Durbin Amendment Enabled Chime Growth

This rule is the economic engine that made U.S. neobanks viable before they had lending or subscription revenue. The Durbin amendment caps debit interchange for issuers with $10B or more in assets, while smaller issuers stay exempt, so fintechs like Chime partner with banks like Bancorp and Stride, route debit card volume through those banks, and split a richer fee pool than a JPMorgan sized bank could earn on the same swipe.1 2 3 4 5

• In practice, the merchant pays the card acceptance fee, the network takes its piece, the sponsor bank takes its piece, and the fintech gets the rest for owning the app, the brand, the direct deposit relationship, and the customer support. That is why Chime could scale on debit usage without charging traditional bank fees.2 3 5
• The small bank exemption created a real arbitrage. Internal research on BaaS economics shows exempt sponsor banks could earn materially higher debit interchange than large banks, then give up much of that spread to fintech partners and still keep an attractive asset light revenue stream.2 4
• This also explains why Chime stayed a fintech instead of becoming a bank early on. A charter could let it keep more of the economics, but once an issuer crosses the $10B asset line, the debit cap applies, and the company also takes on far more compliance, supervision, and operating complexity.1 3 5

Over time, the companies that win from this model move beyond pure debit. Chime has already been adding credit, lending, and more owned infrastructure, because the long term path is to use exempt debit interchange as the customer acquisition wedge, then layer on products with higher revenue per user and more control over margin.3 5