Justin Sun has invested $8 million in River to boost its chain-agnostic stablecoin infrastructure within the TRON ecosystem. River will deploy satUSD, a stablecoin minted 1:1 with multiple assets including USDT and USDD, to enable cross-ecosystem liquidity and high-yield staking on TRON. The integration incorporates major TRON assets and plans institutional yield products, aiming to expand on-chain activity and liquidity.