Spot the mispriced market before it corrects.
MarketMaster scans thousands of prediction markets in real time, flags positive expected-value edges and cross-platform arbitrage, and alerts you the moment they appear — so you act on an edge instead of hunting for one.
Transparent product metrics — not trading returns. MarketMaster surfaces information; it does not promise profit.
An institutional toolkit for retail traders.
Everything you need to find, validate, and act on an edge — in one fast, unified terminal.
Opportunity scanner
Continuously ranks every tracked market by expected value, so the best opportunities surface to the top automatically.
Expected-value engine
Each market gets a model-derived fair value and an EV edge — so you see why something's mispriced, not just that it moved.
Cross-platform arbitrage
Detects the same event priced differently across Kalshi, Polymarket and Manifold and flags the spread.
Smart alerts PRO
Watchlist a market and get an email the instant price or edge crosses your threshold. No staring at screens.
Chrome extension
See MarketMaster's fair value and edge as an overlay directly on Kalshi and Polymarket market pages.
Journal & analytics PRO
Auto-imports your real trades, tracks realized P&L, win rate and a skill-based rating. Know if your edge is real.
From zero to your first edge in three steps.
Sign up free & browse
Open the scanner instantly. Optionally link a read-only Kalshi key to track your own trades.
Spot the edge
The scanner ranks markets by EV and flags arbs. Every edge shows price, modeled fair value, and the gap.
Act & track
Trade on the platform you already use; MarketMaster records the result and grades your performance over time.
Your edge, on every market page.
Trade where you already are. The overlay puts fair value and EV right on the market ticket.
Start free. Upgrade when the edge pays for itself.
Use the scanner and analyzer free, forever. Pro unlocks alerts, the arbitrage feed, journal analytics, and the extension overlay.
- ✓ Full scanner — browse all edges
- ✓ Single-market analyzer
- ✓ 3 watchlist alerts
- ✓ Everything in Free
- ✓ Unlimited smart alerts
- ✓ Cross-platform arbitrage feed
- ✓ Trade journal, P&L & analytics
- ✓ Chrome extension overlay
- ✓ Everything in Pro
- ✓ Two months free
- ✓ Locked annual rate
Questions, answered.
Does MarketMaster guarantee I'll make money?+
No — and be skeptical of anything that does. MarketMaster is an information and analytics tool. It surfaces where markets may be mispriced and tracks your results honestly; it does not provide financial advice or guarantee returns. Prediction markets carry real risk of loss.
What do "expected value" and "fair value" mean?+
Fair value is our model's estimate of a market's true probability. Expected-value edge is the gap between that and the current price — a structured way to see which markets look mispriced.
Do you need my exchange password?+
Never. The journal uses a read-only Kalshi API key or your public Polymarket wallet address. We can't trade or move funds.
Is the free plan really free?+
Yes — free forever, with full scanner access and the analyzer. Pro adds alerts, the arbitrage feed, journal analytics, and the extension overlay.
Stop scrolling markets. Start finding edges.
Join free in 30 seconds. Bring your edge to every prediction market you trade.
Get started — free