More than a year after Chime Financial rang the Nasdaq bell in June 2025, the neobank's stock performance has become the clearest available case study in how public markets price a consumer fintech whose revenue leans overwhelmingly on debit-card interchange rather than lending, subscriptions or asset management. The shares priced above their range on debut and popped on the first trading day, validating years of investor appetite for a company that reaches a demographic - Americans living paycheck to paycheck - that traditional banks have historically found unprofitable to serve. The months since have been considerably choppier, tracking a broader repricing of fintech IPOs against slowing user growth assumptions. Chime, founded by Chris Britt and Ryan King in 2013, built its business on fee-free checking and savings accounts funded through Bancorp Bank and Stride Bank as chartered partners, monetising primarily through the interchange fees merchants pay on debit transactions. The company layered on early-paycheck access, a secured credit-builder card and modest overdraft-style advances called SpotMe, each designed to deepen engagement among a user base whose average account balance is thin but whose transaction frequency is unusually high. That volume-over-margin model let Chime reach profitability years before most consumer fintech peers, which was central to the IPO pitch. The competitive environment has intensified since listing. Cash App has pushed further into banking-adjacent features from its dominant peer-to-peer base, Varo Bank has continued building out its full-charter model, and traditional banks have introduced no-fee account tiers explicitly aimed at retaining lower-balance customers Chime might otherwise capture. Robinhood and PayPal have also encroached with cash-management products that blur the line between brokerage, payments and banking, widening the field of alternatives competing for the same underbanked and financially stretched consumer. The financial scrutiny that comes with quarterly public reporting has exposed the interchange model's sensitivity to two variables largely outside Chime's control: the Durbin Amendment's debit interchange cap structure, which does not apply uniformly to smaller issuing banks the way it does to giants, and the health of low-income consumer spending, which is more cyclically sensitive than the deposit bases of banks serving affluent customers. Analysts have focused heavily on active-member growth deceleration and on whether Chime's credit-builder and lending-adjacent products can diversify revenue quickly enough to offset any future narrowing of interchange economics. What to watch: whether Chime's active-member growth reaccelerates as it expands beyond its core paycheck-advance use case, how the stock trades through its first full earnings cycle covering a holiday spending season, and whether regulatory attention on overdraft-adjacent products like SpotMe intensifies under evolving CFPB guidance.