New to prediction markets, or just want to understand what the numbers mean? These guides start from zero and get practical fast: how prices work, what you are actually buying, how the main platforms differ and what to check before you put money in.
Start here: What are prediction markets? · Prediction markets vs sports betting · Spreads, liquidity and limit orders · Glossary. Using crypto? See our crypto guides.
What are prediction markets?
How a $1 share becomes a live probability, why markets are often right, and the risks to know first.
Open →What is Polymarket?
How the biggest prediction market works, how it makes money, and whether it's legit and legal where you live.
Open →What is Kalshi?
How the US-regulated exchange works, its fees, legal status, minimum age and how to start.
Open →How old do you have to be to use Kalshi?
18, not 21: why, and the push to raise it.
Open →Can you parlay on Kalshi?
Yes, with combos: how they work and how to judge the price.
Open →Can you parlay on Polymarket?
Yes, since June 2026: how combos work, fees and the US app.
Open →Kalshi glossary
Every term in the Kalshi app, in plain English.
Open →Polymarket fees
Taker rates by category, maker rebates and worked examples.
Open →Kalshi fees
The fee formula, maker fees and deposit costs, with worked examples.
Open →Polymarket deposits and withdrawals
Networks, pUSD, timing and why withdrawals fail.
Open →Kalshi deposits and withdrawals
Every method, its fees and how long payouts take.
Open →How does Kalshi make money?
Fees, funding, and how careful traders approach it.
Open →How does Polymarket make money?
Fees, ICE, funding, and how careful traders approach it.
Open →How to buy on Polymarket
Step by step, on the website and the US app.
Open →How to sell or cash out early
Selling before the end, and how payouts work.
Open →How prediction markets resolve disputes
UMA's oracle vs exchange review, and timelines.
Open →Prediction market glossary
Every term you'll meet, in plain English.
Open →Spreads, liquidity and limit orders
What a trade really costs, with worked examples.
Open →Prediction markets vs sports betting
Exchange vs bookmaker, side by side.
Open →How old do you have to be to use Polymarket?
18, plus the age of majority where you live.
Open →Novig fees
Free pre-game trades; taker fees on live and futures.
Open →Robinhood prediction market fees
How much does Robinhood charge for prediction markets? Two things: Robinhood's own commission, which since June 1, 2026 depends on the contract…
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