The financial landscape has evolved dramatically since PSD2 was introduced in 2019. Major global banks like BBVA and NatWest were among the early adopters of account aggregation. In the years since, it has become a cornerstone of open banking strategies worldwide.
As banks move toward data-driven ecosystems, account aggregation has shifted from an optional feature to an essential service. It provides customers with a unified, transparent view of their finances while enabling banks to deliver more personalized and profitable experiences.
We’ll explain what account aggregation is, how it works, the benefits it offers banks, and the challenges institutions must overcome to implement it effectively.
What Is Account Aggregation?
Account aggregation is a financial service that consolidates data from multiple accounts into a single, secure platform. It allows users to view and manage all their financial information in one place. Users gain complete control of their account management, from bank accounts and credit cards to investments and loans.
Using APIs and strong consent frameworks, account aggregation tools connect directly to financial institutions, pulling real-time data on balances, transactions, and spending habits. This unified perspective empowers users to understand their financial health better and make informed decisions.
Account aggregation offers convenience, enhances transparency, streamlines management, and supports more effective budgeting. It’s now widely used across industries, including personal finance, lending, insurance, and wealth management.
As an embedded feature within mobile apps or a standalone platform, account aggregation functions like a connector that bridges data across:
- Retail banking applications
- Business and corporate banking platforms
- Personal finance and budgeting tools
- Wealth management solutions
- Customer data and analytics platforms
Ultimately, account aggregation helps both banks and customers gain clearer insights into financial activity while improving digital engagement.
How Does Account Aggregation Work?
There are two primary ways banks implement account aggregation:
- Single-Bank Aggregation: Users link multiple accounts within the same financial institution.
- Cross-Bank Aggregation: Customers connect accounts across numerous banks or financial service providers.
When users opt in, they authorize the aggregator, either the bank or a third-party platform, to access account data through secure APIs. This information is read-only, meaning it can be viewed but not altered, preserving data integrity.
Data Retrieval Methods
Account data can be gathered in two main ways:
- Screen Scraping: Data is extracted using user-provided credentials (like usernames and passwords) to log into another institution’s platform. Although functional, this approach poses higher security risks and is being phased out in favor of standardized APIs.
- API Connections: APIs provide direct, secure links between banks and aggregators. They allow consistent data sharing using authentication standards such as OAuth 2.0—offering greater safety, reliability, and compliance with open banking regulations.
Regardless of method, all shared data remains encrypted and accessible only under user consent.
Transitioning from mechanics to value, let’s explore how account aggregation benefits both customers and financial institutions.
Benefits of Account Aggregation for Banks
While account aggregation clearly benefits consumers, it also provides strategic advantages for banks as open banking becomes the global standard.
1. Enhanced User Experience and App Engagement
One of the most immediate advantages for banks is an improved digital user experience (UX). Account aggregation allows customers to view all of their financial information in one app, eliminating the need to log into multiple platforms.
By enhancing the usability and design of their mobile banking applications, banks can:
- Increase daily engagement and customer satisfaction
- Strengthen app stickiness by becoming the go-to financial hub
- Deliver real-time financial insights to users
Adding analytics and visualization features, such as spending patterns and personalized recommendations, deepens customer trust and retention.
2. Improved Credit Evaluation and Loan Performance
Lending remains a core source of revenue for banks, but poorly informed lending decisions can lead to non-performing loans (NPLs).
With account aggregation, banks can access a more comprehensive, real-time view of a borrower’s financial health. Aggregated data, including income patterns, outstanding debts, and savings behavior, enhances credit assessments and risk modeling.
This insight helps institutions:
- Identify creditworthy borrowers more accurately
- Offer customized loan terms
- Prevent defaults and strengthen overall portfolio health
3. Competitive Advantage Against Digital-First Challengers
The rise of neobanks and digital challengers has disrupted traditional banking. These newcomers often attract customers with convenience and user-friendly digital experiences.
However, most neobanks still focus on limited services such as debit cards or simple savings accounts. Traditional banks, with their diverse product portfolios, can use account aggregation to compete strategically.
By integrating external accounts into their apps, traditional banks can:
- Present customers with a holistic view of all their finances
- Build detailed customer profiles from aggregated insights
- Cross-sell behavior-based in-house products: insurance, loans, or investment services
In short, account aggregation allows traditional institutions to adopt the agility of Fintechs while leveraging their broader product base and brand trust.
Challenges of Implementing Account Aggregation
Despite its advantages, the successful implementation of account aggregation requires addressing several key challenges related to privacy, security, and governance.
1. Customer Privacy and Consent
Data privacy is one of the biggest hurdles. While users value convenience, many remain uncertain about how long their data will be shared and who can access it.
A Clearing House survey found that only 21% of customers fully understood that aggregation services continue accessing their data until consent is revoked.
To address this, banks must:
- Provide transparent consent mechanisms explaining data use and duration
- Allow users to grant and revoke access at any time easily
- Comply with regulations such as GDPR, CCPA, and local open banking frameworks
Clear communication builds trust and ensures customers feel in control of their information.
2. Security and Standardization
Security is foundational to open banking success. Yet, many financial institutions are still transitioning toward unified API standards and authentication protocols.
To offer secure aggregation, banks must:
- Evaluate all existing APIs against security, compliance, and networking benchmarks
- Adopt standardized protocols such as OpenID Connect and OAuth 2.0
- Implement end-to-end encryption and multifactor authentication
- Continuously monitor API activity for suspicious access attempts
While these measures require investment, they are crucial for minimizing risk and ensuring customer confidence.
3. Data Governance and Infrastructure
Aggregated data can be incredibly valuable if managed responsibly. A strong data governance framework ensures compliance, transparency, and integrity across the aggregation ecosystem.
Banks should maintain:
- A centralized repository for monitoring and tracking aggregated data flows
- Defined access controls specifying who can view and analyze data
- Automated vulnerability management and patching procedures
- Continuous traffic monitoring and anomaly detection tools
Building a modern governance framework requires not only the right technology but also cross-department collaboration between compliance, IT, and data management teams.
By addressing these challenges, banks can transform aggregation into a powerful enabler of innovation and customer loyalty.
The Future of Account Aggregation in Open Banking
Account aggregation is evolving from a value-added feature to a core pillar of open banking ecosystems. As financial institutions adopt API-first architectures, aggregation will drive deeper integration across products, partners, and user experiences.
Future advancements will include:
- AI-Powered Analytics: Predictive models analyzing aggregated financial behavior to deliver hyper-personalized insights.
- Embedded Finance: Aggregation APIs integrated into non-bank platforms—such as e-commerce and travel—allowing financial data to enhance contextual experiences.
- Greater Interoperability: Unified data exchange standards that simplify integration between banks, Fintechs, and third parties.
- Real-Time Compliance: Automated monitoring systems that enforce privacy and consent dynamically.
Banks that adopt account aggregation early will not only meet regulatory demands but also unlock new opportunities in digital engagement and cross-selling.
Unlocking Value Through Account Aggregation with KMS Solutions
Account aggregation is the modern foundation of open banking success. By securely consolidating customer financial data, banks can better understand users, offer tailored products, and strengthen long-term relationships.
At KMS Technology, we help financial institutions design and implement scalable account aggregation systems that enhance interoperability, security, and compliance.
Our expertise includes:
- Open Banking Enablement: Designing and integrating secure, API-based data-sharing frameworks.
- Custom Aggregation Platforms: Developing end-to-end solutions for data connectivity across banks, Fintechs, and third-party providers.
- Advanced Data Governance: Ensuring complete visibility, access control, and regulatory alignment for aggregated data.
- Continuous Support: Maintaining and optimizing API performance to ensure uptime, reliability, and trust.
We help organizations connect banking data to accelerate open banking innovation.
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