BaaS Platforms Feed Card Infrastructure
Banking-as-a-Service: The $1T Market to Build the Twilio of Embedded Finance
This reveals that many BaaS platforms are distribution layers, not pure infrastructure, and that makes them customer acquisition engines for deeper card and payments vendors. A company can buy one BaaS API to launch a debit card or account quickly, while the BaaS provider quietly routes card issuing to processors like Marqeta, Lithic, or Highnote. The easy front door at the BaaS layer therefore pushes transaction volume and interchange economics down to the infrastructure layer as embedded finance adoption grows.
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The practical split is simple. BaaS platforms handle sponsor bank access, compliance workflows, and the packaged developer experience. Issuer processors sit closer to the card networks and run the mechanics of authorization, clearing, settlement, and card program orchestration. Treasury Prime has been described as using Marqeta underneath, and Unit as using Visa DPS.
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This is why modular stacks matter. As customers scale, they often want finer control over KYC, ledgering, transaction monitoring, physical card setup, or new credit products. That is where point solutions like Lithic and Highnote become attractive, because they let a fintech swap in a stronger card engine without rebuilding the whole banking program.
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The money flow explains the partnership. BaaS providers aggregate many customers and bring processors and banks incremental volume, which improves their leverage with suppliers. But each extra vendor in the stack also takes a cut, so scaled programs have an incentive to move from all in one BaaS toward more direct processor relationships to keep more interchange and reduce operational handoffs.
Over time, the stack is likely to separate more cleanly. All in one BaaS platforms will keep winning the first launch because they remove setup pain, while processors like Marqeta, Lithic, and Highnote will win more of the mature volume as card programs become strategic and customers want better economics, more configurability, and tighter control over the core payments engine.