Agent wallets converge on stablecoins plus policy limits

Visa tokens, x402 USDC and MPP SPTs are different wrappers on the same control problem.

Across Visa Intelligent Commerce, x402 and MPP, the shared design is: the human sets a budget and allowed counterparties; the agent spends inside that envelope; settlement is a stable unit or a card token. The protocols disagree on rail, not on the control problem.

Why it matters

zFinia’s explainer stack should teach the control problem once, then show how each rail implements it.

Source: Visa Developer

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