Most Kalshi traders can tell you their best trade off the top of their head. Almost none can tell you their real win rate by category with fees folded in.
FillBook fixes that. Paste a read-only Kalshi API key and it pulls in your fills, groups them into positions, and shows you what actually makes you money:
Real P&L with fees folded in, correct settlement to $1/$0
- Win rate and average win/loss by category (politics, sports, econ, weather, crypto)
- Edge decay: P&L by holding duration
- A real journal: notes and tags on every position
- CSV import too. Read-only from day one, so it can never place orders.
Free plan: unlimited trade storage + 60-day analytics window. Pro ($15/mo): full-history analytics.
Built in public by a solo maker. Feedback very welcome.
