Scale Shifts Interchange Power to Fintech
Banking-as-a-Service: Monetization, Competition, and Growth in the Fintech Fastlane
The key dynamic is that scale shifts bargaining power upward to the fintech, not the BaaS layer. The fintech owns the app, the brand, and the user behavior that actually drives card swipes, so once volume gets large it can demand more of the interchange pool or move to a lower take rate model. BaaS still matters because it brings the bank, compliance, processor coordination, and faster launch, but those services become easier for a big customer to price and negotiate.
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In a typical card program, the fintech already takes the largest share because it brings the customer and the spend. In the B2B example, about 1.5% can go to the fintech out of 2.5% interchange, leaving the rest for the BaaS provider, sponsor bank, network, and other infrastructure players to split.
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As programs scale, the lower layers get compressed first. Issuing bank fees can fall from roughly 20 to 30 basis points to 2 to 3 basis points at scale, and BaaS platforms often give up rate on renewal to keep big accounts. Marqeta is the clean example, with take rate falling from about 0.7% in 2019 to 0.5% in 2020 as volume surged.
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This is why large fintechs often graduate away from full stack BaaS. A startup will trade revenue share for speed, because one provider can bundle bank relationships, compliance, and processor setup. A scaled program has more resources, so it can go closer to processors and banks directly, keep more interchange, and take back control of roadmap and economics.
Going forward, the winning BaaS companies will be the ones that earn margin from more than just taking a slice of interchange. The durable position is to become the fastest and safest operating layer for launch, compliance, fraud controls, and multi product expansion, then keep breakout customers even as pure interchange splits tighten.