shortfall, not a market-driven asset recovery, fundamentally representing shareholder compensation.

Pattern Two: Oracle Manipulation and Governance Attacks

Malicious manipulation of price feed data using low liquidity decentralized trading pools to artificially create bad debts; or attackers hoarding governance tokens, maliciously passing proposals to empty treasury funds. In 2022, Beanstalk suffered $182 million in losses due to a governance attack, which is a typical case. Although these risks can be partially mitigated through protocol interventions, the asset claims held by lenders often become worthless token holdings.

Pattern Three: Composability Chain Collapse

The KelpDAO incident falls into this category, representing the most dangerous and hardest-to-audit risk pattern. Protocol A issues liquid staking/re-staking derivatives, protocol B accepts that asset as collateral, and protocol C is responsible for cross-chain asset bridging. If any link in this entire chain is attacked, it will lead to a chain reaction of all downstream holdings collapsing. Attackers do not need to breach Aave itself; they only need to penetrate the upstream rsETH underlying protocol, which will directly subject Aave lenders to significant bad debt.

These three types of risk share a common characteristic, which is the core distinction between DeFi and traditional credit markets: risk events erupt on a minute-by-minute basis, not quarterly. There are no contract negotiations, no bankruptcy financing safety nets; smart contracts execute automatically, and the code is the rule. Once code vulnerabilities occur, losses are almost irreversible. Aave V3's rsETH bad debt skyrocketed from zero to $196 million within about four hours. In comparison, the median cycle for BB-rated traditional high-yield bonds from risk alert to debt restructuring lasts 14 months.

The Truth Revealed by Actual Loss Data

Chainalysis's mid-December 2025 report revealed a set of contradictory data: from early 2024 to October 2025, the total locked asset value in DeFi rebounded from $40 billion to a peak of $175 billion, but losses from DeFi-exclusive hacker attacks remained within the low range seen in 2023. The total value of stolen cryptocurrency for the entire year of 2025 is $3.4 billion, with risks highly concentrated in centralized exchanges being hacked and personal wallets being stolen.

Looking at this data alone, it’s easy to mistakenly assess that DeFi's safety level continues to improve. The objective truth does exist: the contract auditing industry is mature, platforms like Immunefi guarantee over $100 billion in user assets, and cross-chain bridges are gradually introducing time locks and multi-party verification mechanisms.

However, the reality in 2026 is entirely the opposite: on April 1, Drift lost $285 million, and on April 18, KelpDAO lost $292 million. Two major blast incidents within 18 days targeted composability architecture vulnerabilities rather than the lending protocols themselves.

Combining the average size of locked assets, we estimate recent annualized loss rates in DeFi:

• 2024: DeFi-specific losses of about $500 million, average lock of $75 billion → annualized loss rate of 0.67%
• 2025: losses of about $600 million, average lock of $120 billion → annualized loss rate of 0.50%
• In 2026 (annualized estimate): losses from just two incidents in Q2 reached $577 million, average lock of $95 billion → if risk trends continue, the annualized loss rate will reach 2.0%–2.5%

Based on this calculation, the forward annualized default probability for leading DeFi lending businesses is approximately 1.5%–2.0%. Considering a 90% default loss rate under extreme attacks (without any external backing, the usual recovery rate from theft is only 5%–15%), the annualized expected loss is 1.35%–1.80%. This value has surpassed traditional high-yield bonds, and does not yet account for uncertainty premiums, liquidity discounts, regulatory risks, or cross-chain composability contagion risks.

The Reasonable Risk Premium Model for DeFi

Based on bond pricing logic, we estimate the fair yield for leading DeFi stablecoin deposits: benchmarking against leading protocols on the Ethereum mainnet (Aave, Compound), fully collateralized with excess backing, aimed at retail and quantitative borrowers for USDC loan products.

Constructing fair value yield from the 10-year Treasury yield benchmark

Using the 10-year U.S. Treasury as the benchmark, we layer on premiums:

• Risk-free benchmark (10-year U.S. Treasury): +4.30%
• Expected fixed loss: +1.50%
• Oracle manipulation risk premium: +0.75%
• Governance/admin private key risk premium: +1.00%
• Cross-protocol composability chain risk (similar to Kelp): +1.25%
• Regulatory asymmetry risk premium: +1.25%
• Stablecoin de-pegging tail risk: +0.50%
• Asset liquidity premium: +0.50%
• Risk premium: +1.50%

Ultimately yielding a fair annualized return of: 12.55%.

Therefore, ideally, the reasonable interest rate for top compliant DeFi stablecoin deposits should not be lower than 13%. Assets that have insurance coverage and protocol reserve backing may have their interest rates moderately adjusted down; long-tail protocols, newly launched markets, and those involving re-staking and cross-chain underlying assets, require a higher risk premium.

Conclusion

First, strive for fair compensation. If you offer USDC to DeFi at a 5% yield, you are effectively accepting BB-rated credit risk pricing, while its technological and composability risks are actually higher than those of CCC-rated assets. The Morpho-style curated treasury market, with yields between 9% and 12%, is closer to a fair yield, but it also raises questions regarding manager selection and transparency.

Second, enhance the capital structure. Excessive loans backed by high-quality collateral (ETH, wBTC, seasoned LST), supplemented with oracle redundancy and protocol-level insurance, and not involving cross-chain risks, have a much lower risk premium than the aforementioned framework. These fall under the category of “investment-grade assets” in DeFi.

Third, correctly assess tail risks. The KelpDAO vulnerability is not a black swan event, but rather a foreseeable fault pattern in the re-staking primitives connected to an increasingly fragile multi-chain architecture. The situation with Drift is similar, just with different participants. The second quarter of 2026 recorded a permanent loss of $577 million. A DeFi investment portfolio with a yield of 5.5% completely fails to cover the risks of extreme crashes and chain explosions.

DeFi is not uninvestable; it is merely mispriced currently. There are indeed institutional-level allocation opportunities, but the precondition is that funders either demand a reasonable premium that matches the risks or conduct thorough due diligence on a single protocol to the rigorous standards of private credit. Simply mindlessly depositing into leading monetary markets and passively accepting low yields is merely a high-risk arbitrage masquerading as low-risk wealth management.