Mollie, Adyen, Stripe: what embedded payments actually means in European mid-market

The three companies that built the category

European payments processing is dominated, for SaaS and e-commerce mid-market accounts, by three companies that took genuinely different paths to the same neighbourhood. Adyen, the Amsterdam-headquartered processor founded in 2006, built around a global enterprise-grade pipeline that competes for the largest accounts. Stripe, San Francisco by way of Limerick, expanded into Europe through developer-led adoption and SMB self-serve. Mollie, also Dutch and founded in 2004, took the longest and quietest path of the three, building a payments stack for European SMB and mid-market e-commerce that was deliberately easier to wire up than Adyen and locally more compliant than Stripe.

The economics of the European payments market favoured a small number of large players consolidating share, which is what happened. Adyen's 2018 IPO valued the company at €7.1 billion. Stripe's 2023 round valued it at $50 billion. Mollie's 2021 round at $6.5 billion was the structural confirmation that the European-built SMB-and-mid-market positioning was a defensible business in its own right rather than a temporary gap before the global players moved in.

What changed in the conversation from 2023 onwards is that the per-transaction rate, the historical battleground of payment processing, stopped being the most consequential decision for European mid-market buyers. The rates converged inside a narrow band. The real differentiation moved to the layer above: how the processor routes a transaction across networks, how it handles 3D Secure friction, how it reduces declined-payment rates, and how transparent its AI-driven decisions are to the merchant.

What the AI routing layer actually does

A European e-commerce business processing €30M in card payments annually loses roughly two to four percent of attempted transactions to false declines, which is the technical term for legitimate purchases that the issuer's fraud system declined incorrectly. Half a percent of revenue across two to four percent of attempted transactions sits in the false-decline cost. A processor that can reduce false declines by twenty percent through smarter routing is delivering a measurable revenue lift that often exceeds the savings from a marginally lower per-transaction rate.

Adyen's RevenueProtect product, which the company has been iterating since 2019, was the first European-built implementation of this idea at scale. The product looks at the transaction in real time, predicts whether the issuer will decline, and where applicable routes through a network or method that the model believes will produce a higher acceptance rate. The 2024 release of Adyen Uplift extended this to recovering declined payments through targeted retry logic and authentication choices that the merchant did not have to configure.

Stripe's equivalent, branded Stripe Radar for fraud and incorporated into the broader Optimized Checkout Suite for routing, made the same architectural bet with a different commercial framing. Stripe's product is more accessible to smaller merchants because it does not require the integration depth Adyen does. The trade-off is less customisation in the rules layer for merchants who want to override the model's defaults.