Stablecoins are emerging as the primary settlement medium for AI-agent commerce, with ultra-small transactions and high-frequency micropayments driving new infrastructure needs. Circle recently unveiled a nano-payment testnet based on USDC to support sub-cent transactions for AI-to-AI payments. As microtransactions scale, payment rails competition is intensifying. On-chain settlement costs have hindered ultra-small payments, as some networks charge fees that exceed the value of transfers as small as $0.0001.
Circle addressed this by off-chain aggregation and delayed on-chain settlement, bundling thousands of transactions for one on-chain settlement. This approach eliminates per-transaction gas fees, making microtransactions economically viable. This approach enables real-time billing, usage-based charging, and inter-machine payments. Usage has grown rapidly: approximately 140 million AI-agent payments were completed over the past nine months, totaling about $43 million, with 98.6% settled in USDC and an average size of $0.31.
Practical use cases have begun to appear. Circle collaborated with Open Mind to test autonomous robots paying in USDC to recharge, and Coinbase rolled out an Agentic Wallet that lets AI agents autonomously pay, monetize, and trade. Coinbase executives say agents will evolve from advisory roles to action, with DeFi position management, computing-cost payments, and content monetization potentially following, provided agents can securely hold and manage funds.
Industry leaders see rapid growth, with fintech executives predicting that AI agents will perform payments and capital allocation as agent commerce expands. Stripe has long been active in this space, launching Tempo—an ecosystem built around stablecoins—and continues to build related infrastructure.
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