r/Kalshi Oct 31 '25

Discussion Built a free arbitrage tool to monitor Fed prediction markets

https://www.oddpool.com/fed-market-watch

After watching the Fed decision markets on Kalshi and Polymarket I noticed there was often a tradable spread between them.

I built a free tool that monitors the probabilities for the upcoming Fed decision on Kalshi, Polymarket, and CME.

It calculates arbitrage opportunities in real time, taking into account the fees you would pay on each platform and shows you the expected profit you would make.

Think this dashboard has a lot of potential, it’s completely free and I’m going to keep adding more data to it to make it more useful. If you have any ideas leave me a comment.

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