Match the same question across Polymarket and Kalshi, price both taker legs from each venue's published schedule, and see what is left.
Both taker legs priced from each venue's published schedule, every minute. Only pairs matched with high confidence, that still show an edge once the round trip is paid, appear here.
Both venues' full market lists are read every minute and paired where they resolve on the same event. A false match is an unhedged directional bet wearing an arbitrage costume, so anything below high confidence is held back for human review rather than shown.
Each leg is costed from that venue's own published schedule: Polymarket by market category, Kalshi at its taker rate with the whole-cent rounding it actually applies. Both legs, not the cheaper one.
Gross spread minus the full round trip. Most pairs do not survive it. When none do, the scanner says so plainly instead of lowering the bar until something qualifies.
Both venues charge on the same shape,
rate × contracts × P × (1 − P), so the cost of a pair peaks
where the market is least certain and thins out towards either end. That is why a coin‑flip
market has to clear 2.75% before it is worth touching, and why almost every spread that
survives its fees is a long shot priced in single‑digit cents.
Computed from the two rates published by each venue, the same ones the scanner uses. Fee schedule 2026‑08‑04.a.
OpenAI $1t IPO before 2027Polymarket ↔ Kalshi · entry $0.9296−$7.45
Mamdani freezes NYC rentsPolymarket ↔ Kalshi · entry $0.8784−$10.06
No Fed rate cuts in 2026Polymarket ↔ Kalshi · entry $0.8573+$2.82
Hyperliquid airdrop by 31 DecPolymarket ↔ Kalshi · entry $0.8693−$0.83
Bernadette Wilson wins AK governorPolymarket ↔ Kalshi · entry $0.2965−$9.94
See the full log →
Five paper positions, opened 28 Jul 2026 and closed 4 Aug. One won. Net is the one-leg figure marked to market, before the second venue's cut. The losers stay on the list because that is the record.
Collected by Trustpilot. Every one that arrives is shown at the rating it was given and quoted in full, including the parts that sting, with a link so you can check it against the source.
4.0 out of 5
1 review
Max dijan1 review · United States“For some reason a few pages wouldn't load but the scanner worked surprisingly perfect I couldn't find an arb scanner that does it quite like prediction edge, Good stuff .”
Read it on Trustpilot
Verify independently at trustpilot.com/review/predictionedge.pro. PredictionEdge does not pay for reviews, does not offer anything in exchange for one, and does not use Trustpilot's invitation tools to select who gets asked.
It locates the same question on Polymarket and Kalshi, prices both taker legs from each published fee schedule, and shows what is left of the spread once the full round trip is paid.
Both venues charge on the way in and again on the way out, and the cost changes with the contract price. Most apparent edges are smaller than that round trip.
No. There is no sign-up, no subscription and no paywall on the scanner.
Polymarket and Kalshi.
It means the two questions look equivalent but their settlement terms are not confirmed identical. Those are listed so you can judge them, not presented as opportunities.
Each coefficient carries the date it was last verified, and that date is shown next to the number rather than kept out of sight.
Not yet. The scan itself is free and will stay free.
No. Prediction markets are not legal everywhere, and nothing on this site is financial advice.
Something not answered here?
info@predictionedge.pro
Free, no account, and every number carries the date it was checked.