PredictionScan

PredictionScan is an app for ChatGPT and other AI assistants that answers questions about prediction markets on real-world events. Ask whether something will happen (an election, a Federal Reserve decision, a recession, a court ruling, a crypto price or an award show) and get the current market-implied probability of each outcome, how it has changed and what is moving it.

Independent. Not affiliated with or endorsed by Polymarket. Market data comes from Polymarket's public APIs. PredictionScan is operated by PM Data Services, Inc.

What you can ask

• Market odds: every outcome of a market or event, ranked by probability, with its status, end date and resolution rules.
• Search: open markets on any topic with their current odds.
• Price history: how the odds moved over a day, a week, a month, three months or all time.
• Biggest moves and trending markets: the largest 24-hour swings and the most-traded markets right now.
• Large trades and market flow: the largest recent trades, and who is buying and selling a market.
• Traders: the leaderboard by profit or volume, and public trader profiles and positions.
• News: recent headlines from major outlets about a market or topic.

Read-only and informational

PredictionScan only reads public data. It cannot place or cancel trades, move funds, connect a wallet or sign in to any account. A price of 74 cents means the market puts the chance at about 74%: these are crowd forecasts, not certainties, not PredictionScan's own predictions and not advice. Trading is risky; 100% loss can occur.

Connect

PredictionScan needs no account or key. In ChatGPT, add the PredictionScan app. In any other MCP client, connect to:

https://mcp.predictionscan.org/mcp (Streamable HTTP, no sign-in)

Market and trader results link to read-only analytics pages on predictionscan.org. These pages show public data, without trading controls or wallet connections.