Sonic Labs, the developer behind the Sonic blockchain, has launched USSD (US Sonic Dollar), a new USD-pegged stablecoin integrated directly into its network. The token, announced on March 9, 2026, is backed 1:1 by short-duration U.S. Treasury assets held with regulated custodians.
The reserve structure includes tokenized Treasury products from major financial institutions such as BlackRock (via its BUIDL fund), Superstate (USTB), and WisdomTree. Sonic Labs states that this framework follows the same model used by Frax Finance (FRAX), emphasizing clear redemption mechanics and dependable backing. The stablecoin is built on Frax's GENIUS-compatible frxUSD infrastructure.
USSD is designed to serve as the core stable liquidity layer for the Sonic ecosystem, usable for trading, lending, payments, and settlement within its decentralized finance (DeFi) applications. A key feature is its permissionless, zero-fee minting process. Users can mint USSD through non-custodial smart contracts on Sonic by depositing supported dollar-based assets—including USDC, USDT, PYUSD, USDB, and the aforementioned tokenized Treasuries—at a 1:1 ratio.
The launch includes immediate cross-chain functionality, with minting support from more than ten blockchain networks. This allows users to deposit assets on another chain and receive USSD directly on Sonic, aiming to reduce liquidity barriers between ecosystems. Sonic Labs frames the launch as a strategic move to anchor dollar liquidity within its own network, arguing that a native stablecoin prevents fragmentation and keeps economic activity and incentives internal.
Furthermore, the revenue generated from the underlying Treasury assets backing USSD may later be used to support ecosystem incentives and network development as activity on Sonic grows.
