Somnia, a high-throughput Layer-1 network developed with Improbable and the Somnia Foundation, has announced the launch of USDso as its ecosystem stablecoin. According to Somnia's announcement, USDso is issued and operated by Frax Finance using its frxUSD reserve-backed architecture. The stablecoin follows an over-collateralized model backed by assets including U.S. Treasury bonds and can be minted 1:1 against collateral such as USDC, effectively tapping Frax's off-chain reserve stack through on-chain mint and redeem flows on the Somnia network. The announcement was made on May 5, marking the official launch of this institutional-grade stablecoin.
Frax's frxUSD design operates as a fully collateralized, fiat-redeemable stablecoin system where each unit is backed 1:1 by cash-equivalent reserves such as tokenized U.S. Treasury funds, including vehicles like BlackRock's BUIDL and Superstate's USTB. According to Frax documentation and Aave's asset review, the architecture treats frxUSD as reserve-backed stablecoins with a collateralization ratio above 100%, most recently around 102.38%. Assets are custodied by regulated partners and managed via governance-approved smart contracts. Somnia's USDso adopts this same over-collateralization model, backed by U.S. Treasury bonds with users able to mint USDso using assets like USDC.
A key design feature of USDso is its revenue-sharing mechanism that returns reserve earnings to the ecosystem. According to Somnia's announcement, 90% of the yield will be allocated to DeFi protocols building on Somnia through gauges, liquidity incentives, and protocol rewards, while the remaining 10% will flow into an insurance fund meant to backstop systemic risk. This model echoes the sfrxUSD yield layer, where a separate yield-bearing token captures interest from Treasury-backed reserves, but Somnia directs most income to protocol-level incentives rather than individual stablecoin holders. The design is explicitly meant to "bridge real-world asset yields into DeFi" via tokenized Treasuries and dynamic strategies.
Somnia positions USDso as infrastructure for high-frequency trading, DeFi, and on-chain protocol scenarios. The network's L1 has processed more than 10 billion testnet transactions with a peak daily throughput of 1.9 billion. Somnia argues that its L1 can support low-latency, low-fee environments where a native, yield-recycling stablecoin becomes the unit of account. As more RWA-backed stablecoins plug into high-performance L1s like Somnia, they are likely to become core settlement assets for both DeFi applications and, over time, tokenized traditional finance instruments. A recent analysis noted that reserve-backed models like frxUSD are emerging as a preferred structure for institutional DeFi because they combine 1:1 backing, regulated custodians, and transparent reserve reporting.
