PredictMirror | Polymarket Paper Trading

The free Polymarket paper trading simulator that runs right in your browser.

PredictMirror is a Chrome extension that lets you practice on any Polymarket market with $1,000 in virtual capital. Live order book prices, accurate fees per category, and full depth slippage calculation. The simulated numbers match what you'd pay on the real platform down to the cent.

No wallet connection. No account required. All data stored locally in your browser.

For anyone who's ever wondered whether you can paper trade on Polymarket, this is how. Build intuition before you risk real capital, test a thesis without exposure, or just keep an honest record of how your calls perform over time.

Available free on the Chrome Web Store.

→ Search “predictmirror” on the Chrome Web Store