Santander and Mastercard announced they have successfully completed an end-to-end payment transaction with an AI agent.
This marks the first live end-to-end payment carried out by an AI agent within a regulated banking framework, and signals a significant move towards a world where AI agents complete transactions on behalf of people.
The transaction, which involved the purchase of a t-shirt, was carried out through Mastercard Agent Pay – the company’s token-based agentic commerce technology.
Mastercard Agent Pay launched in 2025 as a means of letting users make agentic purchases within predefined parameters to ensure safety and transparency.
The transaction was processed through Santander’s live payments infrastructure. In a statement, Mastercard explained that this move allows an AI system to securely and transparently complete a purchase using existing payment networks.
Crucially, the AI agent operates within predefined spending limits and permissions set by the customer, embedding consent and governance directly into the transaction layer. Mastercard Agent Pay integrates AI agents as visible, governed participants in the payment ecosystem – rather than as invisible backend tools.
Nevertheless, this is a pilot, and the financial companies haven’t announced a commercial rollout of an agentic commerce offering yet.
AI Commerce Infrastructure
What makes this transaction significant is that it was carried out by a major European bank, and has taken place inside a regulated framework.
The AI agent is also recognised as a transaction initiator and is treated as a governed actor in the payment ecosystem.
In this sense, it ran through Santander’s actual banking system and Mastercard’s network, instead of it being a test.
While automated and recurring payments have existed for decades, this milestone differs in that the AI agent is explicitly recognised as the transaction initiator. Rather than simply executing a pre-programmed instruction, the agent operates within defined permissions and decision-making parameters, marking a shift from automation to agentic commerce.
“As AI agents become part of everyday commerce, building trusted, scalable frameworks will be essential to unlocking their full potential,” said Matías Sánchez, Global Head of Cards and Digital Solutions at Santander.
