SparkLend, the lending arm of the Sky Protocol ecosystem, currently shows more than $725 million in wrapped Ether borrowed at a variable rate of just 1.81%. That’s a borrowing cost low enough to make traditional finance blush, and it’s attracting serious capital.

The protocol’s utilization rate sits at 70.7%, meaning roughly seven out of every ten dollars deposited into its WETH pool are actively being lent out.

How SparkLend keeps rates anchored

The protocol deliberately pegs its WETH borrowing cost to stETH staking yields, specifically using a two-day average minus 10 basis points.

In English: if you can earn, say, 1.91% by staking ETH through Lido, SparkLend will let you borrow ETH for roughly 1.81%. The spread is razor-thin by design.

Steady growth, not a spike

A snapshot from May 21 showed $761 million in WETH borrowed at a slightly higher rate of 1.85%, with utilization touching 72.1%. That same period saw nearly $1.95 billion in wstETH (wrapped staked ETH) supplied to the protocol as collateral.

Going further back, data from January 15 pegged total WETH borrowing at $711.1 million, representing 46.2% of SparkLend’s overall $1.54 billion borrowing pool at that time. So from January through June, the protocol has maintained borrowing volumes in the $700M to $760M range for WETH alone, with only modest fluctuations.

What this means for investors

SparkLend is an Aave V3 fork operating under Sky governance (formerly MakerDAO). For ETH holders, sub-2% borrowing rates mean cheap leverage. If you’re bullish on ETH and want exposure without selling other assets, SparkLend offers one of the most cost-effective ways to do it in DeFi right now.

SparkLend’s approach anchors rates to an external yield benchmark — staking returns — rather than using algorithmic interest rate curves that respond to utilization, as traditional lending platforms like Aave and Compound do.

The risk is that staking yields could shift dramatically. If Ethereum’s staking rate drops significantly, SparkLend’s borrowing rate follows, potentially compressing lender returns to unattractive levels. Conversely, if staking yields spike, the spread narrows in a way that could reduce the looping incentive.

There’s also concentration risk to consider. With nearly $1.95 billion in wstETH supplied and $725 million in WETH borrowed, the protocol is heavily tilted toward a single asset class. A sharp ETH price decline wouldn’t just hit borrowers. It would pressure the entire collateral base simultaneously.