EffectiveSpread.com is a dedicated educational resource for prediction market participants. Our mission is to bring transparency to transaction costs in both Order Book and AMM-based markets.

While quoted spreads are easy to see, they rarely reflect the true cost of entering a position size of any significance. Our calculator and guides are designed to help you quantify your edge and execution costs with mathematical precision.

This project is open-source friendly and designed to support the growing ecosystem of forecasting platforms.