PredictionBubbles aggregates tradable questions from Polymarket and Kalshi into a single bubble map for prediction markets (venues where outcome contracts trade), showing probability, price movement and volume while letting users size markets by open interest (outstanding positions), 24-hour volume or an activity ratio and filter by category, platform, expiry, probability and open interest. The layout resembles stock and crypto heat maps and comes as distribution infrastructure expands: ProCap Financial said in April that Kalshi Research would feed real-time prediction-market figures into ProCap Insights under what the companies described narrowly as Kalshi's first supply agreement with a financial research provider serving paying subscribers, while Polymarket publishes market-discovery and analytics APIs, order-book (bid and ask listings) and pricing data, near-real-time WebSocket feeds (live data streams) and a builder program for third-party applications. Kalshi has also pushed toward professional users, saying in May that institutional trading volume increased 800% in six months and releasing Kalshi Pro in beta in July for people managing many markets and resting orders; in February it also announced a surveillance advisory committee and a technology partnership with Solidus Labs, though the effectiveness of that setup has not been independently established. The product also underscores that a contract priced at 63% reflects a specific contract, trading window and settlement method rather than an unconditional forecast. Unreviewed papers in June and July found that roughly 23 million Kalshi NBA, MLB and NHL moneyline trades were most calibrated in the middle of contracts and weakened in the final 10 minutes; 12,639 filtered parlay trades collected over 15 days were priced at or slightly below parity for two- to four-leg combinations but became more clearly overpriced in higher-leg combinations; and Polymarket five-minute Bitcoin contracts showed a spike in Binance spot flow in the final 10 seconds and a reversal after the close around Chainlink (blockchain oracle network)-settled reference pricing, reinforcing that competition is shifting from listing questions to organizing, distributing and interpreting prices.