Circle Launches Agent Stack — AI Agent USDC Wallets With Nanopayments Down to $0.000001 for Machine-to-Machine Commerce

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Circle announced Agent Stack on May 11, an infrastructure suite enabling AI agents as autonomous economic actors. Five components: Agent Wallets (permissionless policy-controlled wallets for agents to hold and transact USDC), Agent Marketplace (programmatic service discovery), Circle CLI, Nanopayments (gas-free USDC transfers as small as one-millionth of a dollar at machine speed), and Circle Skills. Circle reports $77B in USDC circulation (up 28% YoY) and shares rose 16% on the announcement alongside a $222M token sale valuing its Arc network at $3B.