# FillBook

Startup, Worldwide.

> A trade journal for Kalshi with fee-adjusted P&L
>
> — in its own words, from fillbook.io

- Website: https://fillbook.io
- Listed since: 2026
- launched: 2026-08-20
- launch post: https://news.ycombinator.com/item?id=49373429
- hn score: 3
- domain created: 2026-07-20
- Last verified: 2026-08-20


## Sources

- Hacker News, "Show HN" — https://news.ycombinator.com/item?id=49373429, read 2026-08-20

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startup.is · https://startup.is/registry/fillbook · open data: /api/v1, /llms.txt