Skip to main content

Last updated: August 2026

Polymarket Market Types Explained

Most Polymarket markets are binary: one question, two outcomes, and prices that sum to about a dollar. Multi-outcome markets extend that to several mutually exclusive results, where all the prices together should still sum to roughly a dollar. Knowing which type you are looking at tells you what the price means and where arbitrage might exist.

01.Binary markets

A binary market has exactly two outcomes, YES and NO, and holding one is economically identical to being short the other. Their prices sum to about a dollar because exactly one will pay a dollar. If they sum to noticeably more or less, that gap is a trading opportunity someone will usually close quickly.

  • Two outcomes; exactly one pays a dollar at settlement.
  • Buying NO at 66c and buying YES at 34c are the same view from opposite sides.
  • Prices summing away from a dollar is a signal worth checking.

02.Multi-outcome markets

Several mutually exclusive outcomes — an election with five candidates, for instance — where exactly one will happen. All outcome prices should sum to roughly a dollar for the same reason as a binary market. In practice they drift, especially on long-tail options nobody is quoting, and that drift is where cross-outcome arbitrage lives.

  • Exactly one outcome resolves YES; the rest go to zero.
  • Prices across all outcomes should sum to about a dollar.
  • Long-tail options are the least efficiently priced part of any such market.

04.Why the type matters before you trade

It changes what a price tells you and where mistakes hide. In a binary market, a 34c YES is simply a 34% implied probability. In a multi-outcome market, an outcome at 34c has to be read against everything else on the board, and a sum well away from a dollar is either an opportunity or a sign that something about the market is unusual.

  • Binary: read the price directly as a probability.
  • Multi-outcome: read it relative to the whole board, and check the sum.
  • Grouped: read each set of criteria separately, every time.

Related Pages

Order TypesArbitrage GuideGlossaryPolymarket Parlay Tools

Frequently Asked Questions

What types of markets does Polymarket have?▼
Mostly binary markets with two outcomes, plus multi-outcome markets with several mutually exclusive results. Markets are also often presented in groups around one event, though each grouped question resolves independently on its own criteria.
Why do YES and NO prices add up to a dollar?▼
Because exactly one of them pays a dollar at settlement. If they sum to noticeably more or less, that difference is a trading opportunity, and it usually gets closed quickly on liquid markets.
How do multi-outcome markets work?▼
Several mutually exclusive outcomes where exactly one resolves YES and the rest go to zero. All the prices together should sum to roughly a dollar, and drift from that — usually on long-tail options — is where cross-outcome arbitrage exists.
Can two markets in the same group both resolve YES?▼
Yes, unless their criteria explicitly rule it out. Grouping is a presentation choice, not a guarantee of mutual exclusivity, so read each set of criteria rather than inferring from the layout.
What does a price of 34 cents mean?▼
In a binary market, an implied probability of roughly 34%. In a multi-outcome market it means the same thing but should be read against the rest of the board, since all outcomes together should sum to about a dollar.