In April 2025, Amazon launched “Buy for Me,” which lets its AI agent visit brand websites, select products, enter payment details, and complete purchases without the customer leaving the Amazon app. By September, OpenAI introduced “Instant Checkout” with the open-source Agentic Commerce Protocol, enabling purchases directly inside ChatGPT. In January 2026, Google unveiled the Universal Commerce Protocol at the National Retail Federation conference, an open standard built with Shopify, Target, Walmart, and more than 20 other partners, covering the shopping process from discovery to post-purchase support. Microsoft launched Copilot Checkout at the same conference, and Shopify has since switched on agent-readable storefronts by default across millions of merchants. Gartner projects that by 2028, 90% of B2B purchases, more than $15 trillion, will flow through AI agent exchanges.