How does DeFi balance risk and gain
Author:Tom Dunleavy
Other Organiser
The $292 million cross-chain bridge gap on KelpDAO triggered a chain reaction through Aave, draining DeFi's $13 billion TVL within 48 hours。
If you earn 5 per cent of the USDC gains in the money market, the question is not whether DeFi is at risk, but whether the risks you take are rewarded. Let's use bond math to solve this problem。
Two weeks ago, the attackers stole $292 million from KelpDAO through the damaged Layer Zero cross-link bridge. The stolen rsETH was subsequently re-encumbered in Aave V3, leaving some $196 million in bad debts on Aave ' s balance sheet, and TVL fell sharply from $26.4 billion to $17.9 billion in three days。
Two weeks ago, Solana ' s Drift agreement lost $285 million due to the leaking of North Korean hackers ' key keys, a social engineering attack that was planned since autumn 2025。
In a three-week hiatus, the total permanent loss from the two incidents was $577 million. The USDC market in Aave has reached 99.87 per cent capital utilization for four consecutive days, with borrowing rates soaring to 12.4 per cent. The chief economist, Gordon Liao, submitted a governance proposal calling for a fourfold increase in the borrowing ceiling to clean up the line of withdrawals。
For those who provided stable currencies to the DeFi currency market at rates of 4 to 6 per cent a month ago, a question is most important: have these rates been reasonable
Whether we have been adequately compensated for the risks we have taken in DeFi and where future spreads should be set is worth exploring in depth。
How traditional finance is priced for risk
The return on each corporate bond is a premium on risk compensation. This is the core formula:
Rate of return = Rf + [PD x LGD] + risk premium + liquidity premium
Rf is a risk-free rate, based on a fixed-term national debt. PD x LGD is the expected loss: the probability of default multiplied by the default loss rate and LGD equals 1 less recovery rate。
THE RISK PREMIUM COMPENSATES FOR THE UNCERTAINTY OF THE EXPECTED LOSSES — THE TWO BOND PDS AND LGDS ARE IDENTICAL, BUT THE ONE WITH THE GREATER VOLATILITY OF THE POTENTIAL OUTCOME IS STILL SUBJECT TO HIGHER PRICING. THE LIQUIDITY PREMIUM COMPENSATES FOR THE COST OF EXIT。
Moody's long-term data since 1920 gives anchor points:
THE SPECULATIVE CLASS DEFAULT RATE IN THE UNITED STATES, WITH A LONG-TERM AVERAGE OF 4.5 PER CENT PER ANNUM, IS CURRENTLY 3.2 PER CENT FOR 12 MONTHS AND IS EXPECTED TO RISE TO 4.1 PER CENT IN THE FIRST QUARTER OF 2026. THE RECOVERY RATE OF UNGUARANTEED HIGH-YIELD BONDS HAS HISTORICALLY BEEN CONCENTRATED AROUND 40 PER CENT AND LGD ABOUT 60 PER CENT, AND THE EXPECTED LOSS ON HIGH-YIELD DEBT IS 2.7 PER CENT PER ANNUM IN THE LONG-TERM AVERAGE。
WITH REGARD TO PRIVATE LOANS, KBRA PROJECTS A DIRECT LOAN DEFAULT RATE OF 3.0 PER CENT AND A RECOVERY RATE OF ABOUT 48 PER CENT IN 2026. THE HISTORICAL RECOVERY RATE FOR PRIORITY SECURED LEVERAGE LOANS RANGED FROM 65 TO 75 PER CENT。
What's the rate of return in today's market
Look at the actual data today. The 10-year national debt was collected on Wednesday at 4.29 per cent. As of April 2026, ICE BofA credit bank options spreads (scales measuring the risk of a bond being higher than the national debt) showed:
The pattern is intuitive. From the level of government bonds to the level of investment, to the level of speculation, and finally to the level of sub-business real estate, the rate of return has risen step by step to compensate for the increased probability of default and the severity of the loss。
The return on direct loans was around 9 per cent, not because of higher default rates on the part of lower-level borrowers, but because the liquidity premium for holding non-liquid private instruments was real and visible。
Now look at the position of Aave's USDC rate before the Kelp incident — about 5.5 per cent — between investment-grade and single-B high-yield bonds。
Morpho brings together a selected management vault with a return of around 10.4 per cent. It is not possible for both figures to be accompanied by a correct valuation of the same potential risks。
DeFi, there are three kinds of "failures" not in traditional finance
Traditional credit defaults are boring: the borrower pays no interest, the bond holder triggers an accelerated settlement, followed by reorganization, sale of assets, and recovery amounts negotiated。
DeFi does not have the asset disposal process, and it faces a loophole. There are three distinct patterns of failure:
Mode 1. Smart contractual gaps
The code is defective: re-entry loophole, input validation error, access control is missing. The attackers drained the pool. The historical recovery rate of agreements directly attacked was between 5 and 15 per cent in the case of the return of white hat hackers, and zero in the case of Korean hackers。
PolyNetwork returned all $611 million to the 2021 attackers, somehow acting like a sport. Ronin's $625 million and Wormhole's $325 million were recovered because Sky Mavis and Jump Trading used their balance sheets separately — this was not asset recovery, it was shareholder rescue。
Mode 2. Prophecy manipulation and governance attacks
Price feeds are destroyed, usually by manipulating the thinly mobile DEX pool, with which bad debts arise. Or the attackers accumulate governance coins and drain the vault through malicious proposals. Beanstalk thus lost $182 million in 2022。
Such attacks can usually be partially reversed through agreement-level interventions, but lenders' claims for "assets" often end up being claims for worthless tokens。
Mode 3. Portable cascade effects Response
This is the failure model of KelpDAO and the most dangerous because it is the most difficult to audit. Agreement A issues a pledge or re-carrying token of a mobile nature, which is accepted as collateral by Agreement B, and Agreement C links its bridge to another chain. A loophole in any link of the chain makes the downstream position an orphan。
The attackers did not have to break Aave, they broke rsETH and Aave's lender incurred bad debts。
These three models have one thing in common, and it is where DeFi is distinguished from all traditional credit markets: when problems arise, they erupt within a few minutes, not a few quarters。
THERE IS NO CONTRACT RENEGOTIATION, NO DIP FINANCING (INSOLVENCY RESTRUCTURING FINANCING, NEW FINANCING OBTAINED DURING ENTERPRISE INSOLVENCY PROTECTION, TO SUSTAIN OPERATIONS UNTIL REORGANIZATION IS COMPLETED, WITH A PREFERENTIAL RIGHT TO REPAYMENT) AND DIRECT EXECUTION OF SMART CONTRACTS。
Code is law - when the code is wrong, the loss is almost devastating。
The rsETH bad debt on Aave V3 jumped from zero to $196 million in just four hours. By contrast, the median BB-class default took 14 months from the first pressure signal to completion of the reorganization。
Data says DeFi is safe? It's not that simple
Traditional narratives are starting to stand up here. Chainalysis recorded an alarming disagreement in its mid-December 2025 update: despite the recovery of DeFi’s TVL from $40 billion at the beginning of 2024 to about $175 billion at its peak in October 2025, DeFi’s particular hacker losses remained near the low point of 2023。
In 2025, a total of $3.4 billion in encrypted currency thefts were concentrated on the centralized exchange loopholes (the Bybits alone accounted for $1.5 billion) and personal wallet leaks (44 per cent of the total stolen value, up from 7 per cent in 2022)。
Source: Chainalysis Reports of Encrypted Currency Crime 2025 and 2026
If you only look at chart 02, you'll come to the conclusion that DeFi is becoming safer. This is true: smart contract audits have matured, leaky reward schemes like Immunefi now protect over $100 billion in user funds, and cross-link structures are slowly using time locks and multiple validations。
But the 2026 record tells a different story. Drift lost $285 million on 1 April, KelpDAO lost $292 million on 18 April, and two nine-digit loss events within 18 days, both in response to the portfolio weaknesses, while non-core lending was in the bottom line。
The annualized loss rate for DeFi in recent years relative to the average TVL is about:
2024: DeFi-specific losses of approximately $500 million, with an average TVL of $75 billion = annual loss rate of 0.67 per cent
2025: DeFi-specific losses of approximately $600 million, with an average TVL of $120 billion = annual loss rate of 0.50 per cent
EARLY 2026 TO DATE (ANNUALIZED): SINGLE INCIDENT LOSSES OF APPROXIMATELY $577 MILLION IN THE SECOND QUARTER ONLY, AND $95 BILLION IN TVL = POTENTIAL ANNUAL LOSS RATES OF BETWEEN 2.0 PER CENT AND 2.5 PER CENT IF THIS PACE CONTINUES
Assuming a high-quality DeFi borrowing with a long-term default probability (PD) of 1.5 to 2.0 per cent, a default loss rate of 90 per cent (LGD) has been applied - an average recovery rate of 5 to 15 per cent for the direct loophole when there is no external balance sheet willing to go to the bottom - an expected loss of 1.35 to 1.8 per cent per annum。
This is higher than high-yield bonds. Uncertainty, non-mobility, regulatory asymmetries, and the premium of a combination of infectious disease-specific structures have not been included。
DeFi, what's the rate of return
This is where bond math really works. I'm going to price the fair rate of return on the supposed high-quality DeFi stable currency deposits. - In the case of retail and quantitative borrowers on the Internet, over-pricing positions on Aave or Common by USDC。
A fair value rate of return is built upwards from the 10-year benchmark of sovereign debt. The framework follows Duffie-Singleton credit spreads and has been adapted to the specific failure model of DeFi。
Detailed components:
Risk constitutes a premium-free benchmark (United States Treasury debt for 10 years) + 4.30% expected loss (risk of default x loss rate) + 1.50% predictive machine manipulation risk + 0.75% governance / Manager key risk + 1.00% cross-chain cascade risk (type Kelp event) + 1.25% regulatory asymmetric risk + 1.25% stable currency debarment risk + 0.50% liquidity premium + 0.50% model uncertainty premium + 1.50% =Lower reasonable rate of return12.55%
Therefore, for high-quality DeFi stable currency deposits in mainstream agreements, the interest rate floor should not be below 13 per cent. The position with clear insurance coverage (Nexus Mutual coverage, Umbrella-type agreement reserve) can be slightly lower, with higher exposures for long-tail agreements, newly deployed markets or re-commitments, and cross-chain base agreements。
Core conclusions
First, fair compensation is required。If you provide USDC to DeFi at an interest rate of 5 per cent, you are actually pricing BB-class credit risk and taking a worse technology and portfolio risk than the CCC level。
The best-selected vault market, the Morpho, had rates of return of 9 to 12 per cent closer to fair clearing prices, although it also raised its own questions about manager selection and transparency。
Second, to a capital bank (from preferential secured debt to ordinary equity)The higher the reward, the smaller the risk) Move above。
Over-pricing loans for blue collateral (ETH, wBTC, long-tested LST) have predictive redundancy, agreement layers, and no cross-chain openings — this is the real investment grade of DeFi, whose risk premium would be significantly lower than the above-mentioned framework estimates。
Third, the end risk is properly priced。
The KelpDAO loophole is not a black swan; it is a foreseeable failure model of an increasingly fragile multi-chain architecture intermediate bridge pledge base agreement. Drift is the same story, just changed the lead。
Permanent losses of $577 million had already been incurred in the second quarter of 2026, and a mixed DeFi portfolio with a 5.5 per cent return risk of a catastrophic rollback that could not be compensated。
DeFi was not uninvestable, but had been erroneously priced at the top of the order book. The agency ' s opportunities are real, but are limited to those who either require a risk premium supported by the framework or assess the same degree of rigour as private lending to look at a specific agreement ' s asset configuration。
The most economical way of depositing a stable currency on a mainstream lending platform and passively accepting the published rate of return is simply a bet in a no-risk-interest suit。
