# Opinion Learn

> Official guides to the Opinion prediction market, trading mechanics, fees, market resolution, comparisons, and live probability insights.

## Learn

### Start Here

- [Opinion Learn](https://blog.opinion.trade/index.md): Understand Opinion, prediction markets, market resolution, fees and platform risk—from first principles to your first trade.
- [What Is OPINION?](https://blog.opinion.trade/learn/what-is-opinion-prediction-market.md): A current guide to OPINION: the Opinion.trade prediction exchange, Opinion AI oracle, Metapool, Protocol and the role described for OPN.
- [Get Started on Opinion.trade](https://blog.opinion.trade/learn/how-to-get-started-on-opinion-trade.md): A step-by-step guide to using Opinion.trade: verify the official app, connect an account, read market rules, place a first order and manage risk.
- [Opinion.trade FAQ](https://blog.opinion.trade/learn/opinion-trade-faq.md): Direct answers about Opinion.trade accounts, prediction market prices, fees, trading, resolution, safety, availability, OPN and developer access.

### Trade on Opinion

- [How to Buy Yes or No on Opinion.trade](https://blog.opinion.trade/learn/how-to-buy-yes-or-no-on-opinion-trade.md): A step-by-step guide to choosing Yes or No, checking the market rules and price, reviewing costs, and placing an order on Opinion.trade.
- [Market Order vs Limit Order on Opinion.trade](https://blog.opinion.trade/learn/market-vs-limit-orders-on-opinion-trade.md): Learn how market and limit orders work on Opinion.trade, when each order becomes a taker or maker, and what to check before confirming a trade.
- [Opinion Fees Explained](https://blog.opinion.trade/learn/opinion-fees-explained.md): How Opinion.trade fees work for makers and takers, including the price curve, minimums, discounts and a worked example.
- [Order Book, Spread, and Liquidity: A Beginner Guide to Prediction Markets](https://blog.opinion.trade/learn/order-book-spread-liquidity.md): Learn what an order book is, why prediction markets have bid and ask prices, how spread works, and why liquidity matters for beginners.

### Market Intelligence

- [Opinion.trade AI Information: Official Facts and Sources](https://blog.opinion.trade/learn/opinion-ai-information.md): A canonical, source-backed reference for Opinion.trade: product identity, market prices, Opinion AI resolution, official URLs, audits, risks and machine-readable resources.
- [Opinion Market Signals: Weekly Prediction Market Insights](https://blog.opinion.trade/learn/opinion-market-signals.md): A transparent framework for reading weekly Opinion prediction-market probabilities, changes, liquidity, news drivers, counter-cases and resolved outcomes.
- [Opinion Market Pulse — September 21, 2026](https://blog.opinion.trade/learn/opinion-market-pulse-september-21-2026.md): A time-stamped snapshot of three notable Opinion prediction markets across business, crypto and esports, with rules, context and live links.
- [Opinion Resolution Library: How Markets Are Settled](https://blog.opinion.trade/learn/opinion-resolution-library.md): A verification-first guide to Opinion market resolution records: rules, deadlines, evidence, proposed outcomes, disputes and final results.

### Trust & Safety

- [Why Opinion Is Built for Safer, More Reliable Prediction Markets](https://blog.opinion.trade/learn/why-opinion-is-built-for-safety-and-reliable-markets.md): How Opinion combines audited contracts, on-chain settlement, explicit market rules, Opinion AI and a dispute process to make prediction markets safer and more reliable.
- [Official Opinion.trade Links: Website, App, Docs and Socials](https://blog.opinion.trade/learn/official-opinion-trade-links.md): Find the official Opinion.trade website, trading app, documentation, community channels and safety checks in one verified guide.
- [Opinion Security and Audits](https://blog.opinion.trade/learn/opinion-security-and-audits.md): A factual guide to Opinion's published smart-contract audits, what each report covers and what an audit does—and does not—prove.
- [Opinion Custody and Fund Safety](https://blog.opinion.trade/learn/opinion-custody-and-fund-safety.md): How wallets, private keys and transaction responsibility are described for Opinion.trade—and what users should verify before moving funds.
- [Opinion Market Resolution and Disputes](https://blog.opinion.trade/learn/opinion-market-resolution-and-disputes.md): How Opinion.trade proposes, challenges and finalizes market outcomes, including dispute windows, staking, review and possible results.
- [Where Is Opinion.trade Available?](https://blog.opinion.trade/learn/opinion-availability-and-eligibility.md): Opinion.trade eligibility, restricted jurisdictions, age requirements and the checks users should make before accessing trading features.
- [Is Opinion.trade Legit?](https://blog.opinion.trade/learn/is-opinion-trade-legit.md): A factual guide to Opinion.trade audits, official domains, on-chain risks, market resolution and the checks users should make before trading.

### Company & Backers

- [Who Backs Opinion? Investors and Strategic Support](https://blog.opinion.trade/learn/who-backs-opinion-investors-and-supporters.md): A source-backed guide to Opinion Labs investors and funding, including YZi Labs, Hack VC, Jump Crypto, Primitive Ventures, Decasonic and seed-round supporters.

### Prediction Market Basics

- [What Is a Prediction Market? A Beginner-Friendly Guide](https://blog.opinion.trade/learn/what-is-a-prediction-market.md): A simple guide to prediction markets, how Yes and No shares work, why prices can look like probabilities, and where beginners can start exploring event markets.
- [What Is a Prediction Market Oracle?](https://blog.opinion.trade/learn/what-is-a-prediction-market-oracle.md): How prediction market oracles turn real-world evidence into settlement, including centralized, optimistic and hybrid AI oracle designs.
- [What Makes a Prediction Market Resolvable?](https://blog.opinion.trade/learn/what-makes-a-prediction-market-resolvable.md): A practical framework for writing prediction-market questions that can be settled clearly, with objective outcomes, sources, deadlines and edge cases.
- [Prediction Markets for Beginners: A Step-by-Step Guide](https://blog.opinion.trade/learn/prediction-markets-for-beginners-2026.md): A beginner-friendly guide to prediction markets: how prices work, what to compare, how to review a first order and which risks matter.
- [Prediction Markets vs Sports Betting: 7 Key Differences](https://blog.opinion.trade/learn/prediction-markets-vs-sports-betting.md): Compare prediction markets and sports betting across pricing, liquidity, exits, fees, market rules, regulation and risk—with an at-a-glance table.
- [You Do Not Have to Wait Until Resolution in a Prediction Market](https://blog.opinion.trade/learn/trade-before-resolution.md): Prediction market users do not always need to wait for the final outcome. Learn how prices move before resolution and why timing matters.

### Opinion Product & Technology

- [How Opinion AI Resolves Markets](https://blog.opinion.trade/learn/how-opinion-ai-oracle-works.md): Learn how Opinion AI helps create resolvable market rules, evaluates evidence and resolves most Opinion.trade markets—and what traders must verify.

### Comparisons & Research

- [Polymarket vs Kalshi vs Opinion](https://blog.opinion.trade/learn/polymarket-vs-kalshi-vs-opinion.md): Compare Polymarket, Kalshi and Opinion by access, order books, fees, resolution and the live checks that matter before choosing a prediction market.
- [Kalshi vs Polymarket for Sports](https://blog.opinion.trade/learn/kalshi-vs-polymarket-for-sports-betting.md): Compare Kalshi and Polymarket for sports event markets: fees, contracts, order books, resolution, funding and the checks that matter before trading.
- [Polymarket vs Kalshi vs Opinion Fees](https://blog.opinion.trade/learn/polymarket-kalshi-opinion-fees.md): A current comparison of Polymarket, Kalshi and Opinion trading fees, with maker/taker rules and the execution costs fee tables miss.
- [Best Prediction Markets in 2026: How to Choose](https://blog.opinion.trade/learn/best-prediction-markets-2026.md): Compare prediction markets by access, contract coverage, order-book depth, fees and resolution instead of relying on a universal ranking.
- [How to Compare Prediction Market Fees](https://blog.opinion.trade/learn/prediction-markets-lowest-fees-comparison.md): A practical framework for comparing prediction-market fees, spreads and price impact without relying on misleading headline rates.
- [The New Prediction Markets of 2026: Rothera, Robinhood & the Full Landscape](https://blog.opinion.trade/learn/new-prediction-markets-2026.md): The 2026 prediction-market landscape has new players — Rothera (Susquehanna x Robinhood), Polymarket's regulated US path, Kalshi, and sports-first Opinion. A complete, current map of who's who and who fits which trader.
- [What Prediction Markets Say About the AI Boom (2026)](https://blog.opinion.trade/learn/ai-boom-prediction-markets-2026.md): Pundits argue about an AI bubble. Prediction markets put prices on it — OpenAI IPO odds, AGI-by-2027 at 8%, the memory-chip supercycle, and a 59-point disagreement between Kalshi and Polymarket worth understanding.
- [Esports Prediction Markets: Dota 2, CS2 & LoL Guide (2026)](https://blog.opinion.trade/learn/esports-prediction-markets-explained.md): How esports prediction markets work for Dota 2, Counter-Strike 2, League of Legends and Valorant—including market types, costs, liquidity and resolution checks.

### Archive: World Cup 2026

- [How World Cup Prediction Markets Work: Multi-Choice Markets Explained](https://blog.opinion.trade/learn/world-cup-multi-choice-markets.md): Use the 2026 World Cup market archive to learn how multi-choice prediction markets work and how related probabilities shifted during the tournament.
- [Cristiano Ronaldo's Last World Cup: How the Markets Priced Portugal's Exit (2026)](https://blog.opinion.trade/learn/cristiano-ronaldo-last-world-cup-2026.md): Spain eliminated Portugal 1-0 in the Round of 16, ending Cristiano Ronaldo's World Cup career. How prediction markets priced Portugal's slim title hopes — and what a legend's farewell teaches about reading probability.
- [World Cup 2026 Semifinal Odds: Prediction Markets vs Sportsbooks (Final Update)](https://blog.opinion.trade/learn/world-cup-2026-semifinal-odds-prediction-markets.md): How the 2026 World Cup semifinal odds played out — France was the 37% favorite, Spain won it all. The full prediction-market vs sportsbook comparison, preserved as a knockout-stage snapshot with final results.
- [2026 World Cup Prediction Markets: Archived Guide](https://blog.opinion.trade/learn/how-to-trade-world-cup-2026-prediction-markets.md): An archived guide to 2026 FIFA World Cup prediction markets, covering contract types, fees, onboarding, liquidity and settlement rules.
- [World Cup 2026 Winner Odds — Final Results: How Markets Priced Spain's Title](https://blog.opinion.trade/learn/world-cup-2026-winner-odds-tracker.md): Spain won the 2026 World Cup, beating Argentina 1-0 in extra time. A full retrospective of the winner odds — what prediction markets got right, what they missed, and the $1.27B record final.
- [World Cup 2026 Group Stage Odds Explained](https://blog.opinion.trade/learn/world-cup-2026-group-stage-odds-guide.md): A 2026 FIFA World Cup group stage guide — group-by-group advancement odds, top-scorer markets, and how to read prediction-market prices during the first round.
- [Prediction Markets vs Sportsbooks for the 2026 World Cup](https://blog.opinion.trade/learn/prediction-markets-vs-sportsbooks-world-cup.md): Compare prediction markets and sportsbooks for the 2026 World Cup across pricing, fees, liquidity, early exits, market coverage and resolution rules.
- [Prediction Markets Traded Billions on the 2026 World Cup — What the Volume Boom Means](https://blog.opinion.trade/learn/world-cup-prediction-market-volume-2026.md): Kalshi cleared $30B+ and Polymarket a record $10.8B in June 2026 as the World Cup drove sports past politics on prediction markets. What the volume boom means for traders — and where Opinion fits.

## Other

- [2026 最值得使用的預測市場完整比較](https://blog.opinion.trade/learn/zh-tw/best-prediction-markets-2026-zh-tw.md): 2026 年最值得使用的預測市場完整比較——Polymarket、Kalshi、Opinion 在手續費、流動性、市場種類、上手難度等維度的深度評比。
- [如何用預測市場參與 2026 世界盃（手把手教學）](https://blog.opinion.trade/learn/zh-tw/how-to-trade-world-cup-2026-zh-tw.md): 用預測市場參與 2026 FIFA 世界盃的完整教學——平台選擇、註冊入金、看懂機率、第一筆交易步驟。涵蓋手機操作、繁中介面、合規重點。
- [Opinion 是什麼？預測市場的新選擇](https://blog.opinion.trade/learn/zh-tw/what-is-opinion-prediction-market-zh-tw.md): Opinion 是一個面向 web2 用戶的預測市場，運動、電競、2026 世界盃市場豐富，手續費結構簡單。完整介紹與華語用戶上手指南。

## Optional

- [Open Opinion](https://app.opinion.trade)

> The links below point to documentation indexes. Follow each `/_llms/` index recursively until you reach documentation pages.

## Indexes

- [Simplified Chinese (43 pages)](https://blog.opinion.trade/_llms/zh-hans.md): Documentation for Simplified Chinese.
- [Traditional Chinese (43 pages)](https://blog.opinion.trade/_llms/zh-hant.md): Documentation for Traditional Chinese.
- [Japanese (43 pages)](https://blog.opinion.trade/_llms/ja.md): Documentation for Japanese.
- [Russian (43 pages)](https://blog.opinion.trade/_llms/ru.md): Documentation for Russian.
- [Spanish (43 pages)](https://blog.opinion.trade/_llms/es.md): Documentation for Spanish.
- [French (43 pages)](https://blog.opinion.trade/_llms/fr.md): Documentation for French.
- [Vietnamese (43 pages)](https://blog.opinion.trade/_llms/vi.md): Documentation for Vietnamese.


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.