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This article examines key practical initiatives within the x402 ecosystem that advance protocol adoption, such as Kite AI, Questflow, Crossmint, PayAI, and Daydreams. It offers a detailed analysis of how these projects build the payment infrastructure for the AI economy using core systems, payment gateways, and agent frameworks. x402 is establishing itself as a critical standard for autonomous AI payments as it transitions from concept to real-world application.