47% of U.S. shoppers were already using AI for at least one shopping task by late 2025, and Visa had already completed hundreds of controlled agent-initiated transactions, so the bottleneck now is trust plumbing, not agent UX. x402 already showed crypto-native machine payments can work; card networks are fighting over delegated authority, tokenization, refunds and fraud controls for the offchain merchant universe. If Sumvin becomes the permission layer between agent intent and spend policy, Sei is closer to the control plane than the settlement layer, which is where the sticky fees usually sit.

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