Aave’s implemented USDT rate change targets more withdrawal headroom through higher borrowing costs, while exits still depend on available pool cash.

Aave has lowered the utilization threshold at which borrowing rates for Tether’s USDT rise sharply on its Ethereum Core market, making loans more expensive sooner as pool liquidity tightens.

Using the supply balance in an Oct. 20 recommendation by DeFi risk service provider LlamaRisk, the shift corresponds to roughly 57.8 million USDT more modeled unborrowed liquidity at the threshold.

The change was executed on Oct. 21 in Ethereum block 26,241,799. The threshold fell from 94% utilization, the share of borrowed pool liquidity, to 92%. Borrowers can still go beyond that point, but the rate climbs more sharply once they do.

The trade-off for lenders is earlier pressure on borrowers to preserve withdrawal headroom. The intended cushion remains available to be borrowed or withdrawn.

Aave’s two-slope model increases borrowing rates gradually up to an optimal utilization point, often called the kink, then more sharply between that point and full utilization. Lowering the kink moves the more expensive part of the curve earlier.

The deployed USDT parameters at the Oct. 23 block were a 92% optimal usage ratio, a zero base rate, a 4.5% first slope, and a 10% second slope. Those settings leave the rate at the kink at 4.5% APR and the rate at 100% utilization at 14.5%.

Comparing the curves at the same utilization reveals the cost difference. 5% APR. Under the implemented curve, that same utilization is 2% into the eight-point range above the new kink.

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