Polymarket is a prediction market. Every contract pays exactly $1 if its event happens, and $0 if it does not. The price you pay for that contract is, by construction, the market’s estimate of probability.
That sounds simple, but it leads to several non-obvious consequences worth understanding before you trade — or before you cite a Polymarket headline number.
How shares are priced
If a contract trades at 38¢, two things are true at the same time:
- A buyer is paying 38¢ for a $1 payout if the event resolves YES.
- A seller is effectively buying the NO side for 62¢ — the two prices always sum to $1.
This is why Polymarket headlines often look like polls but behave very differently. A poll moves on a sample; a market moves whenever someone is willing to take the other side.
Resolution: the part that matters most
Markets do not pay out on vibes. Each market has a written resolution criterion and a designated source — usually the Associated Press for elections, or a specific scoreboard for sports. When that source declares the outcome, the contract resolves.
Three common misreadings
- Treating the price as a forecast. It is a market-clearing equilibrium between buyers and sellers, not an oracle. A thin market can be moved by one trader.
- Confusing volume with consensus. A high-probability market with low volume is more fragile than a 50/50 market with deep books.
- Ignoring the resolution date. A market resolving in 18 months has different risk characteristics than one resolving in 18 days, even at the same price.
When prediction markets beat polls
Polls answer “what would you do today.” Markets answer “what do people willing to risk money think will happen on the resolution date.” For binary, well-defined, source-resolvable events with deep liquidity, markets have historically outperformed individual polls and roughly matched the best aggregators.
For everything else — vague events, soft sources, thin order books — treat the price as one input, not the answer.
Common questions
Is Polymarket legal in the United States?
Polymarket is geofenced from US residents and is not US-legal at the retail level. US residents who want regulated event-contract exposure should use Kalshi, which is CFTC-registered. Trading on Polymarket from a US IP violates its terms of service.
How does Polymarket make money?
Polymarket itself does not take a fee on trades. Liquidity is provided by an automated market maker on-chain, with funding rewards in some markets and protocol fees from cross-protocol activity. The economics are different from a traditional exchange.
What does a 38¢ price actually mean?
A contract trading at 38¢ pays $1 if the event resolves YES and $0 if it resolves NO. The 38¢ is both the cost to enter a YES position and the market’s estimate that the event has a 38% probability of happening. The implied probability of NO is 62%.
How are markets resolved?
Each market specifies a resolution source — typically a named regulated outlet for elections, an official scoreboard for sports, or a designated index for economic markers. Polymarket uses the UMA optimistic oracle to confirm the outcome before payouts are released.
Are prediction markets a reliable forecast?
For binary, well-defined, source-resolvable events with deep liquidity, prediction markets have historically matched or outperformed individual polls. For thin markets, vague resolution criteria, or distant resolution dates, treat the price as one input rather than the answer.
