FillBook
Startup in .io
A trade journal for Kalshi with fee-adjusted P&L
- Kind
- Startup
- Country
- Worldwide
- Place
- .io
- Listed since
- 2026
- Website
- https://fillbook.io
- 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" — news.ycombinator.com, read 2026-08-20
