PolyHeat — Polymarket Heatmap

You are scrolling Polymarket again. Hundreds of markets open across fifteen tabs. Still no idea where the real action is. Every prediction market trader knows this feeling. The interesting markets are buried three screens deep. By the time you finally click into the one that moved, the move is already priced in and someone else took the edge. That part is fixable. WHY READING POLYMARKET IS HARD Prediction markets are information-dense by design. A single event page shows you a question, a probability chart, an order book, and a list of sub-outcomes. Useful at the individual level. Useless when you need to know what is happening across the whole platform. - You cannot see volume distribution across 50 markets simultaneously - You cannot tell which YES prices moved in the last few minutes - You cannot compare activity between a 50 million dollar market and a 500 thousand dollar market at a glance - The default Trending list is sorted but not visualized, so everything looks the same weight Most people either stick to the five markets they already follow or miss opportunities entirely. Both are losing strategies in a market where attention is the edge. PolyHeat is built for the second problem. WHAT POLYHEAT DOES PolyHeat is a stock-market style treemap heatmap for Polymarket. The top active markets are laid out as rectangles. Bigger rectangle means more dollar volume. Color shows you whether the crowd is pricing the market as a likely YES or a likely NO. One glance tells you where the money is flowing and which direction sentiment is pushing. No dashboards. No spreadsheets. No API keys. No account. Open the side panel, look at the grid, click any rectangle to jump straight to that market on polymarket.com. Here is what you get: 24H VOLUME VIEW — The default layout. Top 50 markets ranked by dollar volume over the last 24 hours. Politics, crypto, sports, culture, policy — everything that is actually moving, in one screen. 7D VOLUME VIEW — Same treemap, weighted by 7-day volume instead. This is how you tell a one-day flash event from a sustained build-up. 30D VOLUME VIEW — Weighted by 30-day volume. Shows you the structurally important markets of the month, not just the noisy ones. GAINERS — Markets where the YES price ticked up since the last snapshot. Sorted by biggest move. Useful for catching momentum before mainstream headlines pick it up. LOSERS — Same logic in reverse. Markets where the YES price dropped the most since the last snapshot. Useful for spotting overreactions and fade setups. COLOR INTENSITY YOU CAN READ AT A GLANCE — Green rectangles mean high YES probability. Red means low. Gray means contested 30 to 70 range. Darker shade means stronger conviction. No legend needed after five minutes of use. HOVER TOOLTIP WITH EVERYTHING — Put your cursor on any rectangle and you see the 24h volume, 7d volume, liquidity, current YES price, price change since the last snapshot, and number of sub-markets in the event. Zero extra clicks. CLICK TO OPEN — Click any rectangle and the event opens in a new tab on polymarket.com. Two clicks from "something is moving" to "I am on the order book." SIDE PANEL OR FULL PAGE — The side panel stays pinned while you browse anything else. One button expands it to a full-page view when you want the big picture or a clean screenshot. AUTO-REFRESH EVERY 60 SECONDS — You do not have to do anything. The grid stays current while you work. HOW IT WORKS 1. Install the extension. The icon shows up in your toolbar. 2. Click the icon. The PolyHeat side panel opens on the right side of your browser. 3. The grid loads in under 2 seconds — top 18 markets by 24h volume. 4. Click any tab at the top to switch between 24h, 7d, Gainers, or Losers. 5. Click any rectangle to open that market on polymarket.com. 6. Click the expand arrow in the top-right of the side panel if you want the full-page view with 50 markets and three volume timeframes. That is it. No signup. No API key. No settings to configure. WHY A SIDE PANEL AND NOT A POPUP Popups close the second you click anywhere else. That makes them useless for monitoring. You cannot watch a market heatmap if looking at Twitter kills the heatmap. The side panel stays pinned to your browser window regardless of which tab you are on. Scroll X in the main area, glance at PolyHeat on the side, click through when something catches your eye. It is built for ambient awareness, not one-off lookups. The full-page view exists for a different job — deep analysis and screenshot-ready visuals. Same data, bigger canvas, cleaner framing. HOW GAINERS AND LOSERS ARE COMPUTED Polymarket does not expose a public "price change" field. PolyHeat builds it locally. Every 2 minutes the extension fetches current prices for the top 100 active markets and stores them in your browser local storage. On the next fetch, it compares the new prices against the stored ones and calculates the delta. Markets with a positive delta show up under Gainers. Negative deltas show up under Losers. The size of each rectangle still reflects 24h volume, so you see momentum weighted by liquidity. A 5-point move in a 10 million dollar market matters more than a 15-point move in a 20 thousand dollar ghost market. The treemap makes that obvious without you having to think about it. The snapshot lives only in your browser. Nothing leaves your machine beyond the single read from Polymarket's own public API. REAL SCENARIOS WHERE THIS HELPS Morning routine: You open your browser at 8 AM. Click PolyHeat. In three seconds you know which three markets moved overnight while you were asleep. No need to scroll the Polymarket trending page or dig through Discord channels. Event-driven trading: A headline drops about a Fed rate decision. You want to see every Polymarket contract related to rates. Open the Gainers tab — the contracts that actually moved in the last few minutes are sorted to the top and sized by liquidity. You find the most tradeabl…