PayOS is a cutting-edge payment infrastructure platform tailored for the agentic economy, where AI agents and automated workflows handle various commerce tasks. This innovative system operates as a card-first solution, allowing developers and businesses to seamlessly integrate checkout, billing, and financial transactions into agentic workflows, while accommodating all major card networks and offering flexibility with different processors. Users benefit from a straightforward linking of a card, which can then be utilized across diverse agent-driven scenarios, all while maintaining essential human oversight, robust security compliant with PCI standards, and comprehensive access to a global network. The platform supports both push and pull payment methods, recurring billing, and independent money flows, eliminating the requirement for merchants to undergo re-integration processes. Additionally, PayOS enhances its offerings through tokenization and partnerships with networks such as Mastercard and Visa Intelligent Commerce, facilitating the expansion of agentic payment applications on a large scale. With its commitment to innovation and user-friendly features, PayOS is set to redefine the landscape of payment solutions in the evolving economy.