How Does Polymarket Make Money With No Trading Fees?
Short answer: investor money funds growth now, the platform earns yield on the pool of user deposits it holds, and "no trading fees" has never meant trading is costless for you. This question deserves a straight answer because "how does the free thing make money?" is exactly the right instinct — and here it has a non-sinister one.
Not the casino model — start there
A casino profits when you lose; that's the whole business. A prediction market is a venue: your loss becomes another trader's win, and the platform earns from operating the marketplace, not from your mistakes. (More on this in are prediction markets gambling?) So "how do they make money" isn't asking who's cheating you — it's asking how a venue pays its bills.
Revenue source 1: investor funding, the startup play
Polymarket has raised very large venture rounds. The strategy is the one you've seen from a hundred startups: charge nothing, grow the user base into the market leader, and monetize the position later. Free trading isn't charity; it's marketing spend. It also explains why fee structures can change as platforms mature — which is why "check the current fee page" appears in every guide we write.
Revenue source 2: float — the quiet one
Deposit money on any exchange and it sits somewhere while you trade. That pooled balance is called float, and holding a large float lets a platform earn interest-like yield on it. Polymarket balances live in the USDC stablecoin, and yield on large stablecoin pools is a real, established income stream. Banks have run on this exact principle for centuries; crypto rails just made it visible to anyone who asks.
What you still pay, even at "zero fees"
Three quiet costs never show up as a fee line. The spread: the gap between buy and sell prices, paid on entry and exit. Slippage: your own order pushing the price in thin markets. Network costs: moving money on crypto rails can carry small charges depending on how you fund. On a $50 trade these are cents to a dollar or two — real, just not a scandal. All three live in the glossary.
The contrast: Kalshi's traditional model
Kalshi publishes an explicit fee schedule and charges per trade — the classic exchange model, no mystery. Neither approach is virtuous or sinister; they're different answers to the same bill-paying problem. The practical takeaway for you sits in the Polymarket vs Kalshi comparison: know the total cost of a round trip on whichever venue you choose.
Understand the machine before you feed it
Polywise teaches how the whole machine works — prices, fees, spreads, resolution — through free game-like lessons. No deposit, no account, no fine print.
Learn the full machine free →Frequently asked questions
Is Polymarket really free to trade on?
Polymarket built its reputation on charging little or nothing per trade, but "free to trade" never means "free to use." You still pay through the spread when entering and exiting, possible network costs on crypto rails, and any fees the platform introduces over time. Always check the current fee page before depositing.
How can a prediction market survive without trading fees?
Mainly two ways: investor funding to grow first and monetize later (the classic startup play — Polymarket has raised large venture rounds), and earning yield on the pool of user deposits sitting on the platform, known as float. Exchanges holding large balances can earn meaningful interest-like returns on that pool.
If the platform doesn't profit when I lose, who takes my money?
The trader on the other side of your position. Prediction markets are peer-to-peer: your loss is another user's win, minus any fees. The platform is the venue, not your opponent — the key structural difference from a casino or sportsbook.
How does Kalshi make money compared to Polymarket?
Kalshi charges explicit trading fees on most contracts, published on its fee schedule — the traditional exchange model. Different revenue strategy, same peer-to-peer structure: on both platforms you trade against other people, not the house.
Why should a beginner care about the platform's business model?
Because incentives explain behavior. A venue that profits from volume wants you trading often — that's what free trades encourage. Knowing the house isn't betting against you, but does want you active, is the right frame for deciding how often to trade.