As AI agents gain autonomous execution capabilities, core commercial functions—discovery, trust, ordering, authorization, and payment—are increasingly handled by machines, giving rise to Agentic Commerce. This shift does not replace existing payment systems but drives a dual-rail model: fiat payments will continue to dominate human-driven commerce, while stablecoins—constrained by regulation and accounting—will primarily serve digital, cross-border, Web3-native, and machine-economy use cases. T