The liquidity condition had been tighter earlier in the week. Spark said on Oct. 29 that $USDT supply APY had “hit 18%+ this week” and utilization had exceeded 99%. Those are variable annualized rates, not a return locked in when a supplier deposits.
Withdrawals Also Move the Rate
Borrowing is not the only activity that changes utilization. An Oct. 28 transaction shows Spark’s own Liquidity Layer withdrawing 14.52 million $USDT from SparkLend at 8:57:59 a.m. ET. The transaction also updated the reserve’s interest rates.
Spark’s documentation says its Liquidity Layer moves $USDT, USDC and USDS into and out of SparkLend based on borrowing rates, utilization and inventory at other venues. That makes the available withdrawal buffer responsive to allocations as well as borrower repayments and user deposits.
The episode follows a separate movement of $USDT away from Aave earlier this month. The Defiant previously reported that one wallet moved 150 million $USDT from Aave V3 into Spark Savings in two transfers on Oct. 5 and 6, ET.
Those deposits went into Spark’s $USDT savings vault, not directly into SparkLend. Spark Savings deploys funds through the Liquidity Layer, and its governance-managed depositor yield is distinct from the rate paid by SparkLend borrowers.
