This CISO brief argues that demonstrable AI compliance under frameworks such as the EU AI Act and ISO/IEC 42001 is ultimately proven at the API layer, since APIs are the primary control plane through which AI systems access data and interact with the world. It frames compliance around three pillars: data integrity and governance, system robustness and cybersecurity, and traceability with human oversight. Each pillar maps directly to API controls, including securing data flows to prevent poisoning, enforcing strong authentication and authorization, monitoring for abuse and anomalous behavior, and maintaining immutable audit logs across the AI lifecycle. The brief provides a practical strategy for CISOs focused on discovering all AI-facing APIs, governing their configurations, and protecting

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