The payment processing industry is facing its most disruptive shift since the invention of the online shopping cart. Agentic commerce, where autonomous AI agents search for products, compare options, and complete purchases on behalf of consumers with minimal or no human involvement, has moved from theoretical concept to live production in a matter of months.
What Happened in Late 2025 and Early 2026
In December 2025, Visa announced that hundreds of secure, agent initiated transactions had been completed in live production environments through its Visa Intelligent Commerce initiative. The company predicts millions of consumers will use AI agents to complete purchases by the 2026 holiday season. ChatGPT's Instant Checkout, built on OpenAI and Stripe's Agentic Commerce Protocol (ACP), has been live since September 2025, serving 900 million weekly users. Walmart, Target, Etsy, Glossier, and Instacart were among the early merchant partners.
In January 2026, Google announced the Universal Commerce Protocol (UCP), backed by more than 20 partners including Walmart, Target, and Shopify, for deployment across Google Search AI Mode and Gemini. Mastercard launched its Agent Pay pilot in the UAE with Majid Al Futtaim, completing the first agentic transaction outside the United States. Amazon chose to build proprietary shopping agents (Rufus AI, Alexa+, and its "Buy for Me" feature) within its own ecosystem rather than joining the open protocols. PayPal launched "Agent Ready," an agentic payments solution enabling its existing merchant base to accept payments on AI surfaces.
The Protocol Race
Multiple competing protocols are now vying to define how AI agents interact with merchants and payment systems. OpenAI and Stripe's ACP powers ChatGPT Instant Checkout and uses Stripe for payment processing. Google's UCP is designed for search intent shopping within Gemini and Google Search AI Mode. Stripe and Tempo's Machine Payments Protocol (MPP) enables agents to pay programmatically for resources without forms or accounts, and notably supports stablecoin payments natively. Visa's Trusted Agent Protocol, launched in October 2025 with Cloudflare and more than 15 partners (including Adyen, Fiserv, Microsoft, Shopify, and Stripe), creates an open framework to help merchants distinguish legitimate AI agents from malicious bots. Mastercard's Agent Pay rounds out the field with an issuer based approach.
Most merchants will likely need to support multiple protocols. ACP and UCP serve different use cases: ACP excels at conversational product discovery within chat interfaces, while UCP captures high intent search queries.
Market Size and the Reality Check
McKinsey projects that agentic commerce could orchestrate between USD 3 trillion and USD 5 trillion globally by 2030. Adobe tracked a 4,700% year over year increase in AI traffic to merchant sites through mid 2025. By 2029, analysts expect AI agents to handle 1% to 4% of all digital payment transactions, which at projected volumes above USD 36 trillion would represent up to USD 1.47 trillion in agent mediated commerce.
The reality today is more modest. Morgan Stanley found that roughly 1% of shoppers currently use agents to complete purchases. Stripe's own co-founders have described parts of the agentic narrative as overhyped, noting that 95% of AI driven sales in 2026 will still complete on merchant websites, not inside the AI. But the direction of travel is clear: 75% of retailer attendees at NRF 2026 reported that they are implementing or planning agentic commerce initiatives.
What Agentic Commerce Means for Payment Processing
For payment processors and merchants, the implications are far reaching. New fraud vectors are emerging rapidly. Visa reported a 450% spike in dark web activity around AI agent fraud tools, driving the creation of "Know Your Agent" (KYA) verification as a new compliance concept alongside traditional KYC. Traditional Strong Customer Authentication assumes a human is present at the moment of payment; agentic commerce moves authorisation upstream, with the consumer setting parameters in advance and the agent executing within those boundaries.
Agentic commerce also introduces a new fee layer. OpenAI charges merchants 4% on every completed Instant Checkout purchase, in addition to standard Stripe processing fees. For a USD 100 order, total platform and processing fees run approximately 7.2%. This is a meaningful new cost for merchants already managing tight margins. Stablecoin integration through Stripe's MPP offers a potential offset for cross border transactions by eliminating foreign exchange fees and enabling instant settlement.