payout APIs

Adyen

Pieter van der Does and Arnout Schuijff had already built and sold one payments company when they sat down in 2006 to start again. The result was Adyen — the name literally means "start over" in Surinamese — and the premise was simple: instead of stitching together the same fragmented payment infrastructure everyone else was using, they would build the whole thing themselves from scratch. That decision, made in an Amsterdam office nearly two decades ago, is still the reason Adyen is different. Most payment companies are assemblers — they buy a gateway here, a processor there, bolt them together and hope for the best. Adyen owns its own technology stack end to end, which means a merchant integrating once gets access to card processing, local payment methods, point-of-sale terminals, and real-time settlement data through a single platform. No middle layers, no reconciliation headaches, no finger-pointing between vendors when something breaks. The client list tells you everything about where Adyen sits in the market. McDonald's, Spotify, Microsoft, LVMH, H&M — these are companies with serious payment volumes and zero appetite for systems that don't work. Adyen became the default choice for enterprises that had outgrown the limitations of traditional payment stacks and needed something that could handle global scale without buckling. Since going public on Euronext Amsterdam in 2018, Adyen has grown into one of Europe's most valuable technology companies, with around 4,300 employees across 23 countries and net revenue of just under €2 billion in 2024. It remains headquartered in Amsterdam and consistently profitable — a combination that's rarer in fintech than it should be. For businesses that treat payments as infrastructure rather than an afterthought, Adyen is the benchmark everything else gets measured against.

Founded 2006

Mollie

Adriaan Mol built Mollie's first backend while living with his parents in the Netherlands in 2004. No investors, no office, no team — just a founder and an idea that small businesses deserved a payment integration that didn't require a team of lawyers and a six-month setup process. He bootstrapped it for over fifteen years before taking outside funding in 2019. By then, Mollie had already grown into one of the most important payment platforms in European e-commerce, entirely on the back of a product that developers actually liked using. The proposition is straightforward: one API, one dashboard, and access to the payment methods that actually matter across Europe. That means iDEAL in the Netherlands, Bancontact in Belgium, Klarna and SEPA Direct Debit everywhere, alongside cards, Apple Pay, and a growing list of local methods that would otherwise require separate integrations and separate acquirer relationships. Mollie handles the compliance, the fraud monitoring, and the settlement complexity. Merchants get a clean interface and a single invoice. For the 250,000 businesses using Mollie today — ranging from Gymshark and Wild to local bakeries and market stalls, as CEO Koen Köppen regularly points out — the appeal is less about feature lists and more about what they don't have to think about. European payments are fragmented by design. Every country has its preferred methods, its own regulatory quirks, its own consumer habits. Mollie's job is to make that invisible. The numbers from 2024 reflect a company that has found its model. Revenue reached €214 million, up 28% year on year, with gross profit growing 30% to €115 million and the company returning to positive EBITDA for the first time since 2018. Mollie raised a total of $940 million in funding and was valued at $6.5 billion following its 2021 Series C led by Blackstone. The most significant recent development is the acquisition of GoCardless in December 2025 — bringing the UK-based direct debit specialist into the Mollie group and substantially expanding its recurring payments and bank transfer capabilities across Europe. Combined, the two companies cover a considerable share of European e-commerce payment infrastructure. Mollie is still headquartered in Amsterdam, with around 900 employees across offices in Ghent, London, Lisbon, Munich, Milan, Paris, and beyond.

Founded 2004

Nexi

Nexi is Italy's largest payment services operator, controlling the infrastructure that moves money across the country's retail and corporate sectors. Founded in 2013 through a merger of two major Italian payment processors, it manages card transactions, merchant acquiring, and digital payment rails for banks, retailers, and businesses across Europe. The company operates across the full payments stack—from traditional POS terminals and card networks to modern API-based solutions and instant payment systems. Unlike most fintech startups, Nexi doesn't target consumers directly. Instead, it powers the payment backbone for Italian and European financial institutions and retailers, processing tens of billions in transactions annually. Its business model sits at the intersection of traditional payment infrastructure and modern open banking, positioning it as a critical node in Europe's shift toward real-time payments and embedded finance. Nexi's role is unglamorous but essential: it's the plumbing that makes modern commerce work, handling everything from contactless cards to mobile wallets to cross-border transfers. In the broader European fintech landscape, it represents the "boring" but profitable core—the infrastructure layer that fintechs themselves depend on to function.

Founded 2013

Swan

Swan is reshaping how European businesses handle payments by offering a modern, developer-friendly infrastructure layer that sits between companies and the complexity of traditional banking rails. Rather than forcing startups and established firms to navigate fragmented payment ecosystems, Swan bundles together payment processing, banking APIs, and compliance tooling into a single, coherent platform. The company targets mid-market and enterprise customers—think e-commerce platforms, SaaS businesses, and financial services—who need to embed payments into their core operations without hiring a dedicated payments team. Swan's core strength lies in its ability to strip away legacy banking friction: it handles card processing, instant payments, payouts, and cross-border transfers through a unified API, while managing the regulatory headaches that usually consume engineering bandwidth. In a European landscape crowded with payment gateways and banking APIs, Swan distinguishes itself through developer experience and architectural clarity. Where competitors often bolt together disparate services, Swan presents a genuinely integrated stack—one codebase, one dashboard, one billing model. The company serves as both a payments operator and a bridge to traditional banking, making it particularly valuable for businesses scaling beyond their first million transactions. Swan represents a broader maturation in European fintech infrastructure: the shift from "we'll process your payments" to "we'll become your payments backbone," enabling a generation of companies to focus on their core product rather than payment plumbing.

Founded 2019

Wero

Wero is a pan-European digital wallet built on the back of instant payments infrastructure, letting you send money across borders as easily as you'd split a coffee with a friend. The service is backed by major European banks and payment networks, so it carries the weight of established financial institutions without the friction they're usually known for. It positions itself as a genuinely European alternative to the US-dominated payment apps—no geopolitical complications, just European banking rails doing what they should have been doing all along. The app focuses on person-to-person transfers, merchant payments, and basic wallet functionality, all tied to your existing bank account rather than a proprietary balance. What sets Wero apart is its foundation in real-time payments infrastructure and bank partnerships, giving it legitimacy and reach that pure fintech startups struggle to achieve. It's not trying to be a challenger bank or investment platform—it's building something narrower but potentially deeper: a payment layer that feels native to Europe rather than imported from Silicon Valley. As European instant payment networks mature and regulations push toward open banking, Wero represents the infrastructure play that could become quietly essential.

Founded 2021

Mangopay

Mangopay sits at the intersection of payments infrastructure and marketplace complexity. Rather than selling fintech features individually, the company tackles the full stack problem: how do you actually move money between dozens of parties—buyers, sellers, platforms, creators—when everyone needs different settlement rules and nobody trusts a stranger with their cash. Founded in 2011, Mangopay is a Brussels-based powerhouse that specializes in payout infrastructure for marketplaces, platforms, and creator economies. The platform handles the messy reality of modern commerce: a freelancer in Barcelona getting paid by a client in London, a marketplace taking commission, a payment processor taking a fee, and a tax authority wanting its cut—all simultaneously, all reconciled, all compliant. What sets Mangopay apart is its pragmatism. While most payment processors treat multi-party transactions as an edge case, Mangopay designed around it from the start. The company's white-label approach means you barely know it's there—you integrate their APIs, they handle the regulatory nightmare, and your users see your brand. That's the opposite of fintech theater. The European fintech world has fractured into specialists: payments here, compliance there, ledger systems somewhere else. Mangopay refuses that fragmentation. In a landscape where payment orchestration feels trendy and new, Mangopay has been solving it at scale for over a decade.

Founded 2011

Rapyd

Rapyd is a global fintech infrastructure company that lets businesses accept payments and move money across 170+ countries without needing local banking relationships. Rather than forcing companies to navigate fragmented payment ecosystems country by country, Rapyd abstracts away the complexity—providing a single API that connects to local payment methods, wallets, and bank accounts everywhere from Southeast Asia to Latin America. The platform handles the unglamorous but essential work: acquiring local licenses, managing compliance, and integrating with hyperlocal payment rails so a startup in Berlin can charge a customer in Lagos as easily as one in London. For merchants and platforms operating globally, this means ditching the spreadsheet of payment processors and compliance frameworks. Instead of cobbling together 15 different providers to cover emerging markets, they get one dashboard, one contract, one API. Rapyd has positioned itself as the plumbing for the next wave of global commerce—the infrastructure layer that makes it possible for any business to think globally from day one, not after they've scaled. In a fintech landscape dominated by Western-centric payment networks, Rapyd's bet on true geographic diversity and local payment methods feels like a deliberate counterweight, making it an essential piece of the infrastructure for companies serious about serving the rest of the world.

Founded 2018

TransferMate

Building a global payments network from Ireland sounds geographically ambitious until you understand that what TransferMate built is the network rather than the consumer-facing product. Founded in Kilkenny in 2010, the company has spent over a decade assembling banking licences and direct connections to local payment systems across more than 200 countries — infrastructure that allows it to settle international payments domestically in each market rather than routing through correspondent banking. The technical achievement is substantial: TransferMate holds payment institution licences across multiple jurisdictions and has direct integrations with national clearing systems that most international payment companies access only through intermediaries. That infrastructure powers the international payment capabilities of major banks, fintechs, and platform companies including Allied Irish Banks, Wells Fargo, and ING. TransferMate operates primarily as a B2B infrastructure provider — the engine behind cross-border payment products that other companies offer to their customers. In the global payments infrastructure landscape, the companies that have built genuine local network access — rather than just routing through SWIFT and correspondent banks — represent a structurally different category of provider. TransferMate's two decades of regulatory and infrastructure investment make it one of the most credible examples of that model.

Founded 2010

PayGreen

PayGreen is a French payment orchestration platform built for the mobile-first era. Rather than forcing merchants through legacy payment infrastructure, PayGreen sits between the checkout and the bank, intelligently routing transactions across multiple payment methods and acquiring partners to optimize conversion and cost. The platform handles card payments, local payment methods, subscriptions, and marketplace payouts—all from a single integration point. What sets PayGreen apart is its emphasis on merchant control and transparency. Instead of hiding behind proprietary algorithms, it lets businesses see exactly how their transactions are being processed, what they're paying, and which methods work best for their customers. This matters particularly in markets like France and Southern Europe where payment preferences fragment wildly—a customer in Lyon might prefer a completely different checkout flow than one in Paris. The company positions itself as the anti-Stripe for merchants who've outgrown the one-size-fits-all model but don't want to hire a payments engineering team. It's equally comfortable powering a high-volume e-commerce operation as it is managing recurring billing for SaaS platforms or handling marketplace settlements. PayGreen operates across Europe but maintains particularly strong roots in France and the French-speaking fintech ecosystem. In the broader landscape, PayGreen represents a shift toward more granular, configurable payment infrastructure—the idea that payment orchestration isn't a feature you bolt on, but a core business decision that deserves transparency and control.

Founded 2014

Skrill

Skrill is a digital wallet and payments platform that lets you send money across borders, pay online, and manage multiple currencies without the usual banking friction. Founded in the mid-2000s as an early player in the fintech space, it's built a loyal following among freelancers, gamers, and anyone who moves money internationally and wants to skip the traditional bank queues. The platform handles card payments, e-wallet transfers, and cross-border remittances with a mobile-first approach that feels genuinely modern compared to legacy competitors. Skrill operates in a crowded market alongside Wise, PayPal, and newer entrants, but has carved out particular strength in emerging markets and gaming communities where its speed and accessibility matter most. It's part of Paysafe, a larger payments infrastructure group, which gives it backing while maintaining its distinct brand identity. For European users especially, Skrill represents the kind of alternative financial service that emerged when traditional banks couldn't move fast enough—a bridge between casual online spending and serious international money movement.

Founded 2001

Paddle

Selling software globally sounds straightforward until you encounter the reality of VAT compliance across 50 jurisdictions, the complexity of handling subscriptions across multiple payment methods, and the operational overhead of managing refunds, chargebacks, and payment failures at scale. Paddle was founded in London in 2012 as a merchant of record for software companies — taking on the legal and tax liability of selling software globally so that the software company doesn't have to. Rather than acting as a payment processor, Paddle actually buys the software from the vendor and resells it to the customer, making it responsible for tax collection, compliance, and financial reporting in every market where the sale occurs. That model — unusual in the payments landscape — removes an enormous operational burden from software companies that want to sell globally without building a compliance team. Paddle has grown into one of the most significant infrastructure providers for the European and global software industry, serving thousands of software companies from indie developers to enterprise SaaS businesses. Its acquisition of ProfitWell in 2022 added subscription analytics and revenue optimisation tools to the platform, turning it from a payment infrastructure provider into a broader revenue management platform for software companies.

Founded 2012

Small World FS

Remittances are one of the most economically important payment categories in the world — hundreds of billions of pounds flow annually from migrants in wealthy countries to family members in their countries of origin. The market has historically been dominated by Western Union and MoneyGram, both of which extract significant fees from the people least able to afford them. Small World Financial Services was founded in London in 2005 to compete in that market with a model focused on competitive pricing and trusted local distribution in the receiving countries. Its network covers over 90 countries with a combination of bank deposits, mobile wallet delivery, and physical cash pickup options that match how recipients actually want to receive funds — particularly important in markets where bank account penetration is low but mobile wallets are universal. Small World has built a particular following among the African and Latin American diaspora communities in Europe, segments that traditional banks serve poorly and that need the trust of a specialised remittance provider. In the European remittance market, where Wise and Remitly compete aggressively, Small World's depth in specific corridors and its dual physical and digital distribution remain genuine differentiators for the customer segments where physical pickup remains essential.

Founded 2005