Edge Scanner
Every tracked market ranked by expected value — the biggest edges float to the top.
| Market | Platform | Price iLive price of the side worth buying, in cents. 38¢ = costs 38¢, pays $1 if it hits — implied 38% chance. | Fair iOur model's fair value. The probability we estimate is correct, in cents. Price should sit near this. | Edge ▾iThe edge, at the live ask. Fair value minus what it actually costs to buy right now — not the midpoint. Rows marked est have no resting ask, so they fall back to the model price. An estimate, never a guarantee. | 24h iRecent price trend from our snapshots. | Volume i24h volume. Higher = more liquid. Easier to enter and exit positions. | Action iThe move. Exactly what to buy and where. Click any row for full reasoning. We never place the trade. |
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Prediction market arbitrage: common questions
What is prediction market arbitrage?
Buying opposite sides of the same event on two different venues when the combined cost is under $1. Exactly one side pays $1 at resolution, so the gap is locked in regardless of outcome — provided both markets genuinely settle on the same criteria.
How is MarketMaster different from other arbitrage scanners?
Most scanners compare prices and tell you to verify the rules yourself. MarketMaster runs an automated verifier over both venues' resolution criteria first, and labels a pair "resolution-checked" only when they match. Pairs that have not been checked are shown but never described as risk-free.
Why do most cross-venue price gaps turn out to be fake?
Three reasons, all of which we filter for. The two contracts may resolve differently (a map winner is not a match winner). One book may be illiquid, so a stale price produces a large apparent edge. Or one leg may already be closed — Polymarket closes sports markets at game start while Kalshi's close time is a settlement deadline hours later, so a live price gets compared against a frozen one.
Does MarketMaster place trades for me?
No. It is read-only research. It never connects to your balance, never places an order, and links out to the venue so you execute there yourself.
Which prediction markets does it cover?
Kalshi and Polymarket, with every open market on both venues tracked continuously for price, fair value and cross-venue matching.
Is it free?
Yes. The full scanner, the analyzer, resolution checks and the whale feed are free. Pro adds faster alerting, a trade journal and API access.
More: market analyzer · all tracked markets · biggest movers · arbitrage calculator · API