Polymarket Glossary: 50 Terms Every Trader Should Know
New to Polymarket? This glossary defines 50 essential terms, including shares, limit orders, liquidity, gas fees, and market resolution, in clear language.
Polymarket has its own language. Some words come from finance, some from crypto, and some from the way prediction markets settle. Mixing them up costs money, because a trader who misreads "maker" or "resolution source" trades on the wrong assumption.
This Polymarket glossary defines the 50 terms you meet most often, grouped so you can find them fast. Start at the top if you are new, or jump to the section you need. Each definition stays plain and tells you why the term matters when you trade.
Bookmark this page. Most beginner losses trace back to a term someone skipped, usually in the resolution rules.
Market Basics
These ten words form the foundation. Learn them first, because every other section builds on them.
| Term | What it means |
|---|---|
| Prediction market | A market where people trade on the outcome of a future event. The price of each outcome reflects the crowd's estimate of how likely it is. |
| Market | A single question on Polymarket, such as "Will the Fed cut rates in September?" Each market has its own outcomes, prices, and rules. |
| Outcome | One possible answer to a market's question. A simple market has two outcomes, Yes and No. |
| Share | A contract tied to one outcome. A winning share pays one dollar at resolution, and a losing share pays zero. Polymarket also calls these outcome tokens or conditional tokens. |
| Yes share | A share that pays one dollar if the event happens. You buy Yes when you think the market underrates the chance. |
| No share | A share that pays one dollar if the event does not happen. You buy No when you think the market overrates the chance. |
| Binary market | A market with two outcomes, Yes and No. The two prices add up to about one dollar. |
| Multi-outcome market | A market with several possible answers, such as "Who wins the election?" with one share type per candidate. |
| Resolution | The moment a market settles to a final answer. Winning shares become worth one dollar and losing shares become worth zero. |
| Payout | The money you collect when your shares win. Each winning share converts to one dollar in USDC. |
Prices and Odds
On Polymarket the price is the probability. This section explains the numbers you read on every market page.
| Term | What it means |
|---|---|
| Implied probability | The chance the market assigns to an outcome, read straight from the price. A 65-cent share implies a 65 percent chance. |
| Price | What one share costs right now, quoted between 1 and 99 cents. The price moves as people buy and sell. |
| Bid | The highest price a buyer is willing to pay for a share at this moment. |
| Ask | The lowest price a seller is willing to accept for a share at this moment. |
| Spread | The gap between the bid and the ask. A wide spread signals low liquidity and a higher cost to trade. |
| Mid price | The midpoint between the bid and the ask. Traders use it as a fair-value reference. |
| Last price | The price at which the most recent trade filled. It can sit away from the current bid and ask in a quiet market. |
| Settlement | The accounting step after resolution that pays out winning shares and zeroes losing ones. |
Orders and Trading Mechanics
How your trade reaches the Polymarket order book, and what it costs to get filled.
| Term | What it means |
|---|---|
| Market order | An order that fills right away at the best available price. Fast, but you pay the taker fee and risk slippage. |
| Limit order | An order that fills only at a price you set or better. It may wait on the book, and it pays no maker fee. |
| Maker | A trader who posts a limit order that adds liquidity to the book. Makers pay no trading fee on Polymarket. |
| Taker | A trader who fills an existing order and removes liquidity. Takers pay a small fee. |
| Fill | A completed trade. A partial fill means only part of your order matched. |
| Order book | The live list of buy and sell orders at each price. It shows you where liquidity sits above and below the current price. |
| Position | The shares you hold in a market, plus the profit or loss riding on them. |
| Slippage | The difference between the price you expected and the price you got. Large orders in thin markets cause it. |
| Cash out | Selling your shares before resolution to lock a gain or cut a loss. You do not have to hold to the end. |
Liquidity and Market Structure
These terms tell you how easy a Polymarket market is to trade and how its prices get set.
| Term | What it means |
|---|---|
| Liquidity | How much you can trade without moving the price. High liquidity means tight spreads and easy fills. |
| Liquidity provider (LP) | A trader who posts orders or supplies capital so others can trade. LPs can earn rewards for adding depth. |
| Volume | The total value traded in a market over a period. High volume points to active interest and better pricing. |
| Open interest | The total value of shares currently held in a market. It shows how much money sits at stake right now. |
| Depth | The size of orders waiting at each price. Deep books absorb big trades with little slippage. |
| Thin market | A market with low liquidity and few orders. Prices jump on small trades, and slippage runs high. |
| CLOB | Central limit order book, the system Polymarket uses to match buyers and sellers at set prices. |
| AMM | Automated market maker, a formula-based system that some prediction markets use to price trades instead of an order book. |
Resolution and the Oracle
A market is only as trustworthy as the way it settles. These five terms decide who gets paid.
| Term | What it means |
|---|---|
| UMA Optimistic Oracle | The decentralized system that reports most Polymarket outcomes. A result stands unless someone disputes it within a set window. |
| Resolution source | The evidence a market uses to decide the answer, named on the market page. Read it before you trade, because it defines Yes and No. |
| Proposer | The participant who submits the proposed outcome to the oracle after an event ends. |
| Dispute | A challenge to a proposed outcome. When someone disputes, token holders vote to settle the question. |
| Negative risk | A feature in multi-outcome markets that lets you hold No positions across several outcomes more efficiently, since one of them must be true. |
Wallet, Funding, and Fees
The money side. Knowing these keeps your real costs clear.
| Term | What it means |
|---|---|
| USDC | A dollar-pegged stablecoin and the currency for every Polymarket trade. One USDC equals one dollar. |
| Polygon | The blockchain Polymarket runs on. It keeps gas fees low compared with the main Ethereum network. |
| Proxy wallet | The wallet Polymarket creates for you in the background so you can trade without managing crypto by hand. |
| Gas fee | The network cost to move funds on Polygon, paid in network tokens. It runs to a few cents per action. |
| Relayer fee | The fee on deposits and withdrawals, set at the greater of $3 or 0.3 percent of the amount. |
| Bridge | A tool that moves your USDC from another network onto Polygon so you can fund your account. |
Strategy and Trader Slang
The words Polymarket traders use to talk about edge and the people who have it.
| Term | What it means |
|---|---|
| Whale | A trader who moves large size. Whale buys and sells can shift a market's price on their own. |
| Smart money | Traders with a track record of profit, also called sharps. Many tools let you watch their wallets and copy their moves. |
| Edge | A reason you expect to win more than the price implies, such as better information or a careful read of the rules. |
| Adverse selection | The risk that the trader filling your order knows something you do not. Makers in fast-moving markets face it most. |
Use the Words, Then Use the Tools
A glossary gets you reading Polymarket markets correctly. The next step is putting the terms to work on a live market, where prices, the order book, and the resolution source all sit in front of you.
Browse the PolyMart tools directory to find analytics dashboards that show liquidity and volume, trackers that follow smart-money wallets, and alert bots that flag price moves. Pick one tool, open one market, and read it line by line using the terms above before you place a trade.
