Sponsor Bank Determines Interchange Economics
Founder of neobank company on the importance of picking the right sponsor bank
The real fight in BaaS is over who keeps the interchange dollars after the swipe. Debit interchange starts small, around 1.3% for exempt banks, and that pool still has to cover the network, sponsor bank, processor, and platform. When a BaaS provider inserts itself as program manager and keeps a share before paying the fintech, the startup can end up with economics that are too thin to fund rewards, free checking, or customer acquisition.
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The common all in one model is not pure software pricing. Many platforms make money from a mix of interchange split, monthly platform fees, and per account or per transaction fees. That makes passthrough rare, because the platform is using interchange as one of its main revenue streams, not just billing separately for software.
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The difference between passthrough and take a cut is concrete. In a passthrough setup, the fintech negotiates economics with the sponsor bank and keeps most of the gross interchange, while paying the platform mostly through explicit fees. In a managed setup, the platform receives interchange first, subtracts its costs and margin, then shares the remainder.
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This is why direct bank access matters so much at scale. Internal research shows the fintech usually deserves the biggest share because it owns the end customer and drives spend, and larger programs can push the bank take rate down to a few basis points. The more layers sitting between fintech and bank, the more room there is for hidden margin.
Going forward, the winning BaaS model is likely to separate software fees from economics sharing more cleanly. As fintechs get larger and more price aware, they will push for direct sponsor bank relationships, clearer term sheets, and near passthrough interchange, while platforms that still depend on opaque revenue sharing will be forced to compete on real product value, speed, and compliance execution.