Best Payment APIs for SaaS
Comparing payment processing solutions for SaaS applications — subscriptions, billing, and checkout.
Payments are the one integration where mistakes cost real money. The wrong payment processor means lost revenue from failed charges, tax compliance headaches, and hours spent on billing edge cases instead of building features.
For SaaS specifically, you need subscription management, dunning (failed payment recovery), tax handling, and ideally a customer portal. The question isn't just "which API is cleanest" but "which one handles the billing complexity so I don't have to."
Quick Comparison
| Tool | Best For | Pricing |
|---|---|---|
| Stripe TOP PICK | Most SaaS apps | 2.9% + 30c per transaction |
| Lemon Squeezy | Solo developers and small teams who want zero tax headaches | 5% + 50c per transaction |
| Paddle | Growing SaaS companies that want enterprise-grade MoR | 5% + 50c per transaction |
1. Stripe
The most comprehensive payment platform. Handles payments, subscriptions, invoicing, tax, and financial infrastructure.
Pros
- + Best payment API in the industry
- + Stripe Billing for subscription management
- + Stripe Tax for automated tax calculation
- + Massive ecosystem of integrations
- + Customer portal, invoicing, dunning built in
Cons
- - You're responsible for tax compliance in most cases
- - Complexity grows fast with advanced billing
- - Dashboard can be overwhelming
- - Disputes and chargebacks are painful
- - Account holds/freezes can happen without warning
Best for: Most SaaS apps. Best when you want maximum control over the payment experience and don't mind handling tax compliance.
Pricing: 2.9% + 30c per transaction
2. Lemon Squeezy
Merchant of Record platform that handles global payments, tax, and compliance for digital products and SaaS.
Pros
- + Merchant of Record — handles all tax compliance globally
- + Simple API for subscriptions and one-time payments
- + Built-in checkout that looks professional
- + No need for your own tax infrastructure
- + Good developer experience and documentation
Cons
- - Higher fees than Stripe (5% vs 2.9%)
- - Less control over the checkout experience
- - Smaller ecosystem and fewer integrations
- - Payout schedule slower than direct processing
- - Less mature for complex billing scenarios
Best for: Solo developers and small teams who want zero tax headaches. Best for digital products and simple SaaS subscriptions.
Pricing: 5% + 50c per transaction
3. Paddle
Merchant of Record payment platform for SaaS. Handles subscriptions, global tax, and compliance at scale.
Pros
- + Merchant of Record — full global tax compliance
- + Robust subscription and dunning management
- + Paddle Retain for reducing churn
- + More mature MoR platform than Lemon Squeezy
- + Better suited for larger SaaS companies
Cons
- - Higher fees than Stripe
- - Checkout experience is less customizable
- - API is functional but not as elegant as Stripe
- - Onboarding process can be slow
- - Less suited for physical products or marketplaces
Best for: Growing SaaS companies that want enterprise-grade MoR. Best when you're scaling internationally and need tax compliance handled.
Pricing: 5% + 50c per transaction
Verdict
For most SaaS apps, Stripe is still the default. The API is the gold standard, the ecosystem is massive, and Stripe Billing handles subscription complexity well.
Use Lemon Squeezy or Paddle if you want to skip sales tax compliance entirely — they act as Merchant of Record, handling global tax for you. This is huge for solo developers and small teams who don't want to deal with VAT.