Thumper by MagicMarkets by MagicMarkets

Thumper is a side-panel companion for prediction-market traders. Open a market and Thumper instantly shows the same event's price across venues - so you always know where it's cheaper before you trade.

• Live price comparison, side by side, updated as you browse
• Cheaper-venue verdict — which side is the better deal, and by how much
• Edge & arbitrage detection when prices disagree enough to matter
• Order-book depth & price impact before your order moves the market
• Payout calculator — enter an amount, see your return on each venue
• Hedge & position sizing without leaving the page
• Optional desktop alerts when a significant edge appears (off by default)

WORKS ON
• polymarket.com
• pro.magicmarkets.com
More venues coming.

Collects no personal data — your settings stay in your browser. Thumper is an independent tool.