MarketMaster
Find real Kalshi vs Polymarket edges, after fees
2 followers
Find real Kalshi vs Polymarket edges, after fees
2 followers
MarketMaster matches the same event across Kalshi and Polymarket, checks both venues' settlement rules, and ranks price gaps after fees, so you only see edges you could actually take. Free scanner, alerts, a trade journal, and a free API + MCP server.
Free Options
Launch Team / Built With
Render Sandboxes: a computer for every agentIsolated compute, persistent state and a real filesystem
Promoted
Hi Product Hunt! We built MarketMaster because we kept seeing "arbitrage" between Kalshi and Polymarket that disappeared the moment we did the math.
Two things kill most of those gaps: fees, and contracts that look identical but resolve on different dates or sources. MarketMaster matches the same event across both venues, shows every gap before and after fees, and flags pairs that don't settle together, so a spread between two different bets never passes for an edge.
The scanner is free. Pro adds real-time alerts, and there's a free API plus an MCP server if you want the data in Claude or Cursor. We'd love to hear what you'd want it to watch for.