PhonePe and Google Pay dominate headlines on UPI market share, but regulation requires them to route 100% of their traffic through partner banks. The actual processing work happens one layer deeper, inside a network of B2B enterprise software providers.
At the bank level, legacy infrastructure is dominated by players like Mindgate Solutions and FSS, which build UPI switch systems inside major banks. Global player ACI Worldwide supplies rails for bank-to-bank settlement.

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