How should I use this result?

Treat it as a fast decision aid. For execution-sensitive trades, check live bid, ask, fees, and slippage before acting.

Does this assume Polymarket-style binary settlement?

Unless a tool says otherwise, outputs assume binary shares settle to either $1 or $0 at resolution.

Fees & ArbitrageFree utility

Check a buy-YES / buy-NO complement trade across two venues.

cross platform arbitragekalshi polymarketarb roi

Adjust live

Calculator setup

Enter your assumptions and this tool will update immediately.

Platform A YES price

Platform B NO price

Combined fees

Instant

Primary output

4.17%

Guaranteed ROI

Live resultReady to copy

Notes

Only valid if the two contracts truly settle as complements.

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