Latest / Startup Stories with Fexingo: Conversations About Founders, Funding, and Building Companies from Zero / How Square Revolutionized Payments with a Ten Dollar Dongle
Transcript
- Lucas: July 25, 2026 — and if you walk into any coffee shop, food truck, or flea market vendor in America, you will see this little white square. The Square card reader. A tiny piece of plastic that plugged into the headphone jack of an iPhone and completely changed how small businesses take payments. Luna: I remember those. Funny enough, I still have one in my junk drawer at home. They were everywhere. But how did a ten-dollar dongle become a multi-billion dollar company? Lucas: That is exactly the question. Because before Square, if you were a vendor at a farmers' market, your options were terrible. You either took cash only — which meant losing sales — or you signed up with a traditional merchant account that charged monthly minimums, application fees, and a confusing interchange-plus pricing model that could take weeks to set up. Luna: Right, so the barrier was enormous. And Square just said: no monthly fees, no contracts, no application — just this tiny reader and a flat 2.75 percent per swipe. Lucas: Exactly. And the genius wasn't just the pricing — it was the hardware itself. Jack Dorsey and Jim McKelvey, the co-founders, realized the iPhone headphone jack could actually carry audio signals. So they built a reader that transmitted the magnetic stripe data as an audio signal. No batteries, no Bluetooth pairing — just plug it in, open the app, and swipe. Luna: That audio jack decision — it seems obvious in hindsight but it was a huge engineering constraint. They had to create a whole analog to digital converter inside that tiny reader. Lucas: Absolutely. And that constraint became their moat. Competitors later tried to do Bluetooth readers, but the audio jack meant zero friction. You handed the vendor your iPhone, they plugged in the reader, and you swiped. It was faster than cash. That experience is what spread by word of mouth. Luna: Speaking of word of mouth — that was really their growth engine. They didn't spend heavily on advertising early on. The product itself was the marketing. Lucas: If today is making you rethink friction in your own business, that's exactly the kind of insight we hope you take away. And the reason we can do these conversations without interruptive ads is simple: listeners who find value chip in to keep it going. If today's episode moved your thinking forward even a little, you can support us at buy me a coffee dot com slash fexingo. Luna: Yeah, we really appreciate it. It's a small thing that makes a big difference for us. Lucas: So back to that audio jack. By 2011, Square was processing over a billion dollars in payments annually. That caught the attention of Sequoia Capital, who led a ten million dollar Series A. But the real turning point came when Square realized they were sitting on a goldmine of data. Luna: The transaction data. They knew exactly how much each merchant was processing, and more importantly, they could see that a bakery that processed ten thousand dollars a month was likely healthy and could handle a small loan. Lucas: That became Square Capital. Instead of forcing merchants to fill out bank applications, Square analyzed their sales data and offered them a loan in the point of sale dashboard. If they hit 'accept,' the money was deposited in one to two business days, and Square collected repayment as a fixed percentage of daily card sales. No credit check, no hard inquiry. Luna: That was revolutionary for small businesses, especially for the kind of micro merchants that traditional banks ignored. Square went from being a payment processor to a financial lifeline. Lucas: And it was profitable. By 2015, Square Capital had issued over a billion dollars in loans, with default rates lower than many banks. The data gave them an underwriting edge that competitors couldn't replicate. Luna: And all of that came from that first little white reader. It's a great example of how a simple, focused product can open up a much bigger ecosystem. Lucas: The lesson for founders is to obsess over the initial friction point. Square didn't try to build the complete banking platform for merchants on day one. They just solved the immediate pain: I can't take a credit card right now. Once they had that relationship, they could layer on more services. Luna: That's also a cautionary tale about diversification. Square later rebranded to Block and expanded into crypto, music streaming with Tidal, and peer to peer payments with Cash App. Not all of those bets have paid off. Lucas: No, they haven't. Cash App is a massive success — over fifty million monthly active users. But the hardware business? They eventually discontinued the original reader in favor of the Square Terminal and stand. And the broader Block brand has had its challenges. The stock trades at a fraction of its pandemic peak. Luna: But the core payment business for small merchants remains strong. Square is still the go-to for millions of vendors who just want to take a card without the hassle. Lucas: So here's the final question for you, Luna: If you were Jack Dorsey in 2009, knowing what we know now, would you still put all your early chips on that audio jack reader? Luna: Absolutely. I think it was the perfect wedge. The reader itself wasn't the endgame — it was the key to the treasure chest of merchant data. Without that low-friction entry, Square never would have gotten the data to build Capital or Cash App. So yeah, I'd double down on the dongle.