While private data may be the future of AI, existing technology makes it difficult or impossible for models & agents to responsibly access this valuable data for context and inference. Beacon Protocol transcends today's data paradigms to redefine privacy, ownership, and incentives to unlock real-time access to private data that will power the next billion agents. By abstracting storage and compute constraints, we enable a modular AI data stack that creates data traceability and sustainable incentives that function across any ecosystem.