Stripe, Adyen, and PayPal Braintree were built around three completely different philosophies — Stripe for developers who want to build everything themselves, Adyen for large enterprises chasing the lowest possible cost at scale, and Braintree for businesses that need native PayPal acceptance — and after going through 2026 pricing, processing volumes, and the new agentic commerce features both Stripe and Adyen just shipped, the honest answer to "which one should I use" still comes down almost entirely to your transaction volume and what your customers expect at checkout.
This isn't really a three-way popularity contest. It's three different bets on where the payments market is heading, and each one has been right for a different kind of business.
I pulled together current fee structures, processing volumes, and feature comparisons because payment processor pricing changes often and quietly, and a guide based on last year's numbers can lead you toward the wrong decision for a meaningful amount of money.
Quick Comparison Table
| Feature | Stripe | Adyen | PayPal Braintree |
|---|---|---|---|
| Pricing Model | Flat rate: 2.9% + $0.30 per transaction | Interchange++ (transparent, scales with volume) | Comparable to Stripe at standard rates; volume-based at scale |
| 2025 Volume Processed | $1.9 trillion | €1.4 trillion (~$1.5T) | Part of PayPal's broader 430M+ account ecosystem |
| Best For | Startups, SaaS, marketplaces, developer-led teams | Large enterprises, omnichannel (online + in-store) retail | Businesses where native PayPal/Venmo checkout drives conversion |
| Setup Complexity | Fastest — live in an afternoon | Steeper learning curve, quote-based onboarding | Familiar to Stripe users; PayPal-specific features add complexity |
| 2026 AI/Agentic Commerce | Agentic Commerce Suite + Agentic Commerce Protocol (with OpenAI) | Adyen Agentic: Agentic Feed, Cart, and Payments APIs | No dedicated agentic commerce suite announced |
| Notable Customers | Best Buy, Coach, Kate Spade (Agentic Suite) | Uber, Spotify, eBay, Booking.com, Microsoft | Mobile-first apps needing native PayPal/Venmo/Apple Pay/Google Pay |
Stripe: Still the Developer Default, Now Racing Into AI Commerce
Stripe's core appeal hasn't changed in years: the API is clean, documentation is excellent, and a competent developer can go from zero to accepting payments in an afternoon. That ease of use has translated into real scale — Stripe processed $1.9 trillion in 2025 and was valued at $159 billion in early 2026, and its flat-rate pricing of 2.9% plus 30 cents per transaction remains the easiest pricing model in the industry to actually understand without a sales call.
What's new in 2026 is Stripe's aggressive push into AI-driven commerce. The company announced 288 product launches at its 2026 Sessions event, headlined by its Agentic Commerce Suite — already in use by Best Buy, Coach, and Kate Spade — alongside agent-ready financial accounts and the Agentic Commerce Protocol, co-developed with OpenAI specifically to power Instant Checkout inside ChatGPT. That's a meaningful bet that a growing share of purchases will start inside an AI conversation rather than a traditional storefront, and Stripe is positioning itself as the default rail underneath that shift.
The honest tradeoff is cost at scale. Stripe's flat rate is genuinely competitive for startups and mid-size businesses, but it becomes noticeably less so once volume climbs — one detailed comparison calculated that a business processing $100,000 a month pays roughly $3,200-plus in Stripe fees, a gap that interchange-plus pricing from Adyen or other high-volume processors can meaningfully undercut. Stripe also doesn't natively process PayPal payments, a real gap for any business where PayPal acceptance noticeably affects checkout conversion.
Adyen: Built for Enterprises Who Need One Platform Everywhere
Adyen's pitch is fundamentally different from Stripe's: instead of a flexible API you build around, it's a single unified platform meant to handle online, mobile, and in-person payments through one contract, with direct connections to global and local card networks that improve authorization rates and lower costs at genuine scale. The client list reflects that positioning — Uber, Spotify, eBay (which moved away from PayPal in 2021), Booking.com, Microsoft, and Etsy all process through Adyen, and the company handled €1.4 trillion in 2025 at €2.4 billion in net revenue.
The pricing model is the real differentiator. Adyen uses interchange-plus pricing rather than a flat rate, meaning there's no fixed monthly fee — you pay per transaction with costs scaling more favorably as volume grows, which is precisely why large, omnichannel, or international enterprises tend to land on Adyen over Stripe once they outgrow flat-rate economics. Adyen also processes PayPal directly, charging a simple 12-to-13-cent markup on top of standard PayPal rates, along with support for Samsung Pay and Maestro, two payment methods Stripe doesn't handle natively.
Adyen matched Stripe's AI commerce push in 2026 with Adyen Agentic, a modular API suite covering Agentic Feed, Agentic Cart, and Agentic Payments specifically built for selling through conversational AI interfaces, alongside new all-in-one S1E4 Pro and S1F4 Pro terminals for retail and food service. The honest limitation: Adyen genuinely isn't built for smaller businesses — pricing is quote-based rather than published, implementation requires meaningful engineering resources, and the support model is tiered in a way that favors large accounts over solo founders just getting started.
PayPal Braintree: The Practical Choice When PayPal Acceptance Actually Matters
Braintree occupies a specific, well-defined niche: it's PayPal's developer-facing payment platform, built after PayPal's 2013 acquisition of Braintree specifically to compete with Stripe on API quality while keeping native PayPal integration as its core differentiator. For developers who already know Stripe, Braintree feels genuinely familiar — clean API, thorough documentation, and broad SDK coverage across web, iOS, Android, and React Native.
The single biggest reason businesses choose Braintree over Stripe is the checkout experience it enables. Braintree natively accepts PayPal, Venmo (in the US), and PayPal Pay Later alongside all major credit and debit cards, Google Pay, and Apple Pay — resolving what's often described as the single largest gap in Stripe's payment method coverage. For ecommerce businesses where a meaningful share of customers specifically look for the PayPal button at checkout, that's not a minor convenience; it's a documented conversion lever, particularly for mobile-first apps and SaaS platforms that prioritize broad payment method flexibility over deep customization.
The tradeoff is that Braintree hasn't kept pace with Stripe and Adyen on the AI commerce front — as of mid-2026, neither a dedicated agentic commerce suite nor an equivalent to Stripe's Agentic Commerce Protocol has been announced for Braintree, leaving it positioned as the steady, conversion-focused choice rather than the platform racing hardest toward AI-native checkout flows.
So Which Payment Processor Should You Actually Choose?
- Building a SaaS, marketplace, or early-stage startup that values fast setup and predictable pricing? Stripe remains the right default — its developer experience and documentation are still the benchmark the other two get measured against, and its agentic commerce push is worth watching if AI-driven shopping matters to your roadmap.
- Processing high volume across multiple countries or channels, including in-person retail? Adyen's interchange-plus pricing and unified online/offline platform genuinely save money at scale, even though the onboarding process and minimum-business-size expectations are real barriers for smaller operations.
- Selling to consumers who specifically expect PayPal or Venmo at checkout? Braintree resolves Stripe's biggest gap directly, and its developer experience is close enough to Stripe's that the switching cost for technical teams is genuinely manageable.
A combination strategy is also worth considering rather than treating this as a single, permanent choice — using Stripe as a primary gateway with PayPal or Braintree available as an alternative payment method at checkout is a common, legitimate approach for businesses that want both Stripe's developer experience and PayPal's conversion benefits without picking just one.
Frequently Asked Questions
Is Adyen actually cheaper than Stripe?
It depends on volume — Stripe's flat 2.9% plus 30 cents is competitive for startups and lower-volume businesses, but Adyen's interchange-plus pricing typically becomes more cost-effective once a business is processing significant monthly volume, since costs scale more favorably than a flat percentage rate.
Does Stripe support PayPal payments?
No, Stripe does not natively process PayPal payments, which is one of the most commonly cited reasons businesses choose Adyen (which processes PayPal with a small markup) or Braintree (which natively supports PayPal and Venmo) instead of or alongside Stripe.
What is agentic commerce and why are Stripe and Adyen building for it?
Agentic commerce refers to purchases initiated or completed through AI agents and conversational interfaces rather than traditional web checkout flows — Stripe built its Agentic Commerce Protocol with OpenAI to power purchases inside ChatGPT, while Adyen launched a comparable Agentic API suite, both betting that AI-driven shopping will become a meaningful share of online commerce.
Is Braintree the same company as PayPal?
Braintree is owned by PayPal, having been acquired in 2013, and operates as PayPal's developer-focused payments platform, offering more customization and API flexibility than standard PayPal checkout while still natively supporting PayPal and Venmo as payment methods.
Which payment processor is best for a small business just starting out?
Stripe is generally the recommended starting point for small or early-stage businesses, given its fast setup, transparent flat-rate pricing, and extensive documentation, while Adyen is typically not a practical fit for smaller operations due to its quote-based pricing and higher implementation requirements.