Tether vs USDS

Key differences

Tether (USDT) and USDS are both U.S. dollar stablecoins, but they come from different traditions. USDT, issued by Tether, is the oldest and largest fiat-backed stablecoin, created to act as a digital dollar on exchanges. USDS is the stablecoin of the decentralized Sky ecosystem, maintaining a soft peg to the dollar and designed primarily as a working asset within decentralized finance.

Scale is a major difference: USDT's circulating supply is roughly 183 billion tokens, against about 9.8 billion for USDS. Both supplies are elastic, expanding and contracting with issuance and redemption rather than following a fixed cap, and neither token operates its own consensus — both are issued on host blockchains. USDT spans an especially wide set of networks, including Ethereum, Tron, Solana, TON, and Avalanche; USDS is present on Ethereum, Solana, Arbitrum, and Base.

Their ecosystem roles differ in emphasis. USDT dominates centralized exchange trading pairs and functions as the de facto dollar of crypto markets. USDS is built to be put to work inside its protocol: holders can convert it to sUSDS to earn interest from protocol revenue or lock it for SKY governance tokens, and the Sky ecosystem extends through semi-autonomous units called Sky Stars.

The practical distinction is issuer model and habitat: a centralized issuer serving global exchange liquidity versus a DeFi-native ecosystem token oriented toward on-chain lending, saving, and governance.