Mostly Right Information

Mostly Right is building the data layer for prediction markets: the one place to get the fundamental data that moves prices, for both human traders and AI agents. Prediction markets have gone mainstream, but the data that settles them is scattered across raw, mismatched sources you stitch together by hand while you trade. We put it all in one place and one schema, so a trader and a trading agent read exactly the same thing. Our first product is a free Chrome plugin that puts that data right on the Kalshi and Polymarket market page. It starts with weather: open a temperature market and you see the live observation, the history, and forecasts from 36 models, without leaving the page. Underneath it is an open-source SDK in Python and TypeScript, built so a backtest can never train on data that did not exist yet. Weather is only the first market. We are expanding to the financial and economic markets next, with the equities, economic data, and filings that move them, and from there to every market with public data behind it. We are a small team that trades these markets ourselves and builds the tools we wished existed.