The signal
On 22 August 2026, DefiLlama counted $6.64bn of USDS in circulation across tracked networks, down from the $8.18bn snapshot cited by Yearn on 18 June. Supply therefore fell by $1.54bn, or about 19%, in two months. USDS remains accessible: Sky’s documentation still supports fee-free, one-for-one conversion between DAI and USDS.
Why it matters
Sky is turning the former MakerDAO system into a credit and savings infrastructure. USDS provides the digital dollar, while sUSDS distributes a governance-set rate funded by protocol revenue. Current supply confirms substantial use, but the decline shows that scale is not permanent when rates, capital allocation or demand change.
What changes
The system combines overcollateralised crypto loans, offchain financial assets and a USDC reserve for one-for-one conversions. SKY holders vote on rates, debt ceilings and allocations. When consulted, the official documentation displayed $15.96bn of collateral against $11.99bn of stablecoins, a total that includes USDS and DAI among its obligations.
The caveat
Yearn measured $4.11bn of USDC in the parity exit contract on 18 June. That is deep liquidity, but it creates a concentration risk: an address freeze, a USDC depeg or a shrinking reserve could impair this redemption route. USDS is also upgradeable through token-weighted governance, with a 48-hour execution delay.
What to watch
The key weekly indicators are USDS supply, the USDC balance available for exits, the ratio of collateral to obligations, and votes that change the savings rate or risk ceilings. Supply stabilising without greater reliance on USDC would strengthen the model.