UPI should be treated first as payment infrastructure, not as a single product business. The rail reduces friction between accounts and apps. The commercial opportunity appears around distribution, merchant services, credit, data-enabled workflows and adjacent financial products.
Transaction scale is real. The exact distribution of cost and profit across participants is harder to infer from volume alone.
The deeper story is therefore about value capture around public or low-cost infrastructure. A payment can be cheap at the point of use while still creating valuable customer relationships and operational data.
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Next question
Which participant bears which marginal cost as transaction volume grows, and how does that affect the sustainability of the zero-charge experience?