Embedded payments can be your
largest revenue line — or your largest constraint.
The program model, bank structure, and economics are designed before the build — or they default to whatever your first vendor offered. ExpandUp helps you define the architecture that determines your economics before infrastructure selection constrains your options.
First conversation: 30-minute architecture diagnostic. No cost. No commitment.
The situation most fintechs are in when they call us
"We want to launch a fintech payments product but haven't defined the program model"
BaaS, direct MTL, or hybrid — the model decision determines your margin ceiling, compliance exposure, and long-term flexibility. It needs to be made before the first vendor call.
"We're building a payments feature and have already talked to a BaaS provider"
You've had the demo. The economics haven't been modeled. The program model hasn't been defined. Infrastructure was selected before the program model existed.
"We launched on BaaS and the unit economics aren't working at our current volume"
BaaS pricing that worked at $10M monthly becomes untenable at $50M+. The model needs to be stress-tested against your volume trajectory and restructured before scale makes it harder.
"Our interchange is lower than projected and we don't know why"
BIN structure, card type, Level 2/3 data transmission, and revenue sharing terms were all set by vendor defaults. None of them were designed. The gap is recoverable.
"We need a sponsor bank and don't know how to structure that conversation"
Walking into a bank conversation without a prepared program model, compliance framework, and commercial term requirements means the bank's defaults define your economics.
"We're building a card program and compliance requirements keep surfacing mid-build"
KYC/KYB design, BSA/AML obligations, and bank examination requirements need to be defined before infrastructure is selected — not discovered after contracts are signed.
Where most teams are — and where the decisions actually happen.
Most programs move through these stages. The architecture decisions that determine your economics happen earlier than most teams expect — and the cost of skipping them surfaces later than most teams expect.
| Stage | What Most Teams Think | What Actually Matters | ExpandUp's Role |
|---|---|---|---|
| Exploring | "We should add payments." | Program model definition — which model fits your economics, compliance exposure, and growth trajectory. | Define the program model before any vendor conversation begins. |
| Vendor Demos | "Stripe looked easy. BaaS was fast." | Economics and compliance — the commercial terms you need, the compliance obligations you're taking on, and whether this vendor's defaults match your model. | Evaluate vendors against the architecture — not the other way around. |
| Build Phase | "We're integrating APIs." | Operating model — reconciliation, exception handling, onboarding infrastructure, payment orchestration. The operational layer that makes the program usable. | Design the operational layer alongside the technical build — not after launch. |
| Launch | "Payments are live." | Reconciliation and controls — whether the program actually functions in real workflows and whether the economics are capturing as designed. | Verify the economics are live and the operational layer is functioning before calling the launch complete. |
| Scale | "Margins are lower than projected." | Architecture restructuring — identifying where the economics ceiling was locked in and what it takes to recover the margin your volume should be generating. | Diagnose the structural cause and design the recovery path — before the gap compounds further. |
We sit between the program and the infrastructure.
We are not a vendor. We are not a broker. We do not refer fintechs to banks or take placement fees. We design the program — and then help you execute it. We sit on your side of the table. Our mission →
Six capabilities. One architecture.
When fintechs work with ExpandUp
Fintech programs that skip revenue architecture are leaving interchange, float, and fee revenue in the infrastructure layer.
The interchange capture structure, float economics, and fee design are decided at the architecture stage. Most fintechs inherit vendor defaults on all three — and the economic ceiling gets constrained before the program launches.
See how we design payments revenue →Engagement model
Design the program before the constraints lock in.
Every fintech embedded finance program starts with an architecture decision. The question is whether you make it intentionally — or let vendor selection define it by default.