Payment processors with better economics at scale for SaaS
Patrick Huynh
CEO
Processing costs are only one part of your payment economics. Two SaaS platforms can process the same volume at similar transaction rates and still end up with very different payment profits depending on who controls merchant pricing, how the margin is shared, what fixed fees they pay, and how much operational work sits with their internal team.
As payment volume grows, those differences become even more consequential. The processor with the lowest advertised rate isn’t necessarily the one that leaves your platform with the strongest economics.
Payment processors with better economics at scale for SaaS include Fiska, Adyen, and Finix.
What does “better payment economics” actually mean?
Better economics aren’t synonymous with cheaper processing. For a SaaS platform monetizing payments, what ultimately matters is how much value remains after the entire payment model is accounted for. That includes:
- Underlying processing cost: Interchange, card-network fees, and processor markup
- Merchant pricing: What your merchants ultimately pay to accept payments
- Payment margin: The spread between your underlying cost and merchant pricing
- Revenue share: How much of that margin your platform actually retains
- Fixed and ancillary costs: Platform fees, minimums, tokenization, billing, implementation, or other charges
- Operational costs: Internal resources spent on onboarding, disputes, reconciliation, risk, compliance, and support
Why revenue share matters if you want real revenue from payments
Flat-rate pricing works well for a lot of SaaS platforms, and Fiska actually recommends it for many early-stage companies: it’s predictable, easy to explain to merchants, and keeps billing simple while you’re still figuring out your payments strategy.
But if payments are meant to be more than a convenience feature – if you actually want them contributing real revenue to your business – the model you’re on starts to matter a lot more.
Patrick Huynh, Fiska’s CEO, explains: Too many software companies end up acting as “bill collectors” for their payment provider instead of partners sharing in the revenue. Under a standard flat-rate or referral model, your platform does the work of driving merchant volume, but most of the upside stays with the processor.
A few signs it’s worth a closer look at revenue share:
- Your payment volume has grown significantly. Under a standard flat rate, that growth mostly benefits your provider, not you. A revenue-share model lets your margin expand alongside your processing volume instead of staying flat while volume climbs.
- Payments are becoming a real income stream, not just a feature. Once transaction processing starts meaningfully contributing to your profits and losses, the split you’re getting on that margin has a real impact on your bottom line. A provider that keeps the whole spread above interchange puts a ceiling on what you can earn.
- You need more control over merchant pricing. A one-size-fits-all rate rarely fits a varied merchant base. Custom pricing by segment lets you stay competitive without giving up margin.
- Your payment needs have gotten more complex. As you expand from simple online checkout into card-present, mobile, or cross-border transactions, a rigid setup can force you into stitching together multiple vendors, creating data silos and extra engineering work you didn’t sign up for.
What to look for in a payment processor as your SaaS scales
Before you start comparing providers, get clear on what actually matters to your business.
Economics that improve with your growth
Ask providers how your effective rate moves as volume doubles or triples. What’s the markup? What’s the revenue-share split? Are there platform fees or minimum volume commitments buried in there? The providers worth working with are the ones whose model gets better for you as you scale, not worse.
Control over merchant pricing and monetization
Who actually sets the rates your merchants pay: you or the processor? If a provider lets you build custom pricing tiers, offer volume discounts, or fold processing costs into your subscription plans, you’ve got a real lever for recurring revenue. Hand that control over, and you’re leaving money and flexibility on the table.
Infrastructure that doesn’t need to be rebuilt as you grow
Every new payment channel or provider switch tends to mean months of engineering work nobody budgeted for. The fix is picking infrastructure that handles online, mobile, and in-person payments through one API from the start. Add a new payment method or expand into a new country later, and your team isn’t stuck rebuilding backend workflows from scratch.
Read more: How to choose embedded payment solutions for SaaS
Commercial flexibility
Read the contract terms closely and look for exclusivity clauses, long-term lock-ins, and monthly minimums. These are easy to skim past and expensive to discover later. When you’re processing hundreds of millions of dollars, a restrictive agreement isn’t just annoying, it’s a real operational risk. If the terms are flexible, you’ll have freedom to change course as your business evolves.
A provider that supports your payments strategy
Scaling platforms need more than self-serve documentation and ticket queues when payment issues arise.
Look for a processor that helps with risk management, merchant onboarding, go-to-market strategy, and custom API work. This way, your teams can spend time perfecting your product instead of focusing on payments.
Payment processors to consider for better SaaS economics at scale
| Provider | Pricing structure | Platform fee | Payment channels |
|---|---|---|---|
| Fiska | Interchange pass-through plus custom markup with true revenue share | $0 | Omnichannel (web, mobile, in-person) |
| Adyen | Interchange++ plus per-transaction fee | $0 | Omnichannel |
| Finix | Flat rate, dynamic, or custom | Starts at $99 per month | Omnichannel |
Fiska: A payment model designed to share the upside
Fiska’s economic model is built around the margin generated above interchange. Rather than treating SaaS companies primarily as referral partners, Fiska shares that payment profit with your platform.
That changes the economics as your transaction volume grows: more merchant adoption can translate directly into more payment revenue for you instead of just more processing volume for the provider.
With Fiska, you can:
- Earn recurring revenue through a true revenue-share model that splits all profits above interchange and has no platform fees or monthly minimums.
- Set custom merchant pricing across different verticals and customer segments, with the flexibility to offer interchange-plus, flat-rate, or bundled SaaS pricing.
- Unify in-person, online, and mobile checkout flows using one API integration with universal tokenization.
- Receive dedicated support, including strategic guidance on pricing, risk management, and go-to-market execution.
Adyen: For large platforms with global payment needs
Adyen offers enterprise-grade payment infrastructure for large platforms processing high volumes across multiple international markets.
Adyen uses an interchange++ model with a $0.13 fixed processing fee (or local currency equivalent) plus card network assessments. The company doesn’t charge setup fees or monthly platform fees.
Adyen provides platform tools for merchant onboarding, global acquiring, unified risk management, and multi-currency payouts. The company’s global reach makes it a strong option for large international platforms, though smaller software companies may find the integration requirements and operational model overly complex.
Finix: For platforms seeking more control over embedded payments
Finix operates as both a processor and a payment facilitation platform, offering flexible pricing options and deep configuration control for software platforms.
You can choose between flat-rate pricing and dynamic interchange-plus models. For U.S. transactions, the flat rate is 2.75% plus $0.30, while dynamic pricing charges interchange plus network fees and a 0.30% plus $0.30 markup. Custom enterprise rates are also available for higher volume platforms.
Finix supports white-labeled merchant portals, tokenized omnichannel payments, and custom fee profiles. However, you should account for additional costs, such as monthly merchant account fees and token update charges, which can add up as your merchant base expands.
Choosing the right payment model as your software scales
Flat-rate processing gets you off the ground, but it caps your upside. The real margin lives in moving to interchange-based pricing as you scale, whether that’s through Adyen’s enterprise reach, Finix’s PayFac-as-a-Service control, or Fiska’s revenue-sharing model built for vertical SaaS.
FAQ
What’s the main drawback of flat-rate payment processing for scaling SaaS platforms?
Flat-rate processing hides the actual cost of card network fees inside a fixed rate, preventing software platforms from capturing the margin created as transaction volume grows.
How does interchange-plus pricing differ from flat-rate pricing?
Interchange-plus pricing separates the actual card network fee from the processor markup, giving platforms full visibility into baseline costs and unit economics.
When should a SaaS platform move away from a standard payment aggregator?
Platforms should evaluate alternatives when processing volume increases significantly, payments become a primary revenue target, or merchants require custom pricing and in-person checkout capabilities.
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