Which UPI app is approved by RBI?

The Reserve Bank of India (RBI) grants regulatory approvals for entities involved in the digital payments ecosystem. For instance, Paytm Payments Services has received 'in-principle' approval from the RBI to operate as an Online Payment Aggregator, demonstrating RBI's oversight and authorization within this sector. All UPI applications function under the regulatory framework established by the RBI and the operational guidelines set by the National Payments Corporation of India (NPCI).