Attena

Attena is a search engine for prediction markets, indexing over 80,000 active contracts from Kalshi and Polymarket. Users can ask questions in plain English about sports, crypto, weather, politics, and other topics to find relevant markets and real-time probability estimates. The platform unifies fragmented market data by cleaning and classifying contracts across both platforms, handling structural differences like varying naming conventions and contract groupings.

The makers built Attena using Claude to wrap database queries, allowing natural language questions to return structured market results. A data pipeline processes new markets within minutes, using both rule-based parsing and LLM classification to handle free-form titles and descriptions. The service is designed for traders and AI agents seeking quick access to prediction market information.