Adyen is an enterprise payments platform covering online, in-app and in-person payments across one integration, with global card schemes and 100+ local payment methods. Unlike flat-rate processors, it bills on interchange++ — transparent but more complex. Here's what it actually costs, who it suits, and how to get test credentials.
| Component | Cost | Notes |
|---|---|---|
| Processing fee | ~€0.11 / txn | Adyen's fixed markup per transaction |
| + Interchange | pass-through | Set by card networks; varies by card/region |
| + Scheme fees | pass-through | Visa/Mastercard network fees |
| Monthly fee | $0 | No monthly minimum, but volume expected |
Adyen targets mid-market and enterprise merchants doing real volume — marketplaces, large e-commerce, omnichannel retail. Interchange++ is genuinely cheaper than flat-rate (e.g. 2.9% + 30¢) at scale, because you only pay Adyen's small fixed markup over the true network cost. For a small startup with low volume, a flat-rate processor is usually simpler and the price difference is negligible. The crossover point is roughly when monthly processing runs into the tens of thousands.
1. Sign up for a test account at adyen.com.
2. In the Customer Area, go to Developers → API credentials and create a credential.
3. Generate an API key and note your merchant account name.
4. Use the test environment with Adyen's test cards, then apply for live access once verified.
A minimal payment session request:
If you're below enterprise volume, flat-rate processors are simpler to start with — compare Stripe and PayPal, or usage-friendly Square for in-person plus online. For digital products and SaaS with tax handled for you, see Paddle and Lemon Squeezy (merchant-of-record). Model the all-in cost of any of them with the payment fee calculator. Choose Adyen when you have high volume, international cards and an omnichannel setup where interchange++ transparency pays off.
Interchange++: a fixed ~€0.11 processing fee per transaction plus pass-through interchange and scheme fees set by the card networks. No monthly fee, but Adyen expects meaningful volume. Effective rate depends on your card mix.
Create a test account, then in the Customer Area generate an API credential and API key under Developers → API credentials. Test with Adyen's test cards before applying for a live account.
At high volume Adyen's interchange++ usually beats Stripe's flat 2.9% + 30¢ because you pay only a small fixed markup over true network cost. At low volume Stripe is simpler and the difference is small. Crossover is typically in the tens of thousands per month.
There's no monthly fee and a full test environment is free, but Adyen charges per transaction once live and is built for businesses with real processing volume, not hobby projects.
Not affiliated with Adyen. Prices are reference estimates — always verify on the official pricing page.