Government of India has clarified that there is no plan to levy any charges for UPI services.

August 23, 2022

In a series of tweets, Finance Ministry said, UPI is a digital public good with immense convenience for the public and productivity gains for the economy. The clarification came amid some reports that there may be possibility of UPI transactions charge.
The Ministry said, the concerns of the service providers for cost recovery have to be met through other means.
It said, the government had provided financial support for the Digital Payment ecosystem last year and has announced the same, this year as well to encourage further adoption of Digital Payments and promotion of payment platforms that are economical and user-friendly.

Unified Payments Interface (UPI):

It is an advanced version of Immediate Payment Service (IMPS)-round–the-clock funds transfer service to make cashless payments faster, easier and smoother.
UPI is a system that powers multiple bank accounts into a single mobile application (of any participating bank), merging several banking features, seamless fund routing & merchant payments into one hood.
UPI is currently the biggest among the National Payments Corporation of India (NPCI) operated systems including National Automated Clearing House (NACH), Immediate Payment Service (IMPS), Aadhaar enabled Payment System (AePS), Bharat Bill Payment System (BBPS), RuPay etc.
The top UPI apps today include PhonePe, Paytm, Google Pay, Amazon Pay and BHIM, the latter being the Government offering.
As part of an agreement, India’s UPI will be linked to Singapore’s PayNow.
NPCI launched UPI with 21 member banks in 2016.