Block (Square)

Klarna

Block (Square)

Block makes money across several business lines. Square (the seller ecosystem) charges merchants a flat percentage per transaction — 2.6% + $0.10 for in-person payments, higher for online.

Cash App takes a fee on instant deposits, Bitcoin trading, and Cash App Pay transactions. Afterpay (acquired for $29 billion in 2022) earns merchant fees on buy-now-pay-later transactions.

TIDAL is the music streaming service (acquired from Jay-Z). Block also earns Bitcoin revenue — Cash App is one of the largest Bitcoin brokers in the US, though margins on BTC trading are razor-thin.

Klarna

Klarna makes money from merchant fees and consumer interest. Merchants pay Klarna 3-6% of each transaction — they're willing to pay because Klarna increases conversion rates by 30%+ and average order values by 45%.

On "Pay in 4" (interest-free installments), Klarna makes money purely from merchant fees. On longer financing (6-36 months), Klarna charges consumers interest up to 25% APR.

Klarna also earns revenue from its shopping app (affiliate commissions when users discover and buy from merchants), and from its Klarna Card.

Block (Square)

The origin story starts with Jim McKelvey, a glass blower in St. Louis and old friend of Jack Dorsey.

In 2009, McKelvey lost a $2,000 sale on a glass faucet because he couldn't accept credit cards. The customer wanted to pay with Amex.

McKelvey couldn't process it. The sale fell through.

McKelvey called Dorsey, who was already CEO of Twitter, and they started brainstorming. The problem was obvious: millions of small businesses, street vendors, farmers market sellers, and independent contractors couldn't accept credit cards because merchant accounts required monthly fees, credit checks, and clunky hardware that cost hundreds of dollars.

Dorsey and McKelvey wanted to make it so anyone could accept a credit card using just their phone.

They built a tiny white card reader that plugged into a smartphone's headphone jack. The reader cost almost nothing to manufacture and Square gave it away for free.

The software was simple — swipe the card, enter the amount, the customer signs on the screen, done. Square charged a flat 2.75% per transaction with no monthly fees, no contracts, and no minimums.

The product launched in 2010 and spread through small businesses like wildfire.

Klarna

Sebastian Siemiatkowski, Niklas Adalberth, and Victor Jacobsson were students at the Stockholm School of Economics. In 2005, they entered a startup competition with an idea: let people buy things online and pay later.

At the time, online shopping was still new and most people were terrified of entering their credit card details on the internet. The idea was simple — Klarna would pay the merchant immediately, and the customer would get an invoice with 14-30 days to pay.

The competition judges hated it. The idea was dismissed as financially irresponsible and the team didn't win.

But Siemiatkowski pressed on. Swedish e-commerce was growing fast and merchants were desperate for any way to reduce cart abandonment.

Klarna's "pay after delivery" model was a hit because it shifted the risk — customers could receive the product, try it on, and only pay for what they kept.

The first customers were Swedish e-commerce merchants selling fashion and home goods. Klarna handled the invoicing, fraud detection, and collections.

Merchants saw conversion rates jump because customers were more willing to buy when they didn't have to pay immediately.

Block (Square)

Square grew by giving away the hardware. The card reader was free.

That eliminated the biggest barrier for small businesses. A food truck operator, a yoga instructor, a farmers market vendor — anyone could start accepting cards in five minutes without spending a dollar upfront.

Square made its money on the transaction fees that followed.

The simplicity was the pitch. Traditional merchant services involved contracts, monthly minimums, tiered pricing, and hidden fees that required a finance degree to understand.

Square charged one flat rate for everything. No surprises.

That transparency built enormous trust with small business owners who had been burned by traditional processors.

Cash App grew through peer-to-peer payments and a brilliant viral strategy. The app launched in 2013 as a simple way to send money to friends.

Rappers, influencers, and content creators started using their $cashtag for tips and payments. Cash App sponsored hip-hop events and partnered with musicians.

By 2024, Cash App had over 55 million monthly active users — more than most banks.

Klarna

Klarna grew by being embedded at checkout. The strategy was to sign up the biggest online retailers and become a payment option alongside Visa and PayPal.

Once Klarna was at checkout, consumers discovered it organically. The "Pay in 4" button became ubiquitous across fashion, electronics, and home goods retailers.

The Klarna app became a growth engine beyond checkout. By building a shopping app where users could browse products, discover deals, and track deliveries, Klarna turned from a payment method into a shopping destination.

The app has 35+ million monthly active users who start their shopping journey inside Klarna before even visiting a retailer.

International expansion was aggressive. Starting in Sweden, Klarna rolled out across Europe, then into the US, UK, and Australia.

The US became the biggest growth market — American consumers were especially receptive to Pay in 4 as an alternative to credit cards. By 2023, Klarna had 34 million US users.

Block (Square)

The Afterpay acquisition for $29 billion in 2022 was controversial. Buy-now-pay-later was already facing regulatory scrutiny and growing delinquency rates.

Critics argued Dorsey overpaid at the peak of the market. Afterpay's revenue growth slowed significantly after the acquisition, and write-offs on bad consumer debt increased.

It remains the biggest bet Block has ever made.

The Bitcoin obsession worries investors. After renaming Square to Block in December 2021, Dorsey went all-in on Bitcoin — investing company cash in BTC, building Bitcoin mining hardware, and creating TBD (a Bitcoin-focused developer platform).

While Cash App's Bitcoin revenue is huge on paper ($10+ billion annually), the margins are tiny. Investors question whether the Bitcoin focus distracts from the core payments business.

Competition is intense on every front. Square competes with Stripe, Toast, and Clover for merchants.

Cash App competes with Venmo, Zelle, and Apple Pay for consumers. Afterpay competes with Klarna, Affirm, and bank-native BNPL products.

Block has to fight multiple wars simultaneously with finite resources.

Klarna

The valuation collapse was humiliating. Klarna raised at a $46 billion valuation from SoftBank in 2021.

One year later, they raised a down round at $6.7 billion — an 85% haircut. It was the most dramatic valuation drop in fintech history.

Employee stock options were underwater. Siemiatkowski had to lay off 10% of the workforce.

The entire BNPL category went from hot to radioactive in months.

Credit losses are the existential risk. Klarna is lending money to consumers who want to buy things they can't afford to pay for right now.

When the economy slows, defaults rise. Klarna's credit losses hit $1 billion in 2022.

The company had to tighten underwriting significantly and pull back from riskier markets. The tension between growth (approve more loans) and profitability (reject risky borrowers) defines every quarter.

The IPO in 2025 was a comeback story but with caveats. Klarna went public at $15 billion — a major recovery from the $6.7 billion trough but still less than a third of its 2021 peak.

The company finally turned profitable by slashing costs with AI (replacing hundreds of customer service agents with AI chatbots) and tightening credit standards. But investors remain cautious about the BNPL model's long-term sustainability.

Block (Square)

Square is the merchant ecosystem — point-of-sale hardware, payment processing, invoicing, payroll, loans, and online stores for businesses of all sizes. Cash App is the consumer side — peer-to-peer payments, direct deposit, investing, Bitcoin buying, and the Cash App Card (a debit card).

Afterpay is the buy-now-pay-later product — split any purchase into four interest-free payments. Square Banking offers business checking accounts and loans.

Square Online lets merchants build e-commerce websites. TIDAL is the music streaming platform that pays artists higher royalties.

Klarna

Pay in 4 is the signature product — split any purchase into four interest-free payments over six weeks. Pay in 30 lets customers receive the product first and pay within 30 days.

Financing offers longer-term payment plans with interest for larger purchases. The Klarna App is a shopping destination — browse deals, track orders, manage payments, and earn cashback.

The Klarna Card is a physical Visa card that lets users Pay in 4 anywhere. Klarna Creator is a platform for influencers to earn commissions sharing products.

Klarna AI is their customer service chatbot that handles two-thirds of support queries.

Block (Square)

Khosla Ventures, Sequoia Capital, Kleiner Perkins, Visa, Goldman Sachs, GIC (Singapore)

Klarna

Sequoia Capital, SoftBank, Silver Lake, GIC, Atomico, Commonwealth Bank of Australia, Heartland