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Brier Trading Group
A prop firm for prediction markets that I founded.
Traders prove themselves on a simulated $50,000 account. I built the platform: the engine that fills simulated orders against live order books, the rules and payout math, the trader app and the owner console.
- TypeScript
- Next.js
- PostgreSQL
- Supabase
- Year
- 2026
- Role
- Founder
- Status
- Waitlist open
- Year
- 2026
- Role
- Founder
- Status
- Waitlist open
- Players trading at once in a load test
- 450
- Live markets priced off public order books
- 1,000
01
Fills from live order books
A simulated order fills against Polymarket's live public order books. It walks the book level by level and never takes more than the size shown, and every fill pays Kalshi's published taker fee, the fee a US trader would pay. The aim is fills no better than a real trade would get.
02
The wallet check
A free page replays any public Polymarket wallet's closed positions against the evaluation's rules and says whether it would have passed. It needs no sign-in and reads only public data.
03
Load test
Before the first league season, I ran a simulated league against the production engine. About 450 players placing three orders a minute each kept its 2-vCPU server under its CPU baseline. Memory and the database were never the limit.
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