Interchange Advantage from Small Banks

The real advantage was not better card economics created by software, it was access to a different regulatory bucket of banks. Once a fintech used a sponsor bank under $10B in assets, the debit interchange cap that applied to large banks no longer applied, so a swipe that might be capped at roughly 21 cents plus 5 basis points at a big bank could clear at roughly market rates instead. That larger gross pool let the sponsor bank cut its own take to 2 to 3 basis points and still leave more money for the BaaS platform and fintech.

• In practice, this changed who could afford to be generous in the revenue split. Small sponsor banks like Sutton, Cross River, and similar partners could hand back far more interchange because they were starting from a bigger fee pool than Wells Fargo or Chase would have under Regulation II.
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• That is why early neobanks and card programs were so interchange heavy. The fintech owned the app, user acquisition, and card spend. The BaaS layer handled program management and processing. The bank supplied the charter. Because the bank share compressed as volume scaled, more of the economics migrated upward to the fintech brand.
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• The catch is that this was always a threshold driven advantage, not a permanent product moat. Cross River itself flags that moving past the $10B asset line would reduce profitable debit interchange income, showing how much of the model depended on remaining on the exempt side of the line.
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The market is moving toward BaaS providers and fintechs that can make money even after this debit interchange edge narrows. The winners will be the ones that use cards to acquire customers and data first, then layer on deposits, lending, software fees, and more regulated workflows so the business still works when interchange becomes less favorable.