India’s Unified Payments Interface processed 16.6 billion transactions in January 2025, worth approximately $250 billion. Five years earlier, in January 2020, UPI processed 1.3 billion transactions. The growth from 1.3 billion to 16.6 billion monthly transactions in five years represents the fastest adoption of digital payment infrastructure in history. UPI was not built by a private company. It was built by the National Payments Corporation of India as public infrastructure, available to any bank or fintech company that meets the technical requirements. A street vendor in Mumbai accepting payments through a QR code printed on cardboard uses the same payment infrastructure as Amazon India. That is what happens when payment infrastructure goes digital: it becomes universal.
The digitisation of payment infrastructure is a global phenomenon, not an Indian exception. According to Statista’s global digital payments forecast, digital payment transaction volume will reach $36.09 trillion by 2030. The Grand View Research digital payments report values the payment solutions market at $114.41 billion in 2024, projected to reach $361.30 billion by 2030 at a 21.4% CAGR. The investment is flowing into infrastructure, not just applications. The pipes through which money moves are being rebuilt in digital form.
What Payment Infrastructure Means
Payment infrastructure is the set of systems, networks, and protocols that enable money to move from one party to another. It operates at three levels.
The Boston Consulting Group projects fintech revenues will reach $1.5 trillion by 2030, with embedded finance and digital lending accounting for the largest share of projected growth.
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The clearing and settlement layer handles the actual movement of money between financial institutions. In most countries, this layer is operated by central banks or central bank-authorised entities. The Federal Reserve’s FedNow (launched July 2023), the European Central Bank’s TARGET Instant Payment Settlement (TIPS), India’s UPI, and Brazil’s Pix are all clearing and settlement systems that process payments between banks in real time.
The processing layer sits above clearing and settlement. Payment processors like Stripe, Adyen, Worldpay, and Fiserv route transactions from merchants through card networks (Visa, Mastercard) or directly to bank-to-bank payment systems. This layer handles authorisation (checking that the payer has sufficient funds), fraud screening, and routing decisions.
The access layer is the interface through which customers and businesses interact with the payment system. Mobile wallets (Apple Pay, Google Pay), point-of-sale terminals, e-commerce checkout pages, and banking apps are all access layer technologies. This is the layer most visible to users, but the value and complexity sit in the layers below.
The digitisation of payment infrastructure is happening across all three layers simultaneously. Central banks are building real-time settlement systems. Payment processors are shifting from batch processing to real-time, API-based architectures. Access technologies are moving from hardware terminals to software-based solutions running on smartphones.
Real-Time Payment Systems: The Foundation
The most consequential change in payment infrastructure is the proliferation of real-time payment systems. These systems enable instant, irrevocable transfers between bank accounts, 24 hours a day, 365 days a year. They replace batch-processed systems where payments were accumulated during the day and settled overnight.
India’s UPI is the most successful implementation. Launched in 2016, it now processes more digital transactions than all card payments in the United States combined. The system is interoperable across all participating banks and fintech companies. A customer of any bank can pay a merchant that uses any other bank, instantly and for free. The zero-cost-to-consumer model is funded by the government and cross-subsidised by other banking services.
Brazil’s Pix, launched in November 2020, reached 150 million registered users (70% of Brazil’s adult population) within three years. Pix processes over 4 billion transactions per month. Like UPI, it is operated by the central bank and is free for individual users. Pix has displaced cash as the preferred payment method in Brazil, with even street vendors and taxi drivers accepting Pix payments via QR code.
The United States launched FedNow in July 2023, bringing real-time payment capability to the world’s largest economy. Adoption has been gradual: as of early 2025, approximately 1,000 financial institutions were connected, out of over 9,000 eligible. The US also has The Clearing House’s RTP network, which launched in 2017 and now reaches approximately 75% of US demand deposit accounts. The presence of two competing real-time payment networks in the US reflects the complexity of modernising payment infrastructure in a market with thousands of banks and deeply entrenched card network dominance.
API-First Payment Processing
The processing layer is being rebuilt around APIs (application programming interfaces). Traditional payment processing required merchants to work with acquiring banks, install hardware terminals, and manage complex integrations with multiple payment networks. API-first payment platforms replace this complexity with a single integration point.
Stripe pioneered this model. A developer can integrate Stripe into a website or application with a few lines of code and immediately accept payments from customers in 195+ countries using 135+ currencies and dozens of local payment methods. The complexity of routing, fraud screening, currency conversion, and regulatory compliance is handled by Stripe’s infrastructure, invisible to the merchant.
Adyen built a similar API-first platform for enterprise merchants. McDonald’s, Spotify, eBay, and Microsoft use Adyen to process payments across physical stores, online platforms, and mobile apps through a single integration. Adyen’s unified commerce approach means a customer who starts an order online and completes it in-store has a seamless payment experience, with all transaction data flowing through one platform.
The API-first model has created a new category of payment infrastructure company. Marqeta provides card issuing through APIs, allowing companies like DoorDash, Block (Cash App), and Affirm to issue their own payment cards without building card issuing infrastructure. Galileo (owned by SoFi) provides similar API-based payment infrastructure to fintech companies. These platforms make it possible for any company to embed payment capabilities into their products without becoming a payments company themselves.
The Economics of Digital Payment Infrastructure
Digital payment infrastructure changes the economics of moving money in three measurable ways.
Transaction costs decline as infrastructure digitises. A cash transaction has hidden costs: armoured car transport, vault storage, counting, counterfeiting risk, and theft. The Federal Reserve estimates that cash handling costs US businesses approximately $55 billion annually. Card transactions cost merchants 1.5% to 3.5% in processing fees. Real-time bank-to-bank payments through systems like UPI and Pix cost merchants a fraction of a percent or nothing. As payment infrastructure shifts to real-time systems, the average cost of processing a payment falls.
Settlement speed improves from days to seconds. Traditional card payments settle in one to three business days. Real-time payment systems settle instantly. For merchants, faster settlement means better cash flow. For consumers, faster settlement means immediate availability of transferred funds. For the financial system, faster settlement means less counterparty risk and less capital tied up in transit.
Data generation increases with every digital transaction. Cash produces no data. A digital payment produces a detailed record: amount, merchant, category, time, location, device, and customer identity. This data feeds fraud detection models, personalisation engines, lending algorithms, and business analytics. The value of payment data often exceeds the value of the payment processing fees themselves, which is why companies like Square and Stripe have built lending, analytics, and financial management products on top of their payment data.
What Comes Next
Three developments will define the next phase of payment infrastructure digitisation.
Central bank digital currencies (CBDCs) are being developed by over 130 central banks globally. China’s digital yuan (e-CNY) is the most advanced, with over 260 million wallets and cumulative transactions exceeding $250 billion through pilot programmes. The European Central Bank is developing the digital euro. CBDCs represent government-issued digital money that settles on central bank infrastructure, potentially bypassing both card networks and private payment platforms.
Cross-border interconnection of national real-time payment systems will create an alternative to correspondent banking for international transfers. The India-Singapore UPI-PayNow link is operational. ASEAN countries are building a regional interconnection. These links will enable cross-border payments at domestic speed and cost, eliminating the fees and delays of the correspondent banking system.
Programmable payments, where payment instructions include conditional logic (pay this invoice when the goods are delivered, release the escrow when both parties confirm, adjust the subscription amount based on usage), will add a new capability layer to payment infrastructure. Smart contracts on blockchain networks already enable programmable payments. As traditional payment infrastructure incorporates similar capabilities, the boundary between payments and business logic will blur.
The digitisation of payment infrastructure is not a trend that will peak and recede. It is a one-way transition, like the shift from paper records to databases or from postal mail to email. Every country, every financial institution, and every business will eventually operate on digital payment rails. The only question is speed of adoption, and the data from India, Brazil, and China shows that when the infrastructure is built well, adoption can be explosive.
