AgentCard
Issues AgentCard single-use virtual cards, handles checkout 3DS challenges, manages the agent's @agentcard.email inbox for signups and verification codes, and uses the AgentCard USDC wallet for Base/x402 payments. Use when an agent needs to pay a merchant, create a capped virtual card, complete a checkout, fetch paid x402 content, send or read agent email, inspect spend limits, or troubleshoot AgentCard CLI payments.