I started trading prediction markets about three years ago. My first trade was a small position on the 2024 election outcome, and I lost it. The candidate I backed lost. That is the thing about prediction markets. They are brutally honest. The market does not care about your opinion. It only cares about what the crowd believes, and the crowd is usually right.
The World Cup on Polymarket has been the biggest test of prediction markets as a product category. Over $2.34 billion in volume on the tournament winner market alone. Millions of individual trades. Thousands of active markets ranging from match winners to exact scorelines to which player scores first. It is the most liquid prediction market environment that has ever existed.
If you are a crypto trader and you have not looked at Polymarket during this World Cup, you are missing something interesting. Here is how to get started.
Setting up your account
Polymarket runs on Polygon. You need a wallet and some USDC to participate. The setup is straightforward but there are a few gotchas that I hit the first time.
Go to polymarket.com. Click connect and choose your wallet. MetaMask works, as does WalletConnect. If you are using MetaMask, make sure you have the Polygon network added. Polymarket will prompt you to switch if you are on the wrong network, but it is smoother if you are already on Polygon.
You need USDC on Polygon to trade. If you have USDC on Ethereum, you can bridge it over. Polymarket has a built in bridge option or you can use your preferred bridge. If you are starting from scratch on a centralized exchange, buy USDC and withdraw it directly to Polygon. Most major exchanges support Polygon withdrawals now.
The minimum trade is small enough that you can start with fifty dollars and get a feel for how the markets behave. I recommend starting small. The mechanics are simple but the psychology is different from spot trading, and it takes a few trades to get used to it.
How the markets work
Every Polymarket market is a binary or multiple choice contract. You buy shares in the outcome you believe will happen. If you are right, each share pays out $1 at settlement. If you are wrong, the share expires at $0.
The share price represents the market's implied probability. If a team is trading at $0.65 to win a match, the market is saying there is a 65 percent chance they win. If you think the real probability is higher than 65 percent, you buy. If you think it is lower, you sell or buy the opposite.
This is the same logic as futures trading or options pricing, but simplified to a single number. There is no expiry complexity, no strike price ladder, no Greeks. Just a probability between zero and one that resolves to either $1 or $0.
The simplicity is what makes prediction markets powerful. You do not need to be a derivatives expert to trade them. You need to have a view on an outcome that differs from the market's consensus. That is it.
Reading the markets for value
The skill in prediction market trading is not in picking winners. It is in finding mispriced probabilities. A market that has a team at $0.80 when you believe the true probability is $0.70 is a sell, even if you think the team will win. The edge is in the probability, not the outcome.
During the World Cup, the mispricing tends to cluster around a few patterns. The first is public sentiment bias. Big name teams with global fan bases trade higher than their actual probability, because more people want to bet on them. France and Argentina tend to be slightly overpriced relative to the analytical models. Smaller teams like Norway or Morocco tend to be underpriced because fewer people are buying their shares.
The second pattern is overreaction to single matches. If a team wins a group stage match impressively, their next match price jumps. The market overweights the most recent data. If you think the win was a fluke or the opponent was weak, there is a trading opportunity on the other side.
The third is the draw factor. In knockout matches, draws lead to extra time and penalties. The implied probability of a draw is often underpriced early in the week and overpriced as the match approaches. I have found the best value is usually about 48 hours before kickoff, when the casual money starts flowing in.
Managing risk
The all or nothing structure of prediction markets creates a different risk profile from spot trading. A 10 percent move in a token is a 10 percent gain or loss. A 10 percent move in a Polymarket share is a change in implied probability, not a direct change in your position's value. Your position either ends at $1 or $0. The path between now and settlement is noise.
That means position sizing matters more than timing. If you put 10 percent of your portfolio into a single market and you are wrong, you lose 10 percent. There is no partial recovery. The share either pays out or it does not.
I limit any single market to 2 to 3 percent of my prediction market capital. That way I can be wrong several times in a row without taking material damage to my portfolio. And I will be wrong sometimes. Everyone is.
The other risk management rule is to have an exit plan before the match starts. Polymarket markets can be traded up until the event resolves, but the liquidity dries up during the match. If you want to close a position before settlement, do it before kickoff. Trying to trade during the match is possible but the spreads widen significantly and you might not get filled at a reasonable price.
A practical example
Let me walk through a real example from this week's quarterfinals. France versus Morocco on July 9. France is the heavyweight. Morocco made a run in 2022 and has looked solid again this tournament.
You check Polymarket and France is trading at $0.72. You think that is a fair price for the match win, maybe slightly rich given Morocco's form. Instead of buying France, you look at the exact scoreline market. France 2-0 is trading at $0.08. You think that is the most likely scoreline given France's defensive solidity and Morocco's disciplined shape. You buy a small position. If you are right, you get 12.5 to 1 odds. If you are wrong, you lose the premium.
That is the prediction market edge. You are not limited to binary win/loss bets. You can trade granular outcomes where the mispricing is larger. The trade off is that your edge is harder to estimate. A 2-0 scoreline is less likely than a France win, obviously, but the question is whether the $0.08 price understates the real probability. If the real probability is 12 percent and the market is pricing it at 8 percent, you have a 50 percent edge. That is worth taking.
Tax implications
This is the part nobody talks about. Prediction market profits are taxable in most jurisdictions. The IRS treats them as ordinary income or capital gains depending on your trading frequency and intent. Polymarket does not issue tax forms for every trade, but they do track your activity. If you win significant amounts, expect to report it.
The record keeping is on you. Polymarket provides transaction history exports. Download them regularly and keep organized records. Trying to reconstruct six months of trades from the blockchain at tax time is a nightmare I have lived through.
The crypto advantage
Polymarket matters for crypto traders beyond just the trading opportunity. It is one of the clearest demonstrations of what blockchain enables that traditional finance cannot replicate. Instant settlement, transparent markets, no counterparty risk, global accessibility. The World Cup is proving that these features matter at scale, not just for niche crypto use cases.
If you are already holding USDC and using DeFi, adding Polymarket to your toolkit costs nothing. The same wallet, the same stablecoin, the same network. It is an additional use case for capital you already have. That is the thesis behind prediction markets as a crypto killer app.
The quarterfinals start Thursday. The markets are live. The liquidity is deeper than it has ever been. If you have been curious about prediction markets, this is the moment to try them with a small position and see how they feel.