How to find and verify prediction-market arbitrage opportunities.

A prediction market typically pays $1 for a winning contract. If a YES contract on one venue and a matching NO contract on another can both be bought for less than $1 total, the difference may create an arbitrage spread.

For example, 33 cents for YES plus 61 cents for NO equals 94 cents. Buying 100 matched contracts would cost $94 before fees and produce a $100 settlement payout if the contracts truly resolve as opposites and both orders fill at those prices.

Monster scans supported prediction markets for related contracts and displays the paired sides, spread, age, estimated depth profit, and available sizing. Start with the full opportunity row, not the headline spread alone.

Use filters to narrow the market type and sort by the metric that matters to your workflow. A larger displayed spread is not automatically better if liquidity is thin or the contracts are not equivalent.

Read the full question, outcome, end date, settlement source, cancellation language, and exception rules on both venues. Similar titles can still settle differently.

Treat the pair as research until you can explain why exactly one side should pay. If both contracts could win, both could lose, or one venue can void while the other settles, the structure is not a clean match.

Expand the opportunity to see how much capital belongs on each side for the bankroll you enter. The calculator connects the current prices to contract counts, estimated cost, payout, and return.

Use the market links to open each destination, then compare the live order books with Monster's snapshot before submitting anything.

The order-book prices you need must have enough liquidity for your intended size. Recalculate using the executable levels rather than the best displayed quote if your order would consume multiple price levels.

Match the number of contracts or the defined payout exposure on both sides. Recheck both legs immediately before acting because a partial fill or price move can leave you with an unhedged position.

You can hold both sides through settlement or evaluate an earlier exit if the market moves. An early exit is a new trade at the prices then available, so recalculate the result after fees and slippage instead of assuming the original spread is preserved.

Short-duration sports markets can resolve quickly, while political, economic, and other event contracts may remain open much longer. Match the holding period to your liquidity needs and risk limits.