Open Banking
Financial Services
Open Banking
Financial Services
March 7, 2023
8 Min

Open Banking APIs: Benefits, Examples, and Security Considerations

Trustly

Imagine a bank that knows you better than your best friend, anticipates your every financial need, and makes managing your money a breeze. 

Sound too good to be true? It might be, if your bank is still stuck in the past. Fortunately, Open Banking APIs are helping users connect their bank accounts to various financial services, including payment platforms, credit services, online investment tools — you name it.

In this article, we’ll examine the technical aspects, security considerations, practical applications, and future possibilities of Open Banking APIs. Here’s everything you need to know about this rapidly developing technology and the world of Open Finance.

What Is an Open Banking API?

An Open Banking API acts as a gateway for customers to easily share their data with both FinTech companies and traditional banks. It empowers consumers to conduct transactions and grants permission to share their banking details with third-party services directly through their bank accounts.

These Open Banking APIs act as a set of tools that help different software systems used by banks and FinTech companies communicate by exchanging financial information back and forth.


Unlike API (application programming interface) banking, where external parties use APIs to access tools and services of the bank to develop customer solutions, Open Banking APIs are specifically designed to facilitate the sharing of banking data, including account details, transaction history, and account types between financial institutions and their customers.

What Is the Role of an Open Banking API?

Open Banking APIs are revolutionizing the financial sector by enabling secure data exchange among banks, FinTech firms, and third-party providers (TPPs) in real-time. These APIs serve as a connection point that permits authorized entities to access and leverage customer financial data in many innovative ways.

Some key functions of Open Banking APIs include:

  • Facilitating the secure sharing of financial data to enable TPPs to develop custom services and products
  • Simplifying payment procedures by empowering TPPs to initiate payments directly from a client's bank account
  • Supporting the creation of financial management tools through data aggregation from various accounts and providers
  • Fostering competition and innovation within the financial industry, compelling traditional banks to enhance their offerings
  • Helping banks improve efficiency and cut down on operating costs through automation

With so many potential use cases, the rise of Open Banking APIs is set to revolutionize how we engage with financial products and services. But it’s difficult to grasp the real upside of this new technology in a silo.

That said, let's examine some of the challenges of traditional banking and draw a fair comparison between the two.

The Challenges of Traditional Banking

Unlike modern Open Banking APIs, traditional banks rely on outdated systems, limiting their capacity to adopt new technologies and keep up with increasing customer demands. 

Modern consumers have high expectations for personalized services and seamless banking interactions, from checking balances to applying for loans. Unfortunately, large traditional banks can’t operate at the same speed that freshly minted tech startups can. Again, this is why Open Banking APIs are so crucial — it allows legacy banks to tap into new financial services to enhance their services and provide more value to their customers.

Benefits of Open Banking APIs

The advantages of Open Banking APIs are extensive, ranging from reduced processing costs to increased transparency between parties involved in online transactions. Here’s why incorporating open APIs in banking is beneficial in a nutshell:

  • Far greater personalization and improved user experience for customers across financial services and platforms
  • Reduced payment processing costs and administrative efforts
  • Streamlined verification processes for online transactions
  • Improved business transparency between parties during online transactions
  • Increased collaboration between legacy banks and new FinTechs, resulting in new products
  • Easier access to financial information via account aggregation, resulting in a far better customer experience

And that’s just the tip of the iceberg. More than anything, these APIs play a crucial role in fostering innovation and expanding partnership initiatives among financial institutions, old and new.

Examples of Open Banking APIs in the Wild

Sure, an API that keeps data flowing between cutting-edge FinTech platforms and legacy banks sounds great in theory … but does it actually work?

Yes! Open Banking APIs are already helping customers and companies large and small to streamline their financial operations. Here are some real-world examples of these APIs at work.

Trustly and PointsBet

One company leveraging the benefits of Open Banking APIs is PointsBet, an online sports betting platform. 

PointsBet integrated Trustly's Open Banking payment solution to provide their users a seamless deposit experience via direct bank transfers. This allowed PointsBet to bypass traditional card transaction fees while ensuring guaranteed payments and high approval rates above 90%. During high-traffic events like the Super Bowl, for example, Trustly's Open Banking APIs maintained 100% uptime and processed a peak of 192 transactions per second reliably. 

The Trustly Open Banking integration also accelerated PointsBet's expansion into new state markets like New York and Kansas by reducing the typical 30-day launch cycle to under two weeks. Overall, PointsBet saw over 200% year-over-year growth in both payment volume and completed transactions thanks to leveraging Open Banking with Trustly.

HSBC and Bud

HSBC’s collaboration with Bud marks a significant step in revolutionizing their mobile banking services. 

For starters, by integrating Bud's advanced financial management tools into its banking app via Open Banking APIs, HSBC can now offer customers the convenience of accessing all their accounts in one place — even those from different banks — through a single interface. That’s the power of Open Banking.

This partnership also highlights just how personalized the future of banking is becoming. Customers no longer need to switch between multiple apps or websites to access their account data, check their account balance, or do some quick budgeting. Instead, they can conveniently access all their financial accounts, transaction data, and more from one app.

Regulatory Environment and Compliance Considerations

While Open Banking APIs present opportunities for both financial institutions and consumers alike, there are still questions to be raised around regulation. Specifically, how are government regulators working to ensure that sensitive financial information is handled appropriately?

Well, one important regulation that will influence its direction in the U.S. is Section 1033 of the Dodd-Frank Wall Street Reform and Consumer Protection Act — overseen by the Consumer Financial Protection Bureau (CFPB). Section 1033 mandates that financial institutions offer their customers access to their financial information in an electronic or digital format.

So how does this affect Open Banking, exactly?

Well, this rule is significant as it sets the stage for data portability, allowing customers to authorize their financial information to be securely shared between their bank and external applications or services, which is crucial for the functionality of Open Banking APIs.

But this mandate does far more than ensure consumer data accessibility. Section 1033 also places a strong emphasis on consumer privacy by requiring explicit consent for data sharing and implementing robust security measures. Following Open Banking principles, consumers can retain control over how their financial information is utilized and exchanged under section 1033.

Despite these recent regulatory changes, the specific guidelines and technical standards for complying with Section 1033's data sharing rules are still being developed by the CFPB. Financial institutions and fintech companies developing Open Banking solutions must stay up to date on these evolving regulations to guarantee that their APIs and data sharing mechanisms adhere fully to the requirements — otherwise, they risk becoming non-compliant.

Ultimately, financial institutions who wish to make use of Open Banking APIs must first establish strong protocols for verifying consumers and managing their consent effectively. This means putting in place strict measures for data security and encryption and potentially adopting new data sharing standards required by the CFPB.

Technical Aspects and Security Considerations

While compliance and regulations are a good starting point, they don’t guarantee that your customers’ sensitive financial information is going to be protected from bad actors.

That’s why it’s crucial you understand how information is exchanged between financial institutions. In this context, Open Banking APIs use RESTful APIs that utilize HTTP protocols and standard methods like GET, POST, PUT, and DELETE for data exchange. Depending on the nature of the transactions taking place, this data is then shared between financial institutions, FinTech companies, and TPPs. Typically, this data is shared in JSON format due to its lightweight nature and compatibility with various programming languages.

And in terms of security, the APIs use OAuth, a widely used security protocol. This protocol allows users to grant TPPs access to their data without revealing login details or other sensitive information. A few additional security measures include encryption, SSL certificates, and multi-factor authentication

Securely implementing Open Banking APIs involves several important practices, including:

  • Staying current with system updates to proactively address vulnerabilities
  • Conducting regular security assessments and audits
  • Enforcing strong access controls with vigilant monitoring
  • Providing clear guidance on data sharing and privacy policies
  • Establishing a plan for responding to potential breaches

Open Banking API Ecosystem and Partnerships

Similar to traditional banking, the success of Open Banking APIs hinges on establishing a vibrant ecosystem and nurturing collaborations among banks, FinTech firms, and various other players. On the one hand, the banks bring their established customer base, financial acumen, and regulatory know-how to the table. At the same time, FinTech companies contribute technological advancements, the ability to pivot quickly, and a customer-focused approach.

Importantly, these partnerships open up new revenue streams. The banks can leverage their data and infrastructure for monetization purposes, while FinTech companies gain access to financial data and services to develop new products. It’s a win-win for both parties.

Plus, the Open Banking API ecosystem isn’t limited to banks and FinTech companies but also regulators, industry associations, and technology providers. Within this API ecosystem, several organizations are standing at the ready to offer support to stakeholders who are trying to navigate the world of Open Banking or banking as a service.

For example, industry associations like the Financial Data Exchange in the U.S. can offer:

  1. Regulatory guidance: Helping stakeholders understand and comply with Open Banking regulations and standards
  2. Technical support: Providing resources, best practices, and advice on implementing Open Banking APIs and related technologies
  3. Networking opportunities: Facilitating collaboration and knowledge-sharing among stakeholders in the Open Banking ecosystem
  4. Education and training: Offering workshops, webinars, or courses to help stakeholders stay informed about the latest developments and best practices in Open Banking
  5. Advocacy and representation: Representing the interests of their members and the Open Banking community to regulators, policymakers, and other relevant authorities

With such a strong community of established financial institutions, new players, and government organizations working together to support digital banking, the future of traditional banking is changing fast. 

But in order to keep pace with these changes, you need to partner with a company that understands its nuances inside and out. This is why Trustly was built. 

Navigate Open Banking With Trustly

Since 2008, Trustly has remained committed to the global expansion and adoption of Open Banking, and the opportunity Open Banking affords merchants and consumers. Our direct API connections with financial institutions are continuously monitored and optimized to maintain at or close to 100% connection quality. 

In doing so, Trustly can maintain a partner-like relationship with financial institutions and improve consumer conversion metrics. Trustly has been a driving force for Open Banking in Europe and is continuing the momentum in the United States.

Need help navigating Open Banking and simplifying your cashless payments? Schedule a meeting with an Open Banking expert to get started.

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