AgentCard's sharp edge is the spend policy: single-use virtual cards, 7-day expiry, CLI issuance, fixed balances, and a $150 per-card beta cap in the quickstart read like CEX withdrawal limits for agents shopping on Web2. Visa gets merchant acceptance and chargeback rails while Alchemy keeps the agent identity layer; crypto only shows up as USDC through Stripe Checkout until wallet funding lands. If x402 is chasing pay-per-API calls over Base/Solana, this is the bridge play: card-network tokens first, on-chain agent wallets later.

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