CHECKOUT.COM

Guillaume Pousaz grew up in Switzerland, studied briefly, then left to travel and surf. He ended up in Southeast Asia in the mid-2000s working at a payments company, and that's where he started to understand the plumbing underneath online commerce.

He saw that the payment rails most businesses relied on were slow, expensive, and riddled with middlemen — and that the companies building alternatives were mostly focused on the US and Western Europe.

In 2012, he founded Checkout.com — initially as a payments gateway aimed at merchants who needed to process transactions across multiple geographies without getting throttled by legacy bank networks. The early years were unglamorous.

He bootstrapped most of the operation himself, kept the team small, and focused obsessively on the technical infrastructure rather than growth marketing or PR. He reportedly funded much of the early company from his own pocket.

The company barely registered on the startup radar for years. No splashy seed rounds.

No TechCrunch profiles. Just quiet, grinding product work in the background while the fintech world buzzed about Stripe, Adyen, and Square.

That turned out to be the whole strategy.

Checkout.com is a payments infrastructure company. The basic deal: businesses that want to accept money online plug into Checkout.com instead of trying to navigate banks, card networks, and local payment methods themselves.

Checkout.com handles the complexity — card processing, fraud detection, currency conversion, local payment methods — and charges a fee per transaction for doing it.

The customers are mostly large and mid-sized enterprises: think e-commerce platforms, gig economy companies, travel businesses, fintechs. These aren't small merchants using Shopify — they're companies processing tens or hundreds of millions of dollars a month who care intensely about authorization rates (i.e.

what percentage of attempted payments actually go through) and fees at scale.

The edge Checkout.com sells is performance. They claim higher authorization rates and lower decline rates than legacy processors because they've built direct connections to card networks and issuing banks in key markets, cutting out the layers of intermediaries that slow things down and eat into margins.

For a business processing $500 million a year, even a 1% improvement in authorization rate is worth millions. That's the pitch — and it's a compelling one.

The core product is a payment processing platform — a set of APIs that let businesses accept payments globally without building the infrastructure themselves. It handles card payments, local payment methods (like iDEAL in the Netherlands or MADA in Saudi Arabia), and digital wallets in a single integration.

The selling point is that it is one API for the whole world, rather than stitching together five different processors for five different regions.

Intelligent Acceptance, launched in 2023, is the flagship layer on top: an AI optimization engine trained on billions of transactions that raises the share of attempted payments that actually go through. For a merchant processing hundreds of millions a year, a one-point gain in acceptance rate is worth millions, and this is the product that pitch is sold on.

There is also Fraud Detection Pro, which combines machine learning with customisable rules to flag suspicious transactions without over-blocking legitimate ones. False declines are a massive revenue problem for high-volume merchants, so a smarter filter that errs toward acceptance with the right controls is genuinely valuable.

They also offer Issuing — virtual and physical cards that companies can create and give to their own customers. This is the infrastructure that powers fintech products: if you are building an expense management tool or a neobank, Checkout.com can provide that backend.

It is a B2B product aimed at fintechs building financial products, which is a fast-growing and sticky market.

Checkout.com's growth strategy was essentially: stay invisible until you are indispensable. While competitors were raising mega-rounds and hiring PR firms, Pousaz was signing enterprise clients quietly and building direct card network relationships in markets other processors did not bother with — the Middle East, Southeast Asia, Eastern Europe.

The real inflection point came when it started landing massive platform clients. Grab, the Southeast Asian super-app, used it.

So did Deliveroo, Klarna and Pizza Hut's digital operations. Crypto exchanges were a large and volatile chunk of volume during the 2021 boom, and the relationships that came with that were not all durable — a payments dispute with Binance ended in litigation in 2023.

The other counterintuitive move was geographic. Checkout.com deliberately prioritized markets Stripe had largely ignored — the Middle East in particular, where Pousaz spent years personally building relationships with banks and regulators.

It became a dominant processor in the region, a wedge that was almost impossible to replicate quickly. Total payment volume passed $300 billion in 2025, and the company is now pitching itself at "agentic commerce" — payments initiated by AI shopping agents.

The valuation story is the uncomfortable part. In January 2022, Checkout.com raised at a $40 billion valuation — the peak of the fintech bubble.

Within months the market had turned, and the company marked itself down internally to $11 billion in December 2022 and $9.35 billion in 2023. In September 2025 it set a fresh $12 billion mark for an employee share buyback, nearly 30% above the low but still less than a third of the peak.

Pousaz has said there are no plans to go public, so the IPO rumoured for 2023-24 never came.

There is also the competitive pressure. Stripe is enormous, well-capitalized, and improving.

Adyen is public, profitable, and trusted by the biggest enterprises in the world. Checkout.com has to keep proving that its infrastructure advantage is durable — and that its geographic bets in the Middle East and emerging markets pay off long-term.

It has at least stopped burning: the company reported a return to full-year EBITDA profitability in 2025 with net revenue up more than 30%.

For most of its life, Checkout.com was essentially self-funded by Pousaz — which is unusual for a company that eventually hit a $40 billion valuation. The first major external raise didn't happen until 2019, when the company raised $230 million in a Series A at a $2 billion valuation from Insight Partners, along with Blossom Capital and others.

That was a significant moment: Series A funding at a $2 billion valuation meant they skipped the normal startup ladder almost entirely.

In 2021, the rounds got larger and faster. A $450 million Series B in January 2021 led by Coatue and Tiger Global pushed the valuation to $15 billion.

Tiger Global — at the time writing enormous checks into anything fintech-adjacent — was a strong validator for the institutional market. Then in January 2022, a $1 billion raise at $40 billion valuation came in from a group that included Dragoneer, Tiger Global, Insight Partners, and Coatue again.

The round made Checkout.com the most valuable private tech company in Europe at the time.

Pousaz himself retained enormous ownership through the process — reportedly owning somewhere above 40% of the company going into those late rounds — which means his net worth on paper hit extraordinary heights during the peak, and has since moved with the valuation uncertainty. The backing from growth-stage heavyweights like Tiger and Coatue gave the company credibility but also tied it to the frothy valuation expectations of 2021, which created the overhang the company is still managing.