FillBook

Trade journal for Kalshi traders showing real P&L and win rate

WebfreemiumUS

FillBook is a web app trade journal for active Kalshi prediction-market traders. It imports fills via a read-only API key, groups them into positions, and calculates real P&L with fees included, plus win rate by category and edge decay by holding duration. The app is read-only (cannot place orders) and aimed at traders who need accurate, fee-aware performance tracking.

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