How to compare prediction market platforms: A beginner’s guide

Money

A market headline might give an election outcome a 60% chance. That percentage comes from contract prices and may differ from the price you can actually trade at.

Before risking money, understand what the contract covers, what it costs and whether you’re allowed to buy it at all.

Key Takeaways

• Check access first. A website that loads for you does not establish your eligibility or legal permission to trade where you live.
• Understand the full cost. Account for trading fees, the gap between buying and selling prices and any payment charges.
• Read the rules. The resolution source, deadline and cancellation terms decide how a market settles.
• Practise before risking money. Watching markets or using play money lets you learn without moving to cash trading.

Understand What You Are Buying

A platform is the venue: the exchange, app or website that lists markets. A market is a question about an event, such as whether a named candidate wins.

In a simple binary market, you buy a YES or NO contract, and the market settles according to which outcome occurs. On Polymarket, holders of winning tokens redeem them for $1 each and losing tokens become worthless, but other operators may design contracts differently.

Price versus probability. For a binary contract that pays $1 if YES wins, a YES price of $0.60 implies a 60% chance. That figure reflects current trading, not a verified probability or a guarantee.

Payout versus profit. Suppose you buy ten YES contracts at a hypothetical $0.60 each, paying $6 up front. If YES wins, the gross payout is $10 and the profit is $4 before fees; if NO wins, you lose the $6.

The rules decide the result. Read beyond the headline for the resolution source, the deadline and what happens if the event is postponed or cancelled.

Selling before settlement is not guaranteed. You can sell only if trading remains open and your order can execute. Otherwise your money may stay tied up until settlement.

Compare Platforms With a Practical Checklist

Start with platforms whose eligibility rules, costs and contract terms you can read and understand. These five checks help you judge whether a platform fits your circumstances.

Eligibility and oversight. Confirm age, residence and physical-location requirements, and identify the legal operator and its regulator. US oversight of sports contracts remains disputed: on September 10, 2026, Connecticut announced nine cease-and-desist orders against operators it said were running illegal prediction markets, though that was the state’s position rather than a nationwide ruling.

In Great Britain, the Gambling Commission said on February 4, 2026 that commercial products meeting the gambling definition must be licensed and regulated by it. The US CFTC also recommends checking a firm’s registration and disciplinary history, while warning that a clean record does not prevent fraud.

Total costs. Separate transaction fees, the buy-sell spread and any payment or withdrawal charges. Kalshi says its fees differ between markets and Polymarket documents trading fees on certain markets, so read the schedule for the specific market you would trade.

Clear settlement rules. Look for platforms that publish each market’s resolution source, deadline and cancellation treatment in plain language, and explain who decides a disputed outcome.

Funding and custody. Check who controls deposited money, how withdrawals work and how you would recover account access. A blockchain-based setup does not by itself guarantee the safety of your funds.

Usable prices and support. The spread is the gap between the highest price a buyer bids and the lowest price a seller asks, so the percentage on screen may not be a price you can trade at. Check whether enough opposing orders exist for your intended amount and how you would reach support.

For a head start, the best prediction markets comparison from Prediction Markets Best gathers published fees, access restrictions and settlement rules for 57 platforms, researched from operators’ own documents and regulator registers. Each gets an Editor Score from 0 to 10 across nine published criteria, with a written note for every criterion assessed and unassessed criteria left unrated.

These are editorial assessments, and funded-account test results appear only where a review includes a dated test record. Check the operator’s current terms and your local rules before relying on any listing.

Practise First and Decide Whether Trading Fits

Observe without depositing. Choose one clearly defined event and record the displayed probability, the resolution source and the deadline. Check the outcome at settlement, repeat a few times and note whether the rules resolved the question as you expected.

Try play-money practice. Manifold offers play-money forecasting, and its FAQ says every user starts with M1,000 of mana, which cannot be converted to cash. Optional mana purchases also exist, so keep the free starting balance separate from paid extras in your mind.

Practice success does not mean real-money trading would be profitable. Cash trading adds fees, spreads and the risk of losing the full purchase price.