Big Fintechs Internalize BaaS Stack
Fintech Fastlane: The Unit Economics of the Banking-as-a-Service Toll Road
The key risk is that the best BaaS customers eventually learn enough volume and enough complexity to stop renting infrastructure and start owning it. That is what the Dropbox analogy captures. Dropbox first used outside cloud vendors, then moved most user data onto its own custom built infrastructure and said the shift lowered unit costs at scale. In BaaS, the same logic appears when a large fintech decides the interchange it shares, the roadmap control it gives up, and the vendor margin it pays are now big enough to justify building more of the stack itself.
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This pressure is strongest with large fintechs, not embedded finance customers. Fintechs treat card issuing, accounts, and money movement as the product itself, so shaving even a few basis points matters. Embedded finance customers usually use BaaS to support another core workflow, so they have less reason to internalize the stack early.
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BaaS providers sit on top of multiple third parties, banks, issuer processors, KYC vendors, and networks. Interviews across the stack describe how platforms like Treasury Prime or Unit can rely on processors such as Marqeta or Visa DPS underneath, while others build more in house to improve cost structure and control. That makes vertical integration a real margin lever.
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Marqeta shows both sides of the tradeoff. Its scale and reliability helped it win very large programs, and Block made up 73% of net revenue in the first half of 2021. But that same concentration means the largest customers gain pricing power, which is why take rates tend to fall as volume scales.
The market is likely to split in two. The biggest fintechs will keep pulling more issuing and banking functions in house or toward lower level providers, while the winners in BaaS will serve the long tail with faster launch, bundled compliance, and enough modularity that customers can expand without fully leaving. Over time, BaaS looks less like a permanent home and more like an on ramp that must keep adding value as customers mature.