Prediction markets 101
What is a prediction market?
It is a market where you trade the answer to a question. Each question has a YES share and a NO share; whichever turns out right pays $1 per share, the other pays nothing. Because of that, a share’s price works as the crowd’s estimate of the chance it happens.
Hypothetical YES at 34¢, NO near 66¢.
Four parts of every market
One question with an end date
“Will Bitcoin close above $90,000 on Friday, per the named index?” A market asks exactly one thing and names the source that will settle it.
Two sides
You can buy YES or NO. There is no bookmaker setting odds against you; the price moves as people trade.
A price that moves
News arrives, people trade, and the price goes up or down. It reads like a scoreboard of what traders collectively expect.
Settlement
When the event is decided, correct shares redeem for $1 and incorrect shares for $0. On 369X that happens after a 48-hour challenge window.
Why does a price read as a probability?
Because the payout is fixed at $1. If you believe something has a 70% chance, a YES share is worth about 70¢ to you. Pay less and you think you have an edge; pay more and you don’t. Across many traders the price settles where buyers and sellers disagree evenly, which is why 58¢ is read as “about 58%”.
58¢ YES at 58¢ means the market prices about a 58% chance. NO trades near 42¢.
The grid shows the theoretical price. What you actually pay also includes the 2% fee and price impact, covered in the price-reading guide.
A worked YES/NO example
Hypothetical market Will the home side win the cup final?
YES trades at 58¢ and NO at about 42¢. You buy YES at 58¢.
- If the home side wins
- Each share redeems for $1: about 72% more than you paid, or about 69% after the 2% fee, before price impact.
- If they don’t
- Each share is worth $0. You lose what you paid.
- If you change your mind
- Sell before the cut-off at whatever the live price is. It might be 70¢ after an early goal, or 35¢ after a red card.
Trading versus holding to the end
You don’t have to wait for the result. Some people buy early and sell once the price moves their way; others hold to settlement. On 369X you can sell back to the market maker at the live price until 1 hour before expiry. Each sale is its own trade and pays its own fee.
What people use them for
A forecast you can read
When people must put money behind a view, loud opinions with nothing at stake don’t move the price. Journalists and analysts increasingly watch market odds on elections and rate decisions.
Hedging a real risk
A business worried about a rate rise can hold YES on “rates rise”. A fan can hold NO on their own team. The payout offsets a loss elsewhere.
Testing your judgment
Leaderboards that rank by return on what was risked show who forecasts well, not who trades most.
Pricing niche questions
A regional election or a domestic league that bigger venues ignore can get its own market on 369X through a user request.
- Crypto
- Finance
- Sports
- Politics
- Culture
- AI
What a price can’t tell you
- A price is an estimate, not a fact. Markets priced at 80% should be wrong about one time in five.
- Thin markets move easily. A few trades can shift a quiet market a long way.
- Incentives matter. Someone hedging, or trying to move a headline number, may trade against their true belief.
- Theoretical YES and NO prices add to $1. The amount you actually pay also includes fees, spreads and price impact.
Is it the same as betting?
The mechanism differs: prices come from traders rather than a bookmaker who profits when you lose, and 369X’s market maker is software with a capped subsidy. The economics and the law can still overlap with betting, and some regulators treat prediction markets as gambling. Rules vary by country, so check where you live. The full comparison.