How Mastercard A2A Protect Tackles UK APP Fraud Challenge

Mastercard has launched a fraud protection service for account-to-account (A2A) payments, partnering with Monzo, NatWest and Santander for initial deployment across the UK's Faster Payments network later this year.

The move addresses growing A2A payment fraud, with UK losses reaching £592m (US$794m) in 2024 according to UK Finance data. 

The Mastercard A2A Protect service directly tackles this problem by combining fraud prevention technology with a standardised dispute resolution framework across participating banks.

The timing reflects the rapid growth of A2A payments as consumers abandon card-based transactions for bill payments, peer-to-peer transfers and retail purchases. 

However, this growth has created opportunities for fraudsters who exploit both the immediate nature of these payments and the varying consumer protection standards between different financial institutions.

Mastercard already has a foothold in this market through its Consumer Fraud Risk technology, which protects customers at 15 banks representing 90% of UK A2A payment volumes. 

The AI-powered transaction scoring system has proven effective since its 2023 launch, contributing to a 20% reduction in Authorised Push Payment (APP) fraud cases in 2024. The new A2A Protect service builds directly on this foundation.

Salim Secretary, Head of Payment Schemes, Partnerships and Commercial at NatWest, says the bank is "driving innovation and working closely with Mastercard to help our customers". Salim adds that "this new initiative will help protect customers and merchants".

How Mastercard AI targets mule accounts

The technical architecture behind A2A Protect addresses the core vulnerabilities that fraudsters exploit. 

Operating as an overlay to existing A2A payment infrastructure, the service can be deployed across different payment initiation mechanisms without requiring banks to overhaul their underlying systems.

The fraud prevention component enhances Mastercard's existing transaction scoring capabilities while incorporating its Trace solution, which uses AI and network data to identify money laundering activities and flag suspicious "mule" accounts. 

This approach means banks receive both real-time transaction risk assessment and broader network intelligence about fraudulent activity patterns.

Beyond prevention, the service establishes multilateral standards for transaction disputes and fraud cases. Banks can gain access to a uniform procedure for resolving disputes through Mastercard's centralised platform, which the company claims will reduce both resolution costs and timeframes. 

The framework covers the entire transaction lifecycle, offering customers protection before payments through enhanced fraud detection, during transactions through real-time risk assessment, and after completion through standardised dispute processes.

Initially, A2A Protect focuses on APP fraud before expanding to cover disputes over goods and services, reflecting the most pressing pain points for both banks and consumers.

Andy Sacre, Head of Payments at Monzo, emphasises that "collaboration and information sharing are essential to fight fraud". Andy explains that Monzo is "working with Mastercard to build a tool that gives banks access to industry-wide data to help them spot suspicious transactions".

He adds that "A2A Protect will enhance our work even further, giving us more insights to stay one step ahead of fraudsters and keep our customers safe".

New PSR rules drive adoption

The regulatory backdrop has created strong incentives for banks to adopt standardised fraud protection. 

The UK's Payment Systems Regulator introduced a 50:50 liability model for APP fraud, requiring both sending and receiving banks to share responsibility for consumer losses. This shift has pushed financial institutions to seek more robust fraud prevention tools rather than simply managing liability after the fact.

Mastercard A2A Protect builds on this regulatory framework by standardising protection levels across participating institutions, potentially reducing the compliance burden while improving consumer outcomes. 

The service also aligns with the UK government's National Payments Vision, which outlines modernisation plans for the country's account-to-account payment systems while maintaining consumer trust.

Paul Horlock, Chief Payments Officer at Santander, says "the alignment of capabilities and security across payment channels is critical to enable choice and protecting consumers". He describes the Mastercard initiative as "a promising addition to the evolving landscape of A2A payment utility and security".

The business case extends beyond regulatory compliance. Financial institutions face growing pressure to balance the convenience of instant payments with effective fraud prevention measures. 

While traditional card networks have provided standardised dispute processes and liability frameworks, A2A payments have operated with different protection levels between banks, creating operational challenges and consumer confusion.

For banks, the service addresses practical problems around managing fraud investigations and dispute resolution across different payment types. 

Standardised procedures and centralised processing promise to reduce the administrative burden of handling consumer complaints and fund recovery requests, particularly as A2A payment volumes continue to grow.

What’s more, the partnership structure allows banks to implement the service without significant infrastructure changes, since the protection mechanisms operate through Mastercard's existing network infrastructure rather than requiring new payment rails or processing systems.

While Mastercard designed the service for global deployment, the UK launch represents the first market implementation. 

The company has not disclosed timelines for expansion to other jurisdictions or additional bank partnerships beyond the three UK institutions, though the regulatory and commercial pressures driving adoption in the UK exist in multiple markets worldwide.

Standardised procedures and centralised processing promise to reduce the administrative burden of handling consumer complaints and fund recovery requests, particularly as A2A payment volumes continue to grow.

What’s more, the partnership structure allows banks to implement the service without significant infrastructure changes, since the protection mechanisms operate through Mastercard's existing network infrastructure rather than requiring new payment rails or processing systems.

While Mastercard designed the service for global deployment, the UK launch represents the first market implementation. 

The company has not disclosed timelines for expansion to other jurisdictions or additional bank partnerships beyond the three UK institutions, though the regulatory and commercial pressures driving adoption in the UK exist in multiple markets worldwide.

Jorn Lambert, Chief Product Officer at Mastercard, says the service “delivers meaningful benefits to every participant in a transaction”. 

John explains that “it lowers operational costs for financial institutions through standardised real-time fraud insights and streamlined dispute resolution, and all participants benefit from quicker and more predictable outcomes”.

“Most importantly, consumers can feel reassured they have the appropriate protection when making account-to-account payments,” John concludes.