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Available 26 August 2026India Print Edition & Kindle: IN, US, UK

Penguin Random House

Cashless
NationHow UPI Changed Everything

Santanu Paul

B. Sambamurthy

A definitive ringside view of how India built the world’s most consequential digital payments system and reshaped its relationship with money. In a lucid, fast-paced narrative, Cashless Nation traces the personalities, bold ideas, institutional grit, and quiet breakthroughs behind this transformation. A compelling ringside view of India’s technological ascent; essential reading for anyone seeking to understand its rise as a superpower in the twenty-first century.

Endorsed by Stalwarts

FROM THE FOREWORD
Nandan Nilekani
Nandan Nilekani
Founding Chairman, UIDAI and Honorary Adviser, NPCI
[The] Unified Payments Interface, or UPI, has emerged as an undisputed superstar… None of this was an overnight success. The evolution took decades and gathered serious momentum only in the last decade and a half… Cashless Nation is a chronicle of that remarkable journey and the many personalities, incidents and obstacles along the way. It traces the major debates, the critical trade-offs, the complex choices… It explains why India chose to build public rails for private innovation, a model that delicately balances sovereign control with market vitality…

Cashless Nation, with its fast-paced storytelling style, is also remarkable because of its authors… They had a ringside view of all that transpired on the ground, which has given their narrative its unique flavour and distinctive energy. For policymakers, technologists, entrepreneurs and business leaders around the world, this book should serve both as an interesting read and a reference model.
C. Rangarajan
C. Rangarajan
Former Governor, Reserve Bank of India
Cashless Nation is a brilliant narrative of the events, policies and personalities that contributed to the emergence of UPI, an envy of the world now, and open to everyone from a street vendor to a billionaire. What is most attractive is the way the story is told with interesting flashbacks, spicy anecdotes and valuable insights, making it at once educative and entertaining.
N.R. Narayana Murthy
N.R. Narayana Murthy
Founder, Infosys
Technology is a great leveller, and UPI is a prime example of how India used it to improve financial inclusion for its citizens. Simple, affordable and accessible digital payments have enabled millions to join the mainstream economy and access formal credit. In Cashless Nation, Santanu and Sambamurthy show how various stakeholders contributed to UPI's huge success. The book unveils the UPI origin story in vivid detail and illuminates how it changed India forever.
Raj Reddy
Raj Reddy
Moza Bint Nasser University Professor of Computer Science and Robotics, Carnegie Mellon University, and winner of the Turing Award 1994
Cashless Nation is the story of India's long journey from the stifling darkness of the license raj to the dazzling light of Digital Public Infrastructure. Empowered by prime ministers like Manmohan Singh and Narendra Modi, visionaries such as Nandan Nilekani have created open protocols that facilitate citizen transactions at a billion-person scale. Santanu Paul and B. Sambamurthy offer a highly readable account of a national transformation. A must-read for everyone who is amazed at the magic of instant any-to-any cashless payments, made possible by UPI.
V. Anantha Nageswaran
V. Anantha Nageswaran
Chief Economic Adviser, Government of India
200 billion payments a year, racing toward a billion a day — UPI is the largest thing of its kind any nation has built. India's payments revolution was neither grand design nor lucky accident but the patient accretion of choices made across four decades and many rooms. In Cashless Nation, Paul and Sambamurthy tell that story with rare clarity and warmth. A superb account of an Indian achievement and a chronicle of how a nation quietly rewrote its relationship with money.
Rahul Chari
Rahul Chari
Founder and Chief Technology Officer, PhonePe
Open, interoperable digital rails built as public goods, with private innovation on top, may be one of India's most important contributions to the digital world. Cashless Nation is much more than the story of UPI. It is a blueprint for bringing together the vision, institutions and execution required to transform India at scale.
Soumya Swaminathan
Soumya Swaminathan
Former Deputy Director-General and Chief Scientist, World Health Organization (WHO)
Cashless Nation is a fascinating read of the almost-miraculous story of UPI, of a billion people becoming digitally connected and a part of the formal economy. The authors, having seen it up close, describe India's journey to digital empowerment and turn the spotlight on the people and institutions behind it.
Sundararaman Ramamurthy
Sundararaman Ramamurthy
Managing Director and Chief Executive Officer, Bombay Stock Exchange
Cashless Nation is a gripping insider account of how UPI transformed India into a global powerhouse of digital finance. With rare clarity and authority, it captures the vision, policy ingenuity and execution that made inclusive, real-time payments a national reality. A must-read for anyone interested in the future of money, innovation and financial inclusion.
G.V. Prasad
G.V. Prasad
Co-Chairman and Managing Director, Dr. Reddy's Laboratories
Cashless Nation paints an evocative picture of how India's success in creating Digital Public Infrastructure for moving money securely and efficiently has helped the nation expand financial inclusion to unprecedented scale and impact. The book captures, in rich narrative detail and with sharp analysis, the interplay of policy, technology and vision that made UPI a pioneering platform.
V. Kamakoti
V. Kamakoti
Director, IIT Madras
Digital finance drives the economy and prosperity of modern nations. UPI has become the global role model for payments and is making an indelible mark in the economic growth of Bharat. Cashless Nation, by Santanu Paul, an Indian Institute of Technology Madras alumnus, and B. Sambamurthy, is an invaluable book that narrates the behind-the-scenes story of UPI's success.
Vishal Dhupar
Vishal Dhupar
Managing Director, Asia South, NVIDIA
Cashless Nation is more than the story of UPI. It is a stirring account of how India built trust at population scale through digital public infrastructure, thoughtful policy and long-term commitment. Santanu and Sambamurthy capture the ideas and decisions behind one of the most significant transformations in modern India. As countries around the world study India's digital rise, this book offers valuable lessons in building open, inclusive and scalable systems.
About the Book

A Story of National Transformation

Cashless Nation traces how India built UPI, the world's largest real-time digital payments platform, and reshaped the relationship between technology, finance, and citizenship.

200 B+
UPI transactions annually
500 M+
citizens touched by UPI
65 M+
merchants enabled by UPI
>50%
India's share of global digital payments
First Pages

A Sneak Peek

Parts
Chapters
Part 1

No Longer Legal Tender

Chapter 1

It was 8 November 2016, and the day had felt like any other. Barely ten days had passed since Diwali, and India was beginning to emerge from its after-effects. Diwali motivates and excites Indians like no other festival. From lighting oil lamps to setting off colourful fireworks, from buying shiny gifts to wearing new clothes, from scrubbing homes to gorging on sweets, Diwali is an opportunity to indulge in jubilant and boisterous excess. The celebrations of 2016 had been no exception.

The Authors

Santanu Paul

Santanu Paul

Santanu Paul is a computer scientist and entrepreneur who sees technology as a force for public good. From research labs to startups to technology firms, he has chased wicked problems in enterprise systems, edtech, fintech and governance across the world. He was the founding CEO of TalentSprint, a deeptech upskilling platform focused on youth and gender inclusion. As a board member at NPCI, BSE and other financial institutions, he has participated in pivotal closed-door conversations where policies bump into platforms, and helped advance India's digital transformation infrastructure through his deep commitment to open architecture, rapid innovation and global frameworks. He holds a BTech from IIT Madras and a PhD from the University of Michigan.

B. Sambamurthy

B. Sambamurthy

B. Sambamurthy is a career banker who has witnessed technology democratize finance and transform livelihoods. His four-decade career arc spans from managing local and overseas branches to leading a public sector bank, evolving from a specialist into a foundational institution builder. He spearheaded operating models for large-scale digital transformation, notably leading the multidisciplinary team that innovated a biometric-driven branchless banking model for remote villages. As CEO of IDRBT and later as the RBI nominee director at NPCI, he helped shape India's electronic payments architecture. A Chartered Accountant, he has served on multiple financial infrastructure boards across banking, insurance, and capital markets.

Events

Global Book Launch

Book launch by

Nandan Nilekani

Co-founder and Chairman of Infosys,
Founding Chairman of UIDAI and
Honorary Adviser, Innovation and Public Policy, NPCI

Date
9-11 September 2026
Venue
Jio World Centre, Mumbai
Event
Global FinTech Fest 2026

Book Launch Events in other Cities

Hyderabad
Saturday, 12 Sep 2026
IIIT Hyderabad
Bengaluru
Saturday, 26 Sep 2026
Taj MG Road, Sangam
Chennai
Monday, 5 Oct 2026
IIT Madras
Delhi
Friday, 9 Oct 2026
India International Centre
Kolkata
Saturday, 31 Oct 2026
Bengal Club
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Cashless Nation: How UPI Changed Everything book cover

Available 26 August 2026India Print Edition & Kindle: IN, US, UK