This paper introduces JANUS, a Stablecoin 3.0 protocol designed to address the stablecoin trilemma--simultaneously improving decentralization (D), capital efficiency (E), and safety-stability (S). Building upon insights from previous stablecoin generations, JANUS leverages a dual-token system (Alpha and Omega), integrates crypto-assets and real-world assets (RWAs), employs a soft-peg mechanism, and utilizes AI-driven stabilization. We provide a comprehensive theoretical framework, including formal definitions of D, E, and S, along with equilibrium existence proofs and analogies drawn from international trade and open-economy macroeconomics. By introducing a second token backed by external yield, JANUS breaks from ponzinomic dynamics and creates a more robust foundation. Multi-collateralization and a soft peg enable controlled price oscillations, while AI-driven parameter adjustments maintain equilibrium. Through these innovations, JANUS aims to approach the center of the stablecoin trilemma, offering a globally resilient, inflation-adjusted, and decentralized stablecoin ecosystem bridging DeFi and TradFi. The main body presents a high-level overview of the trilemma and JANUS's key features, while the Appendix provides more formal mathematical treatments, including rigorous metrics for decentralization, capital efficiency, and stability, as well as the optimization challenges inherent in the trilemma.

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