Interchange Economics Shift to Fintechs

Scale shifts bargaining power to the company that owns the cardholder and the spend. Once a fintech or brand is driving billions of dollars of volume, the BaaS layer becomes easier to pressure on price because the customer can threaten to switch providers, bring pieces in house, or negotiate directly with sponsor banks. That is why interchange economics move up the stack even as the total dollars earned by BaaS providers can still rise with volume.

• The split starts thin for infrastructure players. In a typical consumer debit program, the network might take about 0.5 percent, the bank about 0.2 percent, and the BaaS provider only about 0.12 percent, with the fintech keeping more. At larger scale, sponsor bank economics can fall from roughly 20 to 30 basis points to 2 to 3 basis points.
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• This happens because the fintech is doing the expensive part. It acquires users, drives card spend, and often brings deposits the bank would not have won itself. In B2B programs, research shows fintechs can capture roughly 1.5 percent of a 2.5 percent interchange pool, leaving the rest to be shared across the bank, network, and infrastructure providers.
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• Marqeta is the clearest example of the tradeoff. Big customers like Cash App and Instacart created huge volume, but Marqeta's take rate fell from about 0.7 percent in 2019 to 0.5 percent in 2020 and lower after that. The provider keeps the logo value and volume growth, but gives up margin to retain breakout customers.
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The next phase of BaaS is less about defending a fixed interchange cut and more about earning a durable role through software and operations. Providers that add fraud tools, ledgering, compliance workflows, and multi bank orchestration can stay in the stack even as raw interchange share compresses, because they are selling less of a toll and more of an operating system.