Agent Card Infrastructure (ACI): A Programmable Financial Control Layer for Autonomous AI Agents

This paper introduces the Agent Card Infrastructure (ACI), a programmable, policy-enforced financial control layer designed to enable safe, auditable, and human-governed spending by autonomous AI agents. As AI systems increasingly execute decisions requiring real-world financial transactions, existing payment infrastructures—built for human actors—fail to provide adequate controls for machine-speed, machine-scale activity. ACI addresses this gap by introducing a new architectural layer that sits atop existing payment rails, integrating cryptographic agent identity, real-time policy evaluation, virtual card issuance, and immutable audit mechanisms. Built on the Techmanity Stack, ACI combines decentralized identity (TIP), sovereign wallet management (PSW), intent-based communication (KNOWDES), and secure execution and settlement frameworks (MetaMesh, WEBBIUM), alongside a hardware-level emergency stop (WEBBTRIX). The system enables fine-grained control through programmable virtual cards bound to agent identities, governed by sub-50ms policy engines, and monitored via verifiable audit trails. This paper advances seven primary contributions: (1) programmable virtual cards as a primitive for agent spending; (2) a real-time policy engine for transaction validation; (3) agent-bound sovereign financial sub-accounts; (4) a hardware kill switch for emergency intervention; (5) scalable multi-agent policy hierarchies; (6) an autonomous agent treasury for capital allocation; and (7) a regulatory architecture positioning ACI as financial control software rather than a financial institution. ACI establishes a foundational infrastructure layer for the emerging autonomous agent economy, enabling scalable deployment without compromising safety, compliance, or human oversight.