Santander and Mastercard Complete First AI Agent Payment

Banco Santander and Mastercard have successfully processed Europe’s first live end-to-end payment executed by an AI agent. The transaction marks the first instance of an agentic payment carried out within a regulated banking environment, signaling a shift in how financial institutions may soon manage transactions initiated by non-human actors.

The pilot was conducted in a controlled setting using Mastercard Agent Pay, a solution launched in mid-2025 designed to integrate AI agents into the existing financial ecosystem as governed participants.

By processing the transaction through Santander’s live payments infrastructure, the partners validated the operational and control frameworks required for AI systems to act on behalf of customers under real-world conditions.

Autonomous transactions with guardrails

The technical core of the trial focused on agentic capabilities. The system allows these agents to execute payments within predefined limits and permissions set by the account holder. This ensures that while the AI operates with autonomy, the customer retains oversight through strict security, privacy and protection standards.

The orchestration of the transaction was supported by PayOS, facilitating the interaction between issuers, acquirers and merchants.

Matías Sánchez, Global Head of Cards and Digital Solutions at Santander, notes: “At Santander, we see AI as a transformative force in the evolution of payments. Our role is not only to adopt innovation, but to shape it responsibly, embedding security, governance and customer protection by design. As AI agents become part of everyday commerce, building trusted, scalable frameworks will be essential to unlocking their full potential.”

Following this milestone, Banco Santander intends to move into extended testing. The bank will explore further use cases and partnerships to ensure technical and operational readiness while maintaining regulatory alignment.

Bridging AI and legacy networks

A critical hurdle for agentic commerce has been the integration of autonomous software into legacy payment networks. Mastercard Agent Pay aims to bridge this gap by treating AI agents as visible entities within the payment flow, applying the same principles of interoperability and scale that govern traditional card transactions.

Kelly Devine, President, Europe at Mastercard, comments: “Agentic payments represent a profound shift in how commerce is initiated and executed. With Mastercard Agent Pay, we are applying the same principles that have defined our network for decades –  security, trust, interoperability and global scale –  to a new era of AI-enabled commerce. This milestone with Banco Santander demonstrates that innovation and trust can advance together.”

The collaboration serves as a proof of concept for the wider industry. While the pilot was conducted within Santander’s regulated framework and does not yet constitute a commercial rollout, it provides a blueprint for how banks can govern AI-driven transaction models.

Scaling the framework

The success of the pilot confirms that the existing payment rails can be adapted to support autonomous agents without compromising the integrity of the banking system. The focus for both Santander and Mastercard now shifts to resilience and the refinement of the governance models that will dictate how these agents interact with merchants.

By embedding AI agents directly into the payment flow, the firms are positioning themselves at the forefront of a new era where invisible payments become a standard feature of digital commerce.