Polymarket is the world’s largest prediction market — a place where you trade real money on what will actually happen, from elections to interest rates to whether Bitcoin closes the month above a price. In May 2026 it returned to US users as a CFTC-regulated venue after a four-year absence. This guide explains how the platform works, what it costs, whether it is legal where you are, and the specific ways to be careful before you put money on an outcome. Related reading.
Table of contents
- What is Polymarket?
- How Polymarket works
- How to start trading
- Fees and the money rails
- Is Polymarket legal?
- Ways to be careful
- FAQ
What is Polymarket?
Polymarket is a decentralized prediction market where users trade binary outcome shares on real-world events: political elections, economic indicators, sports results, entertainment, and crypto price movements. Each market resolves to a simple yes or no, and each share pays out $1 if you are right and $0 if you are wrong.
The key difference from a bookmaker is who sets the odds. Here there is no house setting a line. Prices come from an order book — supply and demand between traders — so a share priced at 63 cents means the market collectively thinks that outcome is about 63% likely. You are trading against other people, not against the platform.
How Polymarket works
Every market is a question with a defined resolution date and source. “Will X happen by date Y?” splits into two tradable shares, Yes and No, whose prices always sum to roughly $1.
If you buy Yes at $0.40 and the event happens, each share redeems for $1 — a 150% gain. If it does not happen, the share is worth nothing. You do not have to hold to resolution, though: because prices move as news breaks, you can sell your shares at any time for whatever the market will pay, exactly like trading a stock. That is what makes it a market rather than a bet slip — you are pricing probability in real time.
Under the hood, Polymarket runs on Polygon and settles in USDC, a dollar-pegged stablecoin. That combination gives it low transaction costs, fast settlement, and clean $1-denominated pricing.
How to start trading on Polymarket
Getting started takes three steps.
- Create an account and wallet. The platform provisions a wallet for you, or you connect an existing one.
- Fund it with USDC. You can buy in with a card via MoonPay for roughly a 3.5% fee, or transfer USDC directly on the Polygon network from an exchange or wallet, which is cheaper.
- Pick a market and trade. Choose Yes or No, set your amount, and confirm. Your position is visible in your portfolio and you can exit any time the market is open.
Start small. The mechanics are simple, but the discipline of sizing positions and reading a market takes practice, and the interface makes it very easy to trade more often than you should.
Fees and the money rails
The trading fee structure is light: 0% maker fees and roughly 1–2% taker fees depending on the market. The costs that catch people are the on-ramp and off-ramp — the card-purchase fee to get USDC in, and network fees to move funds — not the trading itself. If you already hold USDC on Polygon, your all-in cost to trade is low.
Is Polymarket legal?
This is the question that matters most, and the answer changed recently. Polymarket US now operates as a CFTC-regulated Designated Contract Market through its subsidiary QCX LLC, and it relaunched for US users in May 2026 across 49 states. That followed a 2022 CFTC settlement in which the company paid a $1.4 million penalty for operating without registration.
So in the US, it is now a regulated venue rather than a grey-market one — a significant shift. Outside the US, availability and legality vary by country, and prediction markets sit in different legal buckets in different places. Treat “is it legal for me?” as a question about your own jurisdiction, and check local rules before funding an account. Nothing in this guide is a ruling on your situation.
Ways to be careful on Polymarket
Prediction markets feel like insight. They are still risk. A few habits keep the platform a tool rather than a trap.
- Only stake what you can lose. A “63% likely” outcome fails 37% of the time. Markets you were sure about will still go against you regularly.
- Read the resolution rules first. The exact wording and the resolution source decide who wins. Many disputes come from traders who bought a vibe, not the precise question.
- Beware thin markets. Low-volume markets have wide spreads and can be moved by a single large trader. Your exit may be worse than the screen suggests.
- Do not confuse the crowd with certainty. The prices are a good probability estimate, not a prophecy. Markets have been badly wrong, especially on low-information events.
- Mind the tax and reporting rules that apply to you. Trading gains may be reportable where you live.
- Watch for emotional trading. Betting on elections or events you care about is where discipline breaks. If a market is personal, size it smaller or skip it.
Frequently asked questions
How does Polymarket make money if there is no house?
Through taker fees and spread, not by taking the other side of your trade. You trade against other users.
What currency does it use?
USDC on the Polygon network. Shares are priced between $0 and $1.
Can I sell before an event resolves?
Yes. You can exit any open market at the current price, just like selling a stock, without waiting for the outcome.
Is Polymarket available in the US?
Yes, since May 2026, as a CFTC-regulated Designated Contract Market in 49 states. Availability elsewhere depends on local law.
Can you trade crypto prices?
Yes. Markets on Bitcoin and other assets closing above or below set levels are common, alongside political and economic questions.
The bottom line
Polymarket turns opinions into priced, tradable probability — and, since its 2026 US relaunch, does it inside a regulated framework for the first time. That makes it one of the most interesting instruments in crypto and one of the easiest to overuse. Read the resolution rules, respect thin markets, stake only what you can lose, and it becomes a genuinely useful read on what the crowd expects to happen next.
Sources: Britannica Money · QuantVPS on the US relaunch · Changelly. Fees, availability, and regulatory status change — verify current terms before trading.
Disclaimer: General information, not financial or legal advice. Prediction-market trading carries risk of total loss. Check the law in your own jurisdiction.
