USDD stablecoin circulation surpasses 1.1 billion, marking a further expansion of the ecosystem's scale in DeFi applications. As an important on-chain asset, the growth trajectory of USDD reflects the ongoing increase in market demand for stablecoins. From an ecosystem expansion perspective, the next phase of reaching 2 billion is not out of reach— as long as ecosystem application scenarios continue to diversify and user adoption steadily increases, this goal is achievable. The development path of stablecoins often indicates the overall health of the DeFi ecosystem and is worth continuous attention.