Vertical SaaS monetizing money movement

The real unlock was turning software from a fixed subscription into a toll booth on customers' money movement. Once a vertical SaaS company sits inside invoicing, checkout, payouts, or cards, it can earn on every transaction, capture more of the customer workflow, and use lower margin payments to pull users into higher value products like lending, payroll, or banking.

• Bonsai framed the shift as moving from software that tracks work to software that also controls cash flow. In practice that means not just charging per seat, but taking revenue share on payment processing, interchange on issued cards, and potentially fees from faster payouts, floats, or credit products.
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• Toast and Shopify are the clearest comparables because payments is not just an add on for them. In research on platform payments, Toast was described as getting almost 80% of revenue from payments, showing how a software company can make most of its money from the financial layer once it owns merchant transactions.
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• This works best in verticals with messy money flows. Restaurants need tip routing and staff payouts. Travel platforms need installment collection and multi party disbursements. Those are jobs a generic processor does not fully solve, which lets the software provider charge for both the workflow and the money movement.
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The next step is deeper bundling. Payments gets the platform into the flow of funds, then lending, payroll, expense management, and stored balances become easier to layer on top. That is why vertical SaaS is steadily turning into vertical ERP, where the winning products do not just organize a business's work, they increasingly operate its bank account in the background.