How Jim McKelvey co-founded Square after losing a $2,000 sale

Executive overview

Small businesses couldn't accept credit cards because the payment industry required $100,000+ in annual transactions just to qualify. Jim McKelvey lost a $2,000 glass art sale because he couldn't accept Amex — and saw the iPhone as a device that should become anything, including a card reader.

He and Jack Dorsey built Square: a hardware reader through the headphone jack, a stripped-back fee structure, and a direct path into the card networks. The result was a product that onboarded millions of merchants the system had never served.

The credit card industry's barriers were structural, not technical — Square's edge was solving 14 interconnected problems simultaneously, not just building a reader.

Early career: glassblowing, publishing, and pattern recognition

• Published a programming handbook as a freshman at WashU out of frustration with a bad textbook — it sold and got him a real publisher.
• Realised he could operate effectively by surrounding himself with people better than him and making them more productive.
• Funded early ventures from glassblowing income — studio output was $1,000 per day in product value.
• Ran three simultaneous businesses (glassblowing, IBM remote work, CD storage cabinets) before age 24; described them all as mediocre.
• His mother's suicide at 24 became a defining force: the regret of inaction turned into a permanent bias toward doing something rather than waiting.

Mira and meeting Jack Dorsey

• Started Mira, a document imaging company similar to early Adobe Acrobat; Adobe launched Acrobat and wiped out the product.
• Pivoted to producing CD-ROMs for trade shows — charged competitors $10/page to put their literature on a disc distributed to all attendees; made $70,000 profit on the first disc despite the trade association suing to stop him.
• Hired a 15-year-old Jack Dorsey from a coffee shop to scan documents overnight; kept giving him harder projects, each delivered better than expected.
• Foresaw the internet killing the CD-ROM business in 1995; Dorsey was the only one who acted on the pivot to academic conference publishing.
• Mira still operates today as a web publishing business for conference papers.

The origin of Square

• In 2009, McKelvey was packing up his St. Louis studio to move to San Francisco when a buyer in Panama tried to purchase a $2,000 glass faucet — he couldn't accept her Amex card.
• Looking at his iPhone, he concluded it should be able to become a credit card reader.
• Jack Dorsey's response: "That's interesting." They hired Tristan Attyrney, a lead iPhone engineer, before they had a clear product idea.
• The payment system required "card present" transactions to protect merchants from chargebacks; this meant reading the magnetic stripe, not the camera.
• Used a headphone-jack read-head (inspired by a Make Magazine hack) to avoid needing Apple's dock connector permission — Apple still could have blocked the App Store, but a near-meeting with Steve Jobs kept their lawyers at bay.
• First aluminium prototype conducted Jack Dorsey's heartbeat through the casing, disrupting reads; never used aluminium again.
• Reader cost: 97 cents, manufactured in China after McKelvey negotiated fractions of a cent.

Navigating the credit card system

• The payment chain: card networks (Visa, MasterCard) write rules and take basis points; independent sales organisations and sponsor banks stack fees on top — small merchants paid 5–6% or more.
• Merchants needed $100,000+ annual volume, a sponsoring bank, physical location, and accounting infrastructure just to qualify.
• Card networks had no incentive to block Square: Square would pay rack rates and bring in millions of new merchants they couldn't exploit yet.
• McKelvey counted 17 laws and regulations Square was breaking at launch — banking rules, network rules, KYC, state money transmitter laws.
• Pitch to VCs included a slide: "140 reasons this business will fail." Rather than playing attack-and-defend, the candour prompted investors to offer help — one claimed he could keep Amazon away because he sat on their board.
• Raised $11 million at a $45 million valuation; had term sheets from most pitches.

Growth and Amazon's attack

• Square reached 50,000 customers in a pilot within the first year.
• A patent lawsuit from a Washington University professor (Robert Morley, who had helped prototype the card reader) ran for six years before settling.
• McKelvey stepped back from day-to-day operations in 2010 after his son was born, handing off to professionals in every role he'd been covering.
• The moment Square felt real: a New Orleans taxi driver pitching McKelvey on his own product, getting the details wrong but radiating excitement about finally accepting cards.
• In 2014, Amazon launched a competing reader at lower processing fees with its brand behind it.
• Square's response: do nothing. They lacked the balance sheet for a price war.
• Amazon's product failed. Amazon mailed its departing customers a Square reader and exited the market.

The innovation stack as a moat

• Amazon copied roughly 3 of the 14 innovations Square had built; the other 11 killed the product.
• Each innovation was built out of necessity, not strategy — and the necessity came from being first. Amazon built from a boardroom.
• McKelvey frames this as the innovation stack: solving a novel problem forces a cascade of inventions, and the full stack becomes self-reinforcing protection.
• Copying the visible surface of an invention misses the structural choices that made the surface viable.

Life after Square

• Remained on Square's board as a voice for merchants; Block (Square's parent) exceeded $10 billion in gross profit.
• Subsequent projects: micropayments for journalism, a coding academy, six years as a director at the St. Louis Fed.
• Current focus: lowering the cost of drug trials from ~$100 million to ~$10 million to increase the number of shots on goal in pharmaceutical development.
• No longer working for money — describes the absence of a financial finish line as removing any natural reason to stop.
• On luck: would not use a time machine to change anything, including his mother's death — too much of who he became depends on what happened.