aspg-37-4451-1792223298 20261017074818 American Scientific Publishing Group admin@americaspg.com American Scientific Publishing Group Financial Technology and Innovation FinTechI 2836-5372 2025 5 2 Betul Aktas Higher Vocational School, Cag University, Mersin, Turkey Measures of financial-technology adoption often bundle devices, interfaces, accounts, and the payment instruments themselves, which can end up making the transformation of payment rails look bigger than it really is. In other words, it’s sort of easy to overstate what changed in the underlying payment rails when you mix everything together. This study builds a friction-aware measurement framework that separates instrument adoption, recent use, payment-count share, and the transaction context. We apply the framework to nationally representative, weighted U.S. consumerpayment tables that were available by 31 March 2025. The analysis follows eight payment instruments from 2015 to 2023, and then links their payment-count shares to consumer rankings of acceptance setup, convenience, cost, record keeping, and security. In 2023, credit and debit cards together made up 62.2% of payment transactions, while stored-value mobile-payment applications were below 1%. So widespread mobile-device adoption seems to have meant a change in the payment interface , not a direct replacement of the card and bank-account rails. Also, credit and debit cards show the highest use-depth ratios among recent users. In a two-way fixed-effects model, a one-standard-deviation decline in the convenience rank lines up with an 8.97-percentage-point drop in payment share (p = 0.0047); the other rankings, well, were not independently separable from zero. An expanding-window ridge model didn’t beat a persistence benchmark over 2021–2023, even though it did generate a lower forecast error in 2023. Overall the evidence suggests payment-rail transformation is driven by convenience, behavioral persistence, and transaction context rather than interface adoption only. Finally, the study offers a practical measurement architecture that financial institutions, payment platforms, and regulators can use when they’re trying to check for genuine rail substitution. 2025 28 34 4451 https://creativecommons.org/licenses/by/4.0/ 10.54216/FinTech-I.050204 https://americaspg.com/journal/37/article/4451 https://americaspg.com/storage/articles/manuscripts/01KXXQGB6ACPY7F865H7R7E5RK.pdf