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MarketMaster
Find real Kalshi vs Polymarket edges, after fees
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.
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.
About MarketMaster on Product Hunt
“Find real Kalshi vs Polymarket edges, after fees”
MarketMaster was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #94 on the daily leaderboard. 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.
On the analytics side, MarketMaster competes within Fintech, Developer Tools and Artificial Intelligence — topics that collectively have 1M followers on Product Hunt. The dashboard above tracks how MarketMaster performed against the three products that launched closest to it on the same day.
Who hunted MarketMaster?
MarketMaster was hunted by MarketMaster. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of MarketMaster including community comment highlights and product details, visit the product overview.
MarketMaster
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.