📡 How two 20 somethings built $10B+ prediction market empires

Good morning.

Two startups are racing to dominate a market most people didn't know existed three years ago: prediction markets.

Polymarket just raised money at a $15 billion valuation. Kalshi raised $1 billion at an $12

billion valuation in December 2025.

Together, they're processing billions in weekly volume from people betting on elections, sports, inflation, tech launches, and whether Elon will tweet today.

This isn't gambling. It's a new asset class where crowds predict the future more accurately than experts—and investors are betting billions that prediction markets will become essential infrastructure.

Today's story: How two founders took opposite paths and both built unicorns in under five years.

Hey there, Alberto here.

Prediction markets used to be academic experiments. Then the 2024 election happened.

Polymarket processed over $3 billion in bets on the election alone—and got the result right when most pollsters got it wrong. Suddenly, everyone wanted in.

Today I'm breaking down the Polymarket vs Kalshi story—how they started, why they took opposite strategies (crypto rebel vs regulatory compliance), who's backing them with billions, and why this market is just getting started.

This is one of the wildest venture stories happening right now.

Let's go.

Founded: 2020
Founder: Shayne Coplan (then 22 years old)
Valuation: $15 billion (2025)
Backers: Peter Thiel, Founders Fund, Vitalik Buterin (Ethereum founder), Polychain Capital
Strategy: Build first, ask permission never

Shayne Coplan was a college dropout obsessed with prediction markets. He believed crowds could predict the future better than experts, polls, or pundits.

In 2020, at age 22, he launched Polymarket on Polygon (an Ethereum scaling network). The concept: anyone with crypto could bet on real-world events—elections, sports, tech launches, weather, anything.

It was completely unregulated. No KYC (know your customer). No geographic restrictions. Just connect your crypto wallet and trade.

Early on, it was tiny. A few hundred users betting small amounts on obscure questions.

Then COVID happened. Polymarket added markets on vaccine timelines, lockdown policies, and case counts. Suddenly, the platform had utility—people wanted to know what would actually happen, not what governments or media said.

By late 2020, Polymarket was processing millions in monthly volume.

Fast forward to 2024. The U.S. presidential election was approaching.

Traditional polls showed a close race. But Polymarket's odds consistently favored one candidate by wider margins. Bettors—putting real money on the line—had a different read than pollsters.

Polymarket processed over $3 billion in bets on the 2024 election alone. And it got the result right.

That moment legitimized prediction markets. Media outlets started citing Polymarket odds alongside polls. Investors took notice.

Peter Thiel and Founders Fund led a massive funding round, valuing Polymarket at $5 billion by 2025.

Polymarket is a decentralized exchange where users bet on binary outcomes: "Will X happen by Y date?"

The genius move: Polymarket operates offshore (no U.S. users allowed) to avoid U.S. gambling regulations. It's technically accessible globally via crypto wallets.

This let them scale fast without waiting years for regulatory approval.

Polymarket is the dominant player globally—but it has a regulatory problem. The CFTC and DOJ are watching closely. Operating as an offshore betting exchange serving crypto users is a legal gray area.

Founded: 2018
Founders: Tarek Mansour & Luana Lopes Lara (MIT grads)
Valuation: $11 billion (December 2025, $1B round)
Backers: Sequoia, Andreessen Horowitz (a16z), Founders Fund, Henry Kravis (KKR)
Strategy: Get regulatory approval first, scale second

Tarek Mansour and Luana Lopes Lara met at MIT. Both were obsessed with the idea that markets aggregate information better than any expert.

But unlike Coplan, they didn't want to build in crypto's wild west. They wanted to do it legally in the U.S.

In 2018, they founded Kalshi with one goal: become the first CFTC-regulated exchange for prediction markets.

That meant years of paperwork, legal battles, and lobbying. No revenue. No users. Just regulatory compliance.

Most startups would've died waiting for approval. Kalshi spent three years working with the CFTC to get designated contract market (DCM) status—the same license that CME and Nasdaq hold.

In 2021, Kalshi finally launched. But the CFTC restricted what they could offer: economic indicators (inflation, jobless claims), weather events, and awards shows. No elections. No sports.

Kalshi operated in this limited sandbox for two years, slowly building a user base among finance geeks betting on CPI prints and Fed decisions.

Then in 2023, Kalshi won a landmark legal battle: the CFTC approved political event markets, including elections.

That was the breakthrough.

In 2024, Kalshi launched election markets just as Polymarket was dominating offshore.

U.S. users who couldn't access Polymarket flocked to Kalshi. It was legal, regulated, and you could fund it with your bank account—no crypto needed.

Then Kalshi made another genius move: they realized sports betting could be classified as "event contracts" rather than gambling under certain structures.

By late 2024, Kalshi was offering NFL, NBA, and MLB markets. Americans could bet on football games directly through Kalshi using USD.

Volume exploded. By fall 2025, Kalshi was processing over $1 billion per week, often outpacing Polymarket.

In one October 2025 week, Kalshi had 70% of all prediction market volume, driven almost entirely by NFL betting.

Kalshi is a traditional exchange, not a crypto platform:

Kalshi is the "safe" version of Polymarket. It's more expensive (fees), more restrictive (KYC, limits), but completely legal in the U.S.

Kalshi's advantage: it can advertise openly in the U.S., partner with banks and brokerages, and onboard mainstream users who'd never touch crypto.

These companies took opposite strategies and both won:

The irony: Founders Fund invested in both. Peter Thiel is betting on both models.

Why? Because they're not really competing yet.

Polymarket owns global crypto users and international markets. Kalshi owns U.S. compliance and mainstream adoption.

But that's changing.:

Polymarket is launching a U.S.-compliant platform.

They acquired QCX (a regulated derivatives exchange) and are rebranding it as "Polymarket US." This will let them offer prediction markets to Americans legally, competing directly with Kalshi.

Kalshi is exploring crypto integrations.

They're rumored to be adding stablecoin deposits and possibly launching markets on crypto-native platforms to capture Web3 users.

By 2026, we could see the same markets on both platforms:

This is shaping up to be a duopoly—with both companies racing to capture the other's users.

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Prediction markets aren't just betting. They're information infrastructure.

Here's why investors are pouring billions into this space:

1. Markets predict better than experts.

Polymarket got the 2024 election right. Polls didn't. When people bet real money, they're more honest than when they answer surveys.

2. They're faster than traditional research.

Want to know if a product will launch on time? Create a prediction market. You'll get a probability in hours, not weeks.

3. They scale globally.

Sports betting is a $200+ billion market. Political betting could be $50+ billion. Add finance, tech, geopolitics—prediction markets could be a trillion-dollar industry.

4. They're infrastructure, not just consumer apps.

Hedge funds are already using Polymarket data to inform trades. Media outlets cite prediction market odds. This becomes essential decision-making infrastructure.

5. Regulatory clarity is coming.

The CFTC's approval of Kalshi signals that regulated prediction markets are viable. That opens the door for institutional capital.

Polymarket and Kalshi are both unicorns in a market that didn't exist five years ago.

Both are valued at $9-12 billion. Both are processing billions in weekly volume. Both are backed by top-tier VCs.

Here's the bull case:

Market size: Sports betting alone is $200B+ globally. Prediction markets could be 5-10x that across all verticals.

Network effects: Liquidity attracts more liquidity. The platforms with the most users and volume win. Polymarket and Kalshi are already the leaders.

Regulatory moat: Both have either avoided regulation (Polymarket offshore) or obtained it (Kalshi CFTC approval). New entrants face massive barriers.

Revenue potential: Kalshi charges fees. Polymarket plans to monetize via market-making, data licensing, and B2B products.

IPO path: Both could go public in 2-3 years. A $10B+ valuation today could be $50B+ post-IPO if adoption continues.

Not everything is perfect:

Regulatory risk (Polymarket): Operating offshore as an unregulated betting exchange is risky. The DOJ or CFTC could shut them down or fine them heavily.

Competition (Kalshi): Sports betting is dominated by DraftKings, FanDuel, and traditional sportsbooks. Kalshi needs to prove it can compete long-term.

User concentration: Both platforms rely heavily on a few power users. If those users leave, volume collapses.

Ethical concerns: Prediction markets blur the line between betting and information. Regulators could crack down if they view it as gambling, not "event contracts."

Monetization unclear (Polymarket): Polymarket doesn't charge fees yet. How will they make money long-term?

✅ If you believe:

❌ If you believe:

Polymarket and Kalshi took opposite paths—crypto rebel vs regulatory compliance—and both built $10B+ companies in under five years.

This isn't a zero-sum game. Both can win.

Polymarket dominates globally and in crypto. Kalshi dominates in the U.S. and with mainstream users.

The real question: Is prediction markets a $100B market or a $1T market?

If it's the latter, both companies are just getting started.