Fee-Adjusted Edge Calculator

Overview

Calculates the real-world profitability of a trade by subtracting platform fees, spreads, and other costs from your theoretical edge. This ensures you only take positions that are profitable in practice, not just on paper.

What It Does

This pillar models the total transaction cost of entering and exiting a position. It ingests platform-specific fee structures and the current bid-ask spread for a given market. It then applies these costs to your estimated edge to reveal the Net Expected Value, turning a theoretical guess into a practical P&L forecast.

Why It Matters

A small perceived edge can easily be erased by transaction costs, leading to consistent small losses over time. This pillar provides the discipline to avoid superficially attractive but ultimately unprofitable trades, preserving your capital for high-value opportunities.

How It Works

First, the user inputs their private probability assessment and the current market price. The tool then fetches the platform's trading fee percentage and the live bid-ask spread. Finally, it calculates the gross edge and subtracts the total costs to present a clear 'Net Edge' percentage.

Methodology

Net Edge % = [(YourProbability * (1 - AskPrice)) - ((1 - YourProbability) * AskPrice)] - (PlatformFee% + SpreadCost%). SpreadCost% is calculated as (AskPrice - BidPrice) / 2, representing the cost of a round trip. PlatformFee% is the fee applied by the market operator on winnings.

Edge & Advantage

It systematically prevents you from making trades where transaction costs exceed your analytical edge, a common mistake that erodes profitability.

Key Indicators

• Net Edge %

  high

  The final expected value of a position after all costs are deducted.

• Platform Fee %

  high

  The percentage fee charged by the market on winning shares or volume.

• Bid-Ask Spread Cost

  medium

  The implicit cost paid to cross the spread for immediate trade execution.

Data Sources

• Prediction Market Platforms

  Provides official fee schedules, maker/taker models, and real-time bid-ask spreads.

• User Input

  The trader's private probability assessment for the market outcome.

Example Questions This Pillar Answers

• → Is my 2% edge on this market still profitable after a 1% fee and a wide spread?
• → How much does the price need to move for me to break even on this trade, including all costs?
• → Which platform offers the best net return for this specific trade considering their different fee structures?

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