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Prediction Market Arb Scanner - Find risk-free spreads across Polymarket, Kalshi & PredictIt

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Scans Polymarket, Kalshi, and PredictIt for the same market and flags price gaps where buying YES on one and NO on the other locks in guaranteed profit. Matching is frequency-weighted, not naive overlap, so it will not confuse candidates in the same race.

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Hey Product Hunt 👋 I've been running prediction-market tools on Apify for a while now (a Polymarket scraper and a 2-platform arb finder), and kept noticing PredictIt was the obvious third leg nobody had wired in — it's US-only, no auth required, and often prices things differently than Polymarket or Kalshi. The harder problem turned out to be matching: naive keyword overlap confidently matches the wrong candidate in a multi-way race, or the wrong side of a two-party question, and produces fake "arbitrage" that's really just a bad pairing. Fixed that with frequency-weighted matching so a candidate's actual name counts far more than words every market in that race shares. Would love feedback, especially from anyone already trading across these platforms — tell me where the matching gets it wrong and I'll tighten it up.