Open-Loop Payment Systems: How They Work & Why They Matter

TL;DR

• Unlike a closed-loop card that just works at one retailer, an open-loop card or wallet is used anywhere that accepts the network it runs on – Visa, Mastercard, or similar.
• These systems strengthen public transport, smart cities, and retail by supporting multiple payment providers on shared card networks like Mastercard, Visa, and American Express.
• The global contactless payment market, which underpins open-loop payments, is expected to hit $164.15 billion by 2030, expanding at a 19.1% CAGR, according to Grand View Research.
• The biggest implementation challenges are infrastructure upgrades and coordinating multiple stakeholders (merchants, networks, and banks) – not just the core technology.
• Nimble AppGenie has delivered open-loop payment integrations across Visa, Mastercard, and RTP rails for eWallet clients in the USA, UK, Canada, and UAE – covering PCI-DSS scoping, card network API integration, and transit EMV certification.

Cash usage has dropped for basic payments as people keep debit and credit cards handy. Instant payments have also changed how users pay every day. 

During these changes, open-loop payment systems are one of the biggest reasons the experience has improved, and they are becoming the default expectation, not a premium feature. 

Experts at Nimble AppGenie have written this guide covering how open-loop payment systems work, implementation steps, real examples, verified market data, and the technology behind them, as well as projections that may already be obsolete. 

What is an Open Loop Payment System?

An open-loop payment system is an arrangement that allows a user to make payments with any resource, irrespective of it being from the same financial institution.

This means that irrespective of which bank the payment is made from, it will be settled in your account easily. With open-loop payment systems, you can make transactions between accounts from different banks, cards, or wallets.

The system is widely accepted across the globe and is used for a variety of payment methods such as credit cards, debit cards, prepaid cards, gift cards, etc. The best thing about this system is that it allows a merchant to process payments irrespective of which financial institution the payer uses.

Similarly, for the payer, it is easy to use any debit/credit card to make the payment, irrespective of which bank the payee uses.

With open-loop payment systems, daily transactions such as public transportation, grocery shopping, etc., become super convenient. Even the best mobile banking apps support open-loop payments as they open a new horizon for their users.

Key Terms:

• RTP (Real-Time Payments): The Clearing House US operates this interbank network for instant bank-to-bank transfers, which is distinct from card network authorization, which also happens in real time but over a different rail. 
• EMV: The global chip-card standard (Mastercard, Europay, Visa) that enables secure contactless and chip payments. 
• PCI DSS: The Payment Card Industry Data Security Standard, a compliance requirement for any system handling card data. 
• POS Terminal: Point-of-sale hardware and software that reads a card or device to start a transaction. 

How Big Is the Open-Loop Payment Market?

• The global contactless payment market, the technology underpinning most open-loop transactions, is on track to hit $164.15 billion by 2030 at a 19.1% CAGR, according to Grand View Research, and usage has increased gradually despite real implementation challenges:
• The global real-time payment market, particularly the infrastructure increasingly underpinning open-loop settlement, is predicted to grow from $17.57 billion in 2022 to $198.08 billion by 2030, a 35.5% CAGR, per Grand View Research.
• About 150 cities worldwide were recognized as planning to adopt open-loop EMV payments to replace legacy transit ticketing systems, per ABI Research’s original 2021 analysis. (Source: Enghouse Transportation, citing ABI Research.)
• The same 2021 ABI Research forecast predicted open-loop EMV contactless cards for transit ticketing would rise from 24.8 million to 136.9 million by 2025, a target year that has ended, so acknowledge this as past context on the trend’s orbit rather than a live 2026 figure.
• According to a Visa survey, approximately 2 in 3 people are expected to use contactless payment, either a card or a prepaid one not directly linked to their bank account.

Global trends in open-loop payments show that countries worldwide are adopting the model – if you own a business, it’s worth implementing. 

How Do Open-Loop Payment Systems Work?

An open-loop payment system allows users to pay with debit cards, credit cards, or wallets over a shared card network, with authorization and settlement happening in near real time.

It’s worth being accurate here: not all open-loop transactions run over “the RTP network,” especially – RTP is one specific interbank rail for direct bank transfers in the US.

Most open-loop card transactions instead run over card network rails (Mastercard, Visa, etc.), which authorize in real time but settle through a separate process.

Both approaches share the same objective: instant confirmation, delayed formal settlement. 

Below are the steps involved:

1. Initiating a Payment

The cardholder taps their phone, card, or wearable at the terminal. This can be any credit, debit, or prepaid card, as long as it uses an authorized card payment network. 

2. Transaction Authorization

Transaction details are sent to a payment gateway through a transaction processing system, where the information is encrypted for authentication. Tap transactions under a fixed limit generally need no further customer authorization. 

3. Verification and Approval

The encrypted information is shared with the card network to verify with the bank, which checks the account information and confirms enough funds before approving the transaction. 

4. Clearing and Settlement

The customer’s bank clears the funds, and they are settled into the merchant’s account after verification and approval – the difference between the merchant’s existing funds and the new transaction is settled formally, even if authorization has already happened immediately. 

5. Real-Time Notifications

The merchant and customer are notified within seconds of the transaction completing, making the process feel instant even where formal settlement takes longer behind the scenes. 

What Are Real-World Examples of Open-Loop Payment Systems?

Card payment networks, transit smart cards, mobile wallets, retail checkout, online gateways, and cross-border transfers are the six most common real-world applications:

1. Card Payment Networks

You can’t run a closed-loop payment system for standard debit/credit cards, as not every customer’s card is issued by the same bank. Card networks like Discover, Visa, American Express, and Mastercard accept open-loop cards. Most terminals today support Mastercard and Visa, regardless of issuing bank. See our full open-loop vs. closed-loop comparison for a direct breakdown. 

2. Mobile Wallets with Open-Loop Functionality

Wallets like Google Pay and Apple Pay let users add any card and pay at any accepting outlet, using the same technology supporting modern contactless payment systems at retail checkouts worldwide. 

3. Public Transport Smart Cards

A single card for all transportation needs, free from queues and slow ticketing; open-loop payment systems make this frictionless experience possible. 

4. Online Payment Gateways and Platforms

Users can pay with their preferred methods, and merchants can accept payments from anywhere, regardless of the customer’s financial institution – integrating an online payment gateway makes this accessible even for small businesses. 

5. Retail Payment Solutions

A retailer limited to one financial institution (as in closed-loop payments) loses customers who bank elsewhere. Open-loop infrastructure allows a single payment machine to process all payments. 

6. International Money Transfers

On open-loop platforms, the card payment networks are not restricted to one country or region. This enables international money transfers and cross-border transactions suitable for merchants of any size.

How to Implement an Open-Loop Payment System?

To implement open-loop payments in your business, you need to have clarity on how your business can use them and how you can make the most of them. Once you are sure that it will be a beneficial decision, you can move to implement the solution.

Here are the steps you need to take for a proper open-loop payments system implementation:

Step 1: Understanding Business Needs

When implementing any payment system, be it a closed-loop or open-loop, the first step you need to take is to identify the current needs of your business.

Identify where exactly in your business you need open-loop payment systems are required. The more clear you are about the implementation, the better results it can yield for you. 

Step 2: Identify Your Payment Network

To implement an open-loop payment system in your business, you need to have a payment network that gives you the ability to accept payments.

Potential payment networks can be Visa, MasterCard, or PayPal, depending on your requirements. When choosing a payment network, make sure they have global exposure, unbreachable security measures, and friendly transaction fees for better results.

Step 3: Becoming Familiar with Compliance

Before implementing an open-loop payment system, it is crucial to understand the regulatory requirements it requires. The system you integrate must be compliant with PCI DSS, a standard for secure card payments.

This is only one of the many different compliance requirements that may be required when implementing an open-loop payment system. 

Step 4: Establish Required Infrastructure

After you have understood the requirements and identified key partners in finding the right open-loop payment system partners, it is time to build an infrastructure that allows smooth integration.

You need a payment gateway, an app that gives you insights into the regular transactions, and a POS software that allows your users to interact with the open-loop payment system that you have implemented.

You can find an outsourced fintech development partner to guide you with a custom solution, or you can find an existing third-party tool that gets the job done. 

Step 5: Test and Iterate

Once you have got yourself an infrastructure to host open-loop payment services, the implementation is almost ready to be deployed.

The only thing you need to do is test the entire system and iterate on user feedback to achieve an optimal performance. This testing will help you understand the degree of efficiency.

When you have custom development experts, you can simply share your feedback, and they can make the changes, whereas with third-party software, changes based on feedback can be limited. 

Step 6: Go Live With Your Solution

With all of that, it is now time to make your open-loop payment system “open” for all! Go live with the solution that you have implemented and start using the system to identify its potential.

You can tweak the system as per your everyday usage, making it more customized to your needs. Using the solution will provide you with better insights into its effectiveness.

By performing these steps, you can get your hands on a well-defined open-loop payment system, allowing your business to make the most out of existing payment methods, while making it easier for the customers to stick to their preferred mode of payment.

What Are the Benefits of Open-Loop Payment Systems?

An open-loop payment system, when implemented properly, can do wonders for any merchant. From basic retail payments to public transportation, everyone around the globe is using open-loop payment systems.

There is no doubt that there are several benefits of open-loop payment systems.

Some of the most common benefits that you may find include:

1] Brings Inclusivity

Open-loop payment systems allow every individual who uses a card or a digital mode of payment to transact, making it a completely inclusive system.

You do not have to be a dedicated member of any bank or organization to be able to access the system; it is inclusive and open for all!

2] Adds Convenience

With open-loop payments, you have the flexibility of making payments anywhere without having to worry about unnecessary details.

Being able to pay for anything with your account, regardless of what bank the receiver uses, is a big convenience that open-loop payment systems offer.

3] Broadly Accepted

Open-loop payment systems are accepted by merchants globally, making it easier for consumers to buy goods and services anywhere in the world.

For example, if you are in a different country and only have a card to make all your payments, you can do the same at any merchant, thanks to open-loop payments.

4] Cost-Effective

Handling cash is not as easy as it appears. There are several types of costs that a merchant has to bear. Not only does this reduce the cost involved in cash handling, but it can also reduce the land cost of any ticketing infrastructure.

Simply enabling an open-loop payment system can help in reducing the handling charges, along with different infrastructure costs to nil.

If you get proper support from professionals, it may take you less time and cost to develop an e-wallet app that offers an open-loop facility than your legacy payment system.

5] Efficient & Secure

The method is efficient as it works on a shared network like the RTP network. This means that payments are settled in real-time, with instant confirmation from the associated banks and financial institutions.

The entire process uses the best encryption and security features, such as tokenization, fraud detection, etc., making it secure and safe in real-time.

6] Simplifies International Transactions

One of the key benefits of using open-loop payment systems is that it enables international transactions smoothly. A merchant can easily accept payments from a card belonging to a person from another country as long as they are on the same card payment network.

This has opened doors for even the smallest of businesses to reach a wider audience with the help of cross-border open-loop payments.

What Technology Powers Open-Loop Payment Systems?

Card network authorization rails, digital wallets, interbank real-time payment networks, payment gateways, and encryption work together to enable open-loop payments.

1. Card Network Authorization Rails

Card networks like Mastercard, Visa, American Express, and Discover connect a merchant’s bank with the cardholder’s bank for real-time authorization, functioning 24/7 regardless of standard banking hours.

2. Interbank Real-Time Payment Networks

Networks like RTP (in the US) and equivalents elsewhere handle direct bank-to-bank transfers with immediate settlement – increasingly relevant as open-loop systems grow beyond card rails into account-to-account payments. See our mobile payment technology overview for how these pieces fit together.

3. Digital Wallets

Digital wallet interfaces allow users to save payment details and cards, and transact without carrying a physical card or exposing their actual bank details. See our full breakdown of eWallet app features. 

Also Read: How to Create a Digital Wallet App?

4. Payment Gateways

Like offline POS terminals, payment gateways are online services allowing merchants to accept payments directly into their bank accounts, connecting merchants and banks regardless of customers’ financial institution. 

5. Encryption

Encryption converts sensitive information – banking information, card details – into code so it stays protected from unauthorized access throughout the transaction.

API integration for open-loop payment technology is comparatively easy for development teams and simple to implement.

What Are the Challenges in Implementing Open-Loop Payment Systems?

While the open-loop approach for payment seems the ultimate solution to all the hassle, it is not easy to implement. Several challenges often cause issues in the implementation of open-loop payment systems.

Let’s take a look at some of them:

Challenge #1: Better Coordination Among Parties

To solve coordination issues, all involved parties need a common framework. Banks, payment networks, service providers, and merchants should follow shared rules and standards.  

Additionally, using well-known payment networks and APIs can help different systems talk to each other easily. Also, regular meetings, clear roles, and legal agreements can help avoid confusion and delays.

Challenge #2: Increasing User Adoption

User adoption improves when people clearly understand the benefits. You can take simple steps like faster payments, shorter queues, and no need to carry cash. 

Pilot programs, awareness campaigns, and on-the-ground support can help users slowly adapt. You can offer both old and new payment options during the early phase to make the transition easier.

Challenge #3: Handling Technology Compatibility

To overcome compatibility issues, your systems should support multiple payment methods. You can include cards, QR codes, wearables, and basic mobile phones where possible.

Instead of forcing users to upgrade devices, service providers can design flexible systems that work with both old and new technologies. This ensures no user is left out.

Challenge #4: Respecting User Preferences

User comfort should always come first. Open-loop payments should be optional, not mandatory. You should allow users to choose between tickets, cards, or digital payments to build trust. 

Additionally, clear instructions, simple interfaces, and visible help points can reduce hesitation in crowded or public spaces.

Challenge #5: Managing Infrastructure, Cost, and Training

A phased rollout helps reduce cost and risk. Instead of replacing everything at once, you can upgrade the infrastructure step by step.

Besides, staff training should focus on basic system handling and issue resolution. You can partner with experienced payment providers that can reduce your investment burden and ensure compliance with regulations.

While the challenges may vary in different regions and sectors, the benefits do stay the same; implementing open-loop payment systems is a must for every merchant with an online/offline store.

How Nimble AppGenie Can Help Develop Open-Loop Payment Solutions

Nimble AppGenie offers eWallet app development services and has delivered open-loop eWallet and payment infrastructure projects for clients across the USA, UK, Canada, and UAE, including Visa and Mastercard open-loop integrations, transit tap-to-pay systems, and cross-border payment wallet builds.

The team handles the full stack: card network program setup, PCI-DSS scoping, gateway API integration (Stripe, Adyen, Checkout.com), and post-launch fraud monitoring. With 350+ fintech projects delivered, NimbleAppGenie brings implementation experience that reduces the coordination overhead between your bank, card network, and development team.

Conclusion

Open-loop payment systems are no longer a differentiator; they are the baseline expectation for any modern eWallet, transit platform, or retail checkout.

The growth trajectory is clear: $164 billion contactless market by 2030, 150+ cities migrating from closed-loop transit ticketing, and real-time payment rails expanding settlement speed across every major economy.

The real question is not whether to implement open-loop, but how to do it without getting delayed by PCI-DSS scoping, terminal certification timelines, or multi-stakeholder coordination. Nimble AppGenie has built that implementation process across 350+ fintech projects; if you have a use case and a timeline, then share, and the team will map out a realistic build path.

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Niketan Sharma

Niketan Sharma, CTO, Nimble AppGenie, is a tech enthusiast with more than a decade of experience in delivering high-value solutions that allow a brand to penetrate the market easily. With a strong hold on mobile app development, he is actively working to help businesses identify the potential of digital transformation by sharing insightful statistics, guides & blogs.