Written by: Thejaswini M A
Compiled by: Block unicorn
The most expensive thing placed before people is a decision. In comparison, various fees are trivial. People pay merely for convenience and ease, nothing more.
This is how platforms exploit users—they strip them of their choices. 'Couch Lock'—this is my favorite term mentioned by Tim Wu in his book "The Age of Extortion."
Can't choose stocks? Of course you can, index funds, S&P 500 index funds...
Not quite sure if you should lend. Let's just call it a savings account, and you'll be proud.
They just charge a removal fee. It removes not just the decision-making power, sometimes the best benefits too. People simply don't care.
The role of DeFi is to add value. But which chain, which liquidity pool, what fee rate, when to migrate, where's the bridge? Is it really Aave? Or something Claude Fable cooked up before July 12th? Aave has 2.5 million users and has been operating for six years. Revolut has 65 million users. Is it fair to say Aave must be smarter?
From January to July, the interest rate for Aave's USDC pool fluctuated between 2% and 9%.
In the DeFi space, price volatility is the norm. You watch prices rise and fall, and move your funds at the right moment.
But this structure simply doesn't work elsewhere. Neobanks can't explain to users that interest rates are determined by borrowing demand, and that rates might plummet to 2% while advertising a savings account. People won't put money into chaotic environments. That's why people never use crypto apps daily, let alone crypto savings apps.
On July 9th, Aave Labs discovered a workaround called Stable Vault. Today, I want to show you how it works, who profits from it, and why I think ordinary users will ultimately use it.
Stable Vaults allow any business to start offering savings account services with just one integration. It could be a neobank, an e-wallet, or a payroll processing platform. Deposits go directly into Aave's lending market. Users can view the interest rate in the app they use daily; if the rate is good, they'll open an account.
The interest rate is fixed. I know in the crypto world, that's hard to say out loud.
Aave's market pays the borrower's repayment amount for the week. Stable Vaults sit on top of it and provide operators with a dial. The app inputs a number, say 4%. From that moment, the vault pays a 4% yield per second, regardless of what Aave does underneath. That's the app's problem, not yours. Any excess yield generated by the strategy beyond that number goes to the operator.
Perspective: The Person Putting in Money
They all come with rate insurance. This spring, Aave's USDC pool paid a 2% premium, while a vault promising 4% still paid 4%, with the operator covering the difference.
Anywhere else, transferring risk comes at a cost, and here is no exception. Take fixed-rate mortgages, for example—they cost 50 to 100 basis points more than variable-rate mortgages, and that premium is essentially the fee the borrower pays for the fixed rate.
Users don't need to create a wallet, save a seed phrase, build a bridge, or choose a blockchain. They get a support hotline, account recovery, Face ID, and an address provided by the company (in case something goes wrong). Aave's app is SOC 2 certified and supports two-factor authentication (2FA), and promotes both because that's exactly the product or service customers are buying.
Users lose out on the upper side. When the pool pays 9%, they only get 4%; when it pays 6%, they still only get 4%. It's a fixed rate set by the app based on user tier. A dynamic rate is the live data you can actively monitor; a fixed rate completely hides the intermediary's cut.
Users also choose a second counterparty. With this setup, two new risk models are added to their balance sheet: the financial health of the fintech company operating the app, and the code quality of the private script hidden in the background responsible for moving their funds. In pure decentralized finance (DeFi), your only risk lies in the core protocol code. Here, if the intermediary company goes bankrupt, or their private backend script crashes causing fund loss, your money is gone even if Aave itself runs perfectly.
In a true swap market, where both sides can shop around, fixed rates get pulled down close to fair value. Here, the operator unilaterally sets the rate, and the customer has no frame of reference. Users won't compare a 4% rate to Aave's 6%; they'll compare it to their own bank's rate. Aave's app page lists its own rate next to the FDIC's national savings average of 0.40%, making any rate look enticing by comparison.
Perspective: The Operator
Suppose a neobank has $200 million worth of idle user stablecoins. It already has the funds and the users, and those users were acquired at a cost. It only needs to complete one integration, advertise a 4% yield, and if the strategy returns 6%, it merely books $4 million in annual revenue on its balance sheet—revenue that was originally a cost. Low input, but a 2% gain is pretty good.
Rise is a payroll service company paying contractors in 190 countries, having processed over $1.5 billion in payroll. In the past, if companies prepaid salaries a week early, that USDC sat idle, so Rise built Rise Earn, depositing it into Aave's USDC pool on Arbitrum until payday.
Rise takes 1% of the interest, nothing else. Assuming a 6% yield, Rise takes 6 basis points. Employees actually get 5.94%, and they just see Aave's live rate.
Using the same funds, a Stable Vault operator takes a 200 basis point cut. The intermediary's share increases 33-fold.
Perspective: Aave and Stable Vault
Aave's selling point is that its vaults can set different rates based on user loyalty, activity, or tier. For example, premium members could get 5%, while others get 3.5% from the same loan interest pool. Fintech companies issuing their own stablecoins can register them as deposit assets, creating a closed loop. And, yielding balances don't churn, meaning the yield itself is a retention tool.
Do operators get these yields for free? Of course not. It's shorting a two-way spread. This spring, when Aave paid a 2% yield, all vaults promising more than that had to pay out the difference.
This brings us to April 18th. A vulnerability in the Kelp DAO bridge triggered a massive run on Aave on April 18th. Pool utilization hit 100%, completely freezing all withdrawals and trapping both the operator's paper profits and users' funds in the same lock queue.
When utilization caps out, no one, including vaults, can profit from it. Surplus funds pile up on the books, alongside user principal.
If liquidity returns, the operator empties the surplus accumulated during the period users couldn't exit. That surplus is the fee the market pays for illiquidity. It's the users who provide the illiquidity. If liquidity doesn't return, bad debt enters the pool, and the vault becomes undercollateralized. Aave's documentation shows an authorized party can top up the system. There's no reserve behind the word 'can' here.
Aave will claim their contracts were never exploited, it was Kelp's bridge that had the issue not Aave's code, and rsETH was frozen within hours. All true. Previously, just before their risk manager resigned, they voted to accept extremely high-risk collateral with a loan-to-value ratio of 93%, leaving ordinary users to bear the brunt of this crashed app's drawbacks.
Does it seem like Stable Vaults are the final puzzle piece now?
Rise runs salary float through Aave. Kraken white-labeled an integration of Aave v3 into the Tydro protocol on its L2, then pointed its retail product Earn at it, so Kraken users using Earn are also Aave users. Cap Finance holds stablecoin reserves in Tydro.
Horizon partners with institutions like Circle and Franklin Templeton to lend against tokenized treasury bonds. Aave App goes direct to consumers. Stable Vaults open up to everyone else and call it diversification.
Aave doesn't need more deposits. Kulechov told The Block in March that DeFi is awash with liquidity, and the focus must shift to borrowing. He's right, which is why USDC yields dropped from 8% to 2-3%. Aave's perennial problem is that DeFi funds are hyper-liquid, fleeing at a 50 basis point yield drop. An app that controls fund flows like payroll does can turn the most volatile funds in finance into assets as sticky as deposits.
Aavenomics 3.0 went live on June 27th, now automatically buying back AAVE from revenue. Revenue needs to flow regardless of market conditions. In a bear market, sticky deposits are key to keeping the buyback running. How to get those deposits? Answer: Stable Vaults.
Coinbase offers around 4% yield on USDC balances. Robinhood launched Earn on July 1st, offering about 7%, with 28 million accounts already funded. Both call it a savings feature.
Coinbase runs on Morpho and Ethena. Robinhood runs on Morpho and Maple, with risk parameters set by a firm called Steakhouse.
They both had to build this system themselves: custody protocol, custodian, risk team, and months of lawyer work. Aave's contribution is making all that unnecessary. With one integration, any app on Earth can display a number on the screen and track the gap between that number and what borrowers actually repay in real-time.
Banks can use this system because it's backed by a century of law. Reserve requirements, audits, deposit insurance, and regulators who can drop in unannounced—all built on a consensus reached long ago: banks lend out your money, so when loans go bad, someone must stand accountable.
All the functionalities of Stable Vaults can be achieved in just 20-30 minutes. But you need to create a wallet, bridge some USDC, and then supply it to Aave. This way, you avoid KYC, dealing with operators, or waiting for fund rebalancing. And you don't suffer any loss from the spread. You get 6%, not 4%, and can monitor the pool throughout.
I understand the system considers things on a longer timeframe than my logic does. And I don't think people are stupid when they don't do this.
Research by Iyengar and Huberman on retirement plans found that as the number of fund choices increased, participation rates actually fell. Faced with more options, people ended up not joining any plan. All consumer finance products since have been built on this finding.
For fifteen years, self-custody has been the right choice, widely known. Even so, most on-chain card spending still goes through custodial platforms. It's a repeatedly stated, large-scale preference. And their security algorithms are better than ours. For someone with $2,000 and no crypto background, the most likely way to lose funds is losing a seed phrase or sending to the wrong address. An app with Face ID and account recovery eliminates that failure mode that could cause them loss. They pay 200 basis points for insurance against their own risk—a reasonable expense.
So Aave is doing the right thing. This is exactly what a firm with liquidity and no user loyalty should do, and all crypto consumer apps are racing in the same direction because, wherever we go, the same logic exists.
Ultimately, it's an acceptance of human nature. People crave safety, predictability, and most importantly—ease. Life is hard enough, why also manage a private bank account? They just want to close the app and watch that still number.
