When the same event trades at two prices on two venues, it can look like a guaranteed profit. Most of the time the gap is paying you for a risk or a cost you have not noticed yet.
Arbitrage is the idea of buying the same outcome cheaply on one venue and selling it dearly on another, or buying both sides of a question across venues so the combined cost is under one dollar, locking in the difference whatever happens. In textbooks it is risk free. In real prediction markets it almost never is, because the two contracts rarely resolve on identical terms, fees and spreads eat the gap, your money is locked up while you wait, and the venues may not both be legally available to you. This page explains the concept honestly so you can spot why an apparent edge usually is not one. It is information, not a strategy, and not advice.
Two venues can quote what looks like the same event while resolving it differently. The wording, the cutoff time, the source of truth, and the treatment of edge cases can all differ. If one contract settles on a provisional result and the other waits for an official confirmation, you do not hold two copies of one bet, you hold two different bets that can disagree. A price gap often pays you for that difference, not for nothing.
You rarely trade at the mid price. You buy at the offer and sell at the bid, and the venue takes fees on top. A two cent gap between platforms can vanish entirely once you cross both spreads and pay to enter and exit on each side. Apparent arbitrage is quoted in mid prices, but you trade in real ones, and the difference is exactly where the easy money was supposed to be.
To hold both sides you tie up money on two venues, sometimes for weeks or months, until the market settles. That capital is not free, it carries risk while it sits, and you cannot use it elsewhere. A small locked in edge spread over a long wait can be a poor return for the risk, and it disappears if anything goes wrong with either platform in the meantime.
An arbitrage only pays if both venues actually settle and let you withdraw. A decentralized venue depends on an oracle and a dispute process. A centralized one depends on the operator staying solvent and available. If one side delays settlement, disputes the result, freezes withdrawals, or fails, your supposedly risk free position becomes a real and possibly total loss on that leg.
Many venues are only lawfully available in some places, and some are not available to you at all. A strategy that requires trading on two specific platforms can be impossible, or unwise, if one of them is not legally available where you live. Availability changes with regulation, which moves fast in this category, so a route that existed last month may be closed now. Check our legality hub and your own eligibility first.
Suppose a yes contract trades at fifty one cents on one venue and you could sell the same outcome at fifty three cents on another. On paper that is a two cent edge. Now cross the spread on each side, pay entry and exit fees on both, and wait for both to settle. After costs the two cent gap can easily become a loss, and that is before any difference in how the two contracts actually resolve.
Illustrative only. Not a strategy, not a recommendation, and not a claim that any real gap exists. Prices and fees change and any position can lose.
The useful habit is to assume a visible price gap is the market paying you for something, then go looking for what that something is. Read both sets of resolution rules side by side. Add up the fees and the spreads you would actually cross. Ask how long your money is tied up and what happens if one venue delays or disputes settlement. By the time you have answered those questions honestly, most apparent edges have explained themselves away.
None of this means prices are always efficient. They are not, especially in thin markets. It means that capturing a real difference is harder, slower, and riskier than it looks, and that the people most confident about easy cross platform profit are often the ones who have not counted the costs. We do not publish strategies or tip trades. We explain the mechanics so you can judge for yourself, and so you can see when a sure thing is quietly carrying a risk of loss.
It helps to know why prices drift apart in the first place. Venues attract different crowds, so a topic that excites one community can be priced more keenly there than on a quieter book. Money moves slowly between platforms, especially when funding, withdrawals, or on chain transfers take time, so a gap can persist simply because few people can act on it quickly. And different fee schedules mean the real cost of trading the same outcome is not the same everywhere, which shifts where each price settles.
Seen that way, a gap is usually the market paying for friction rather than handing out free money. The traders who could close it may be blocked by cost, by capital, by time, or by the rules of where they live. That is also why apparent edges can sit in plain sight without vanishing. If closing a gap were truly free, it would already be closed. The fact that it is not is a strong hint that a cost or a risk is hiding inside it, waiting for someone who has not counted it.
Cross platform arbitrage is marketed as risk free far more often than it is risk free. Hidden costs and settlement risk can turn a sure thing into a real loss. Stake only what you can afford to lose, never to chase a loss, and never on borrowed money. If it stops feeling like a free choice, step back. In the United States you can call or text the helpline on 1-800-GAMBLER or visit ncpgambling.org.
It is the idea of profiting from the same outcome being priced differently on two venues, either by buying low and selling high or by buying both sides so the combined cost is under one dollar. In practice it is rarely risk free.
Because the contracts often resolve on different terms, fees and spreads eat the gap, your capital is locked up while you wait, and settlement or counterparty problems can cause a real loss on one leg.
No. A gap usually compensates for a difference in the contracts or a cost you have not counted. Reading both sets of rules and adding up the real costs usually explains the gap away.
No strategy here is safe. This page is an explanation, not advice, and not a strategy to follow. Any position can lose, and apparent arbitrage carries settlement and availability risk that is easy to underestimate.
Not necessarily. Many venues are only lawfully available in some places, and availability changes with regulation. Check our legality hub and your own eligibility before assuming a route exists.
The rules change fast. Get the changes that affect you, plain and current, not tips.
Independent. Every claim dated and sourced. No platform pays for its place.