Question 1

What is MassPredict?

Accepted Answer

MassPredict is a prediction market aggregator that compares odds and probabilities across 9 platforms — Polymarket, Kalshi, ForecastEx, Limitless, PredictIt, Futuur, Manifold, Metaculus, and SwiPredict. According to our live aggregation system, MassPredict tracks over 40,000 active markets with 79 million+ historical price snapshots, making it one of the most comprehensive cross-platform prediction market comparison tools available. Data is sourced via official platform APIs including the Kalshi Exchange API (https://trading-api.readme.io/reference) and Polymarket's public data feeds (https://docs.polymarket.com/).

Question 2

What prediction market platforms does MassPredict aggregate?

Accepted Answer

MassPredict aggregates data from 9 platforms: Polymarket (decentralized, crypto-based, per Polymarket docs at docs.polymarket.com), Kalshi (CFTC-regulated US exchange, per kalshi.com/regulatory), ForecastEx (CME Group's prediction market exchange), Limitless, PredictIt (political prediction market), Futuur, Manifold (play-money research platform), Metaculus (forecasting platform), and SwiPredict (gamified prediction game). This covers both real-money platforms regulated by the CFTC and play-money platforms used for research and entertainment.

Question 3

How many prediction markets does MassPredict track?

Accepted Answer

As of March 2026, MassPredict tracks over 40,000 active prediction markets across 9 platforms, with more than 79 million historical price data points. The largest contributor is Kalshi with over 15,000 markets, followed by Polymarket with over 3,500 markets and ForecastEx with over 3,300 markets. Markets span politics, economics, sports, crypto, entertainment, science, technology, and weather.

Question 4

How accurate are prediction markets?

Accepted Answer

Research consistently shows prediction markets are among the most accurate forecasting tools available. A landmark study published in Science by Arrow et al. (2008) found that prediction markets outperform polls and expert panels in forecasting elections. Philip Tetlock's research at the University of Pennsylvania, documented in 'Superforecasting' (2015), demonstrated that well-structured prediction markets aggregate collective intelligence effectively. MassPredict enhances accuracy analysis by comparing odds across 9 platforms simultaneously, allowing users to identify consensus forecasts and cross-platform divergences.

Question 5

What is the difference between Polymarket and Kalshi?

Accepted Answer

Polymarket and Kalshi are both leading prediction market platforms but differ in key ways. According to Kalshi's regulatory filings, Kalshi is a CFTC-designated contract market (DCM) operating as a regulated US exchange. Polymarket, as documented on docs.polymarket.com, is a decentralized platform built on the Polygon blockchain using USDC for settlement. Kalshi offers over 15,000 markets with US regulatory compliance, while Polymarket offers over 3,500 markets with higher liquidity on major events. MassPredict lets you compare odds between both platforms side-by-side to find the best prices.

Question 6

Are prediction markets legal in the United States?

Accepted Answer

Yes, certain prediction markets are legal in the United States. The Commodity Futures Trading Commission (CFTC) regulates prediction markets as event contracts under the Commodity Exchange Act. Kalshi operates as a CFTC-designated contract market (DCM), and ForecastEx is operated by CME Group, also under CFTC oversight. PredictIt previously operated under a CFTC no-action letter but has since shut down. The regulatory landscape continues to evolve — in 2024, a federal court ruling upheld Kalshi's right to offer election-related contracts, expanding the scope of legal prediction markets in the US. MassPredict aggregates data from regulated and unregulated platforms, clearly identifying each.

Question 7

What is Raven Aⁱ intelligence?

Accepted Answer

Raven Aⁱ is MassPredict's AI-powered intelligence suite designed for prediction market analysis. It consists of three modules: THE WATCH provides real-time market surveillance with five visualization views (The Eye, The Keep, The River, The Chase, and The Terrain); THE STUDY offers deep research tools including Predictapedia, cross-platform consensus analysis, and historical price comparison; and THE TRADE provides simulation and portfolio analysis tools. Raven Aⁱ uses machine learning to detect cross-platform price divergences, unusual volume patterns, and consensus shifts across all 9 aggregated platforms.

Question 8

How does MassPredict calculate consensus odds?

Accepted Answer

MassPredict calculates consensus odds by aggregating real-time price data from all 9 platforms where a market is listed. The system uses volume-weighted averaging that accounts for each platform's liquidity and trading volume on a given market. When the same event is traded on multiple platforms — for example, a presidential election contract on both Kalshi and Polymarket — MassPredict's matching algorithm identifies equivalent markets and computes a cross-platform consensus probability. This approach follows principles from financial market microstructure theory, as described in research by Wolfers and Zitzewitz (2004) published in the Journal of Economic Perspectives.

Question 9

How often is MassPredict market data updated?

Accepted Answer

MassPredict updates market data continuously through scheduled API polling and webhook integrations with each platform. Most platform data refreshes every 5 to 15 minutes, with high-activity markets updating more frequently. Historical price snapshots are captured at regular intervals, contributing to the 79 million+ price data points in the system. THE WATCH real-time surveillance views in Raven Aⁱ provide the fastest access to market movements across all 9 platforms.

Question 10

Is MassPredict free to use?

Accepted Answer

MassPredict's core features are free, including market aggregation across all 9 platforms, search with the HONE filter system, cross-platform price comparison, and historical price charts. Raven Aⁱ premium unlocks advanced features: THE WATCH real-time surveillance views, THE STUDY deep research and Predictapedia, and THE TRADE simulation tools. Raven Aⁱ premium is available for $9.99 per month or $79.99 per year. No credit card is required for the free tier.

Question 11

How does MassPredict compare to other prediction market aggregators?

Accepted Answer

MassPredict differentiates from other aggregators by tracking 40,000+ markets across 9 platforms with 79 million+ historical price points — one of the largest cross-platform datasets in the prediction market space. Unlike single-platform tools, MassPredict provides cross-platform consensus odds, divergence detection, and unified search. The Raven Aⁱ intelligence suite adds AI-powered analysis including real-time surveillance (THE WATCH), research tools (THE STUDY with Predictapedia), and simulated trading (THE TRADE). Other tools in the space include Polymarket Analytics, Oddpool, and Prediction Hunt, each focusing on different platform subsets.

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