Adyen Fee Calculator

The arithmetic

Adyen prices on interchange plus plus: interchange at cost, scheme fees at cost, and a fixed processing fee per transaction plus a payment method markup. Cost = interchange + scheme fees + $0.12 + method markup.

The fixed processing fee per transaction is the distinguishing feature. It makes Adyen inexpensive at higher order values and comparatively costly on small ones.

How that looks in practice

A $58 transaction with interchange at 1.80% + $0.10 ($1.14), scheme fees at 0.13% ($0.08), the fixed processing fee ($0.12) and a card markup of around 0.60% ($0.35): total $1.69, an effective 2.91%.

Against a flat 2.9% + $0.30, $1.98, Adyen saves $0.29 on this order.

On a $340 order the gap widens sharply: Adyen costs roughly $8.35 against $10.16 flat rate. On a $12 order it narrows to almost nothing, because the interchange fixed component and the processing fee dominate.

Where this breaks down

Adyen has historically applied a monthly minimum invoice, which makes it unsuitable below a certain volume regardless of how good the per-transaction economics look.

The pricing also requires understanding interchange to evaluate, because the largest component varies by card. A business cannot know its Adyen cost without knowing its card mix.

What this changes

Estimate the cost from your actual card mix rather than a single assumed interchange rate. The debit-to-premium-credit split moves the answer by more than the markup does.

Then check the monthly minimum against your volume. Interchange plus plus pricing is only worth having if you process enough for the transparency to save more than the minimum costs.

Why enterprise processors price this way

Interchange plus plus exposes every component, which suits a merchant large enough to have someone who reads the detail and small enough differences to matter at their volume. It also aligns incentives: the processor's revenue is the markup, not the spread.

Flat rate exists because most merchants do not want that detail and will pay a premium for one predictable number. Neither model is dishonest; they serve different buyers.

The transition point is usually where a business hires or contracts someone whose job includes payment costs. Below that, the time cost of managing interchange plus plus exceeds the saving; above it, the saving is real and compounds with volume.

Interchange plus plus produces a settlement report with far more detail than a flat-rate one, and that detail is only useful if something consumes it. A business that files the report without reading it is paying for transparency it never uses.

The specific thing worth reading is the interchange category breakdown, which shows how many transactions downgraded to a more expensive category and why. Those downgrades are frequently fixable: missing address data, delayed capture, incomplete commercial card fields, and each fix is a permanent reduction rather than a one-off saving.

That feedback loop is the real argument for the pricing model, and it is what a flat rate structurally cannot give you: under a bundled rate, a downgraded transaction costs the processor money and costs you nothing visible, so nobody ever fixes it.