Digital Public Infrastructure: India Stack

How India built public digital systems for identity, payments and data sharing, and why other countries are studying the model.

Digital public infrastructure refers to shared digital systems, built or backed by the government, that anyone can use to build services. India’s set of such systems is often called India Stack.

The layers

Identity: Aadhaar, launched in 2009, gives residents a unique 12-digit number linked to biometric data. Over a billion people have been enrolled.
Payments: the Unified Payments Interface, launched in 2016 by the National Payments Corporation of India, lets people send money instantly between any bank accounts using a phone.
Data sharing: DigiLocker stores official documents digitally, and the Account Aggregator framework lets people share financial data with consent.

Why it matters

Because these systems are interoperable, meaning they work across different banks and apps, private companies can build services on top of them. Many payment apps, from large technology companies to banks, run on UPI. This encouraged competition and innovation.

UPI grew into one of the world’s largest real-time payment systems, processing billions of transactions every month. Combined with Jan Dhan bank accounts and Aadhaar, it allowed direct benefit transfers to deliver government payments straight to people’s bank accounts, reducing leakages.

A street vendor goes digital

A vegetable seller displays a UPI QR code. Customers pay instantly from any bank or app, with no fees for the vendor. The vendor builds a digital record of sales, which can later support a small loan. Shared public infrastructure made this possible without the vendor needing expensive card machines.

Debates and concerns

Privacy: storing biometric identity data raises concerns. In 2017, India’s Supreme Court recognised privacy as a fundamental right, and in 2018 it upheld Aadhaar with limits on its use.
Exclusion: people whose fingerprints fail to authenticate, including some older manual workers, have been denied services.
Accessibility: digital systems must work for blind users and people with low digital skills.
Concentration: a few apps dominate UPI transactions.

Global interest

Other countries have studied or adopted similar approaches, and India has promoted its model internationally, including during its G20 presidency in 2023.

Thinking digital infrastructure means only apps

The key innovation was public, shared systems that any company can build on, not a single app. This open design lets many providers compete while using common rails.

Key takeaways

India Stack includes Aadhaar for identity, UPI for payments and systems for data sharing.
Interoperable public systems let private companies build competing services.
UPI became one of the world's largest real-time payment systems.
Privacy, exclusion, accessibility and concentration are important concerns.