Large wallet moves $150 million in USDT from Aave to Spark Savings

A single on-chain wallet has pulled $150 million in USDT out of Aave and parked it in Spark’s USDT Savings product, known as spUSDT.

The withdrawals coincided with double-digit borrowing rates. Stablecoin borrowers usually expect single digits, so that kind of reading tends to be a sign of strain rather than a feature.

Why a $150 million move matters

When a depositor of this size walks away, the pool gets thinner. On rate models driven by supply and demand, a thinner pool means pricier loans for everyone still borrowing.

The destination matters too. Spark operates within the Sky ecosystem, and its pitch leans on rate limits and peg stability rather than the free-floating, supply-and-demand approach Aave uses.

The KelpDAO hangover

The story starts on April 18, 2026, when the KelpDAO rsETH exploit hit. The incident left Aave with roughly $195 million in bad debt, largely because rsETH used as collateral turned out to be unbacked.

The reaction was swift. Aave saw estimated net outflows of $10 to $16 billion shortly after the exploit, according to the research findings, with total value locked falling from approximately $48.5 billion to $30.7 billion in just over three days.

Spark was one of the clearest beneficiaries. It recorded $2.4 billion in net deposit inflows after the KelpDAO incident, capturing more than 15% of Aave’s outflows. Broader estimates of SparkLend and its savings vaults put net inflows over the period somewhere between $1 billion and $2.4 billion.

The spUSDT vault in particular had a moment. By April 23, 2026, it had surpassed $1 billion in deposits with yields around 3%, before settling at approximately $600 million by October 7, 2026.

Integrations helped. Spark’s savings products have been plugged into platforms such as the OKX app, which lowers the friction for users who might otherwise never touch a DeFi interface directly.

A flight to boring

The $150 million transfer is a useful snapshot of what large holders appear to want right now. The motivation, based on the research, looks like a preference for liquidity and risk controls over squeezing out the last basis point of yield.

It also shows how concentrated DeFi liquidity can be. One wallet moving $150 million is enough to register on a lending market, and a handful of similar moves can shift borrowing costs for thousands of smaller users who never made a decision at all.

What this means for Aave, Spark and DeFi lenders

For Aave, the immediate issue is confidence. The protocol remains one of the largest lending markets in crypto, but sustained withdrawals by big depositors keep pressure on utilization, and the double-digit borrowing rates seen alongside this exit show how quickly that pressure can reach borrowers.

For Spark, the challenge is different. Winning deposits during a competitor’s crisis is one thing, and the slide in spUSDT from over $1 billion to around $600 million suggests some of that capital is restless. A fresh $150 million deposit helps that number, but it also adds concentration risk.

For the wider DeFi lending sector, the episode is a live stress test of design choices. Aave’s market-driven rates react fast to supply and demand, while Spark’s approach prioritizes stability and controlled flows. The research frames the post-KelpDAO shift as a possible reassessment of protocols around sustainability and reliability rather than raw yield.

Disclosure: This article was edited by Estefano Gomez. For more information on how we create and review content, see our Editorial Policy.