Circle AI Agent Buys Phone, Pays in USDC: Autonomous Wallets

An autonomous AI agent recently bought a phone number, made a call, and settled the bill using Circle's new Agent Stack. This demonstration showed the agent purchasing a phone number for 5 USDC, making a call to deliver analysis, and then paying 0.133 USDC for call costs. What's interesting is that this entire process happened without human intervention. The AI agent autonomously managed a digital wallet, decided what to buy, and paid for services on-chain. Circle launched the full Agent Stack on May 11, 2026. This infrastructure includes programmable Agent Wallets, gas-free Nanopayments, and an Agent Marketplace. The Nanopayments system supports USDC transactions as small as 0.000001, designed for high-frequency, low-value interactions. Between March 2025 and March 2026, over 400,000 AI agents used USDC for on-chain purchases, completing 140 million payments totaling $43 million. The average transaction value was about $0.31, highlighting the microtransaction nature of these payments. Notably, 98.6% of all transactions leading up to March 2026 were settled in USDC. This shows how AI agents are already using digital currencies for automated commerce.