> ## Documentation Index > Fetch the complete documentation index at: https://blog.opinion.trade/llms.txt > Use this file to discover all available pages before exploring further. # Opinion Prediction Market — Guides, Fees & How to Trade > Learn how the Opinion prediction market works — how its fees compare to Polymarket and Kalshi, how to trade sports, esports, and the 2026 World Cup, plus step-by-step guides for beginners. **Opinion is a prediction market for sports, esports, and the 2026 World Cup** — where you trade contracts on real-world outcomes at some of the lowest effective fees in the category, with an agentic AI oracle and web2-style onboarding. This learn hub explains how prediction markets work, how the **Opinion prediction market compares to Polymarket and Kalshi**, and how to place your first trade. *Every event has a price. Every price has a story. This is where the curiosity becomes clarity.* Whether you're new to prediction markets or already trading them, this is your starting point. Read in any order — every article is short, has one diagram, and ends with a FAQ. ## What you'll get here What a prediction market actually is, why prices read like probabilities, and the difference between trading a market and taking sportsbook odds. Side-by-side breakdowns of Polymarket, Kalshi, and Opinion — fees, regulation, market depth, and which fits your use case. Tournament winner, group stage, top scorer — and how to read live probabilities before, during, and after kickoff. ## New here? If you've never touched a prediction market before, this is the gentlest path: A 2026 step-by-step guide. We'll explain what to expect on your first trade — order books, spreads, exits, resolution — and what makes a market easier or harder for newcomers. ## Already trading on Polymarket or Kalshi? Jump straight to where Opinion fits in the category: The agentic AI oracle, the lowest sports-category fees, and where each of the three platforms wins. Real formulas from each platform's official docs, with worked examples at $50, $500, and \$5,000 trade sizes. *** ## Why this exists Prediction markets are a new way to read uncertainty. Instead of asking *"what do people say will happen?"*, they ask *"what price are people willing to trade at?"* — and the answer is a live probability that updates as new information arrives. This site is a small library for understanding that probability layer. It's especially focused on **sports, esports, and the 2026 World Cup** — the events where probability and culture overlap most naturally. Read what's useful. Skip what isn't. Come back as new articles ship. ## Join the community Daily market commentary, probability shifts, and news. Live discussions, trader chat, and product updates. Short explainers and walkthroughs of how markets work. Long-form roadmap and narrative pieces.