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Arbitrage — one fair price, the cheapest place to buy

The exact same event is often listed on both Kalshi and Polymarket. We blend the two books into one fair price — better than either alone — then point you to the cheapest place to buy YES. It's line-shopping: the trick sports bettors use to beat the book, finally for prediction markets. Same event, matched by strict rule — never fuzzy guesses.

1 · Match

Find the identical event on both books — same outcome, same resolution. No pair unless both legs are confirmed.

2 · Fair value

Blend both books into the one price it's really worth — the number you actually want.

3 · Line-shop

Buy YES wherever it's cheapest — ideally below fair value. We show you which book and how much you save.

Matching events across Kalshi & Polymarket…