Mastercard's Agent Pay lets AI agents shop and pay

Mastercard's rollout of Agent Pay comes as AI agents have been on an unprecedented shopping spree. According to Jorn Lambert, Mastercard's Head of Product, a year ago he and other industry leaders believed that agent-to-agent communication protocols like MCP and ACP would be the pillars for agentic commerce, but that assumption has already become outdated. Instead, the adoption curve has been flattened by mass-market personal agents, creating a critical mass of consumers eager to send their agents to the digital mall.

A significant feature of Mastercard's tool is that it is built on x402, a payments protocol that was baked into the original specs for the internet but never got built until Coinbase resurrected it a few years ago. Lambert explained that x402 is basically a messaging language that can speak credit card or debit card or stablecoin—or whatever form of payment both parties agree upon. Because x402 is open source, anyone can use or build upon it, which may lower the barrier for new entrants.

Agent Pay opens the door to micropayments—paying a trifling amount like 27¢ or $1.87 online. Until now, digital merchants and financial networks have shunned such payments as impractical, due in part to processing costs. Lambert predicts that tools like Agent Pay will spur a wealth of new businesses founded by college kids tinkering in their dorm rooms, though predicting how new technology will be adopted is always perilous.