AI is transitioning from a decision-making tool to an economic actor capable of autonomous payments, prompting new financial system integrations. Three distinct approaches are emerging: Google's AP2 protocol integrates AI payments within existing financial frameworks, Coinbase's x402 protocol allows AI to operate as an independent economic entity on blockchain, and Stripe's Tempo network focuses on integrating AI payments into current commercial systems. These models reflect different trust logics—regulatory, algorithmic, and commercial—indicating a shift in how trust and responsibility are defined in an AI-driven economy.