SparkLend USDS Borrowing Hits $917M as Rates Stay Low

High attention and emotional sentiment detected.

Spark posted the milestone on Monday. According to the team, borrowing on Ethereum has grown 247% since March. So the book is now approaching $3 billion, and USDS led that growth.

What Spark Claimed About SparkLend Borrowing

In its Monday post, Spark said USDS borrowing rose from $188 million to $917 million. As a result, that single jump accounts for nearly half of a $1.5 billion increase in total borrowing.

Meanwhile, Spark credits competitive rates for the demand. According to the team, 30-day average borrow rates ran 3.9% for USDS, 4.07% for USDT, and 4.3% for USDC. So all three sit below comparable rates across other major pooled markets, the team said.

There is also a refinancing angle. Through Sky’s LitePSM, borrowers can convert borrowed USDS into USDC. Meanwhile, the debt itself stays denominated in USDS. So a trader can draw cheap USDS, swap to USDC, then repay a pricier loan elsewhere.

Co-founder Sam MacPherson also amplified the numbers on X. He simply wrote that SparkLend was growing rapidly.

Where the On-Chain Numbers Line Up

The $917 million figure is the most checkable claim, and it holds. For example, the independent indexer DeFiStar showed the Spark USDS pool at $1.398 billion supplied. At 65.61% utilization, that reconstructs to roughly $917 million borrowed.

Spark’s own series also tracks. Four days earlier, on Sept 17, the team reported USDS borrowing above $800 million on $1.3 billion supplied. So the move to $917 million is fast, yet it still fits the recent trend.

Collateral is growing too. According to Spark, supplied WETH rose 18.6% over 30 days, while cbBTC jumped 44.7%. Because prices were roughly flat, most of that $550 million collateral gain came from real deposits.

The broader book is close to Spark’s framing, though not identical. DefiLlama lists SparkLend active loans at $2.86 billion. Because Ethereum makes up nearly the whole book, that number is approaching $3 billion. Still, a $140 million gap remains.

Where the Math Gets Shaky

However, the headline growth claim does not fully reconcile. If the book is near $3 billion and the increase is $1.5 billion, then March started around $1.5 billion. So that would be roughly 100% growth, not 247%.

Run it the other way and the gap persists. For instance, a 247% rise to about $3 billion implies a March base near $864 million. Yet that also means an increase near $2.14 billion, not $1.5 billion.

So the single USDS line, $188 million to $917 million, is internally consistent. Still, the total-book figures around it are not. Meanwhile, no public dashboard independently pins the March USDS base at exactly $188 million.

Because of that, treat the 247% number as Spark’s own for now. MacPherson separately described growth in ETH terms, which may explain part of the mismatch.

Why SparkLend USDS Borrowing Rates Stay Low

The cheap rates are not a mysterious surplus of lenders. Instead, they come from Sky’s balance sheet. Spark is a Sky Star. So it can mint USDS inventory at Sky’s Base Rate.

Then that inventory flows through the Spark Liquidity Layer. As demand rises, the layer tops up supply. Because of that, the visible borrow rate does not spike the way it does on Aave.

Meanwhile, the spread Spark keeps is thin. Sky pays savers the Sky Savings Rate, while Spark pays Sky a small margin on top. As a result, SparkLend USDS borrowing can price close to that savings rate.

By comparison, Aave’s core USDC and USDT rates sat near 4.1% on Monday, per public dashboards. So Spark’s edge is real, yet narrow. Still, for a large borrower, a few basis points on millions is worth a move.

A Migration Story, Not a New Boom

Still, the context matters. Total USDS supply sits near $6.5 billion, and it has slipped about 3% over the month, per DefiLlama. So a borrowing surge inside a flat stablecoin points to migration, not fresh issuance.

Spark’s own Q2 report showed the cost. Meanwhile, net revenue at the liquidity layer turned negative as the team subsidized stablecoin distribution. In addition, some USDS supply that enables cheap borrows is rented with SPK token rewards.

Blockworks noted the same pattern earlier this year. For instance, Spark gained loan-book share while the wider lending sector contracted. In other words, this looks like share taken in a shrinking market.

The SPK token still reflects the optimism. It traded near $0.022 on Monday, up on the day and up sharply over the month. Earlier in September, Spark said it spent more than $3 million to buy back over 150 million SPK.

What Comes Next for Spark

So the near-term question is sustainability. Sky can keep rates low only while it funds the inventory. Meanwhile, USDS supply is drifting down, not up. For now, watch whether Spark publishes the March baseline that settles the 247% debate.

Even so, the checkable part stands. SparkLend USDS borrowing is near $917 million, and the rates are genuinely cheap. Still, the engine behind them is Sky, not organic demand alone. None of this is financial advice, so verify on-chain figures before acting.