Polymarket Arbitrage Tools
Polymarket arbitrage tools look for the same outcome priced differently in two places: Polymarket against Kalshi, against a sportsbook line, or against a related market on Polymarket itself. They poll several order books at once and work out whether the gap survives fees, slippage, and the capital locked up until resolution. Traders use them to take spreads that stay open for minutes, and to check an apparent edge is real before sizing into it.
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205/wk View
SpreadCore
Match live Polymarket odds against bookmaker prices, then calculate the exact stakes needed to lock profit on both sides.
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4/wk View
polymmNew
Open-source Python market-making and arbitrage bot for Polymarket sports, MIT-licensed, with a public on-chain track record you can verify.
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15/wk View
SharkBetX: Sharkbetting
Bettors spot pricing gaps fast, comparing over twenty bookmakers against exchange liquidity every thirty seconds without page reloads.
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13/wk View
Predictefy
Predictefy pulls live prices and order books from Polymarket, Kalshi, and other venues into one dashboard.
Polymarket Arbitrage Tools
Prices drift apart between venues. Kalshi says 62 on an event and Polymarket says 57, so one of them is wrong. Arbitrage tools scan several books at once, flag the gap, and show you the two trades that lock the difference in before it closes.
Speed and breadth are the whole game. Checking five sites by hand is slow, and the one you skipped is the one that had it. A scanner covers hundreds of markets a second across Polymarket, Kalshi, Manifold and the sportsbooks, and only speaks up when the spread is wide enough to survive fees.
Some tools here do something slightly different. They find categories where Polymarket is priced consistently away from external base rates or consensus forecasts. There is no hedge on the other side of that trade, but the mispricing can sit there for weeks.
How to choose a Polymarket arbitrage tool
What actually separates one from another, before you connect anything.
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What it compares
Polymarket against another venue, against a sportsbook, or one Polymarket market against a related one. These need different data and find different opportunities.
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Whether costs are included
A gap that ignores fees, gas and slippage is not an edge. Check that the number shown is what you would keep, not what the screens differ by.
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Capital lock-up
Most prediction market arbitrage ties funds up until resolution. A two percent spread over six months is not the same trade as two percent over a week, and good tools say which it is.
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Detection speed
Real gaps close quickly. If the tool refreshes on a slow timer you will mostly be reading about opportunities that have already gone.
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Execution
Some tools only alert, some place one leg, some attempt both. Attempting both is faster and carries the risk of ending up half-filled on one side.
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Rules on the other venue
The other side is often somewhere with its own account, limits and geography. Check you can actually trade there before building a strategy around it.
Is arbitrage possible on Polymarket?
Yes, and it is a normal part of how prices stay in line. The same event is often listed on more than one venue, and related markets on Polymarket itself can imply contradictory probabilities. The gaps are usually small and short-lived.
Is it risk free?
No. Fees and slippage eat thin spreads, one leg can fill while the other moves, the two venues can resolve on different criteria, and your capital is locked until settlement. The risk is different from directional trading, not absent.
How much capital do I need?
More than the spread suggests, because both legs must be funded and stay funded until resolution. Small accounts get squeezed by fixed costs long before the strategy stops working.
Can two venues resolve the same event differently?
They can, and this is the risk people underestimate. Resolution criteria and sources differ, so read both before assuming the positions cancel out.
Do these tools trade automatically?
Some do, and that is where the speed advantage is. It also means giving execution permission on both venues, so treat it with the same care as any bot with access to funds.
Other categories
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