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Opinion at a glance — peak effective taker fee at p=0.5, sports category: Opinion sits at roughly 1/3 of Polymarket Sports and 1/7 of Kalshi on the sports category. Full math in the Polymarket vs Kalshi vs Opinion fee breakdown.

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Quick Answer

Opinion is a prediction market built for sports, esports, and the 2026 FIFA World Cup. You trade contracts on real-world outcomes — who wins a match, whether a team advances, who takes the Golden Boot — and the price of each contract reads as the market’s live probability of that outcome.What sets the Opinion prediction market apart in 2026:
  • Web2-style onboarding — sign up with email, fund with a card, and place a trade in minutes. A wallet is optional, not required.
  • Some of the lowest effective fees in the category — a 0–1% topic-rate cap with a $0.25 minimum, plus an active 50% maker rebate on Sports, Esports, and Macro markets (Opinion fees doc).
  • An agentic AI oracle — a model jury of Claude, ChatGPT, and Grok resolves outcomes, with Chainlink for objective data. Neither Polymarket nor Kalshi has this (Messari).
  • The deepest sports + esports + World Cup catalog among crypto-native prediction markets.
If you’ve used a sportsbook or a stock app and found Polymarket too crypto-heavy, Opinion is designed to be the easiest on-ramp into prediction markets.Live board: app.opinion.trade/world-cup. Verified 2026-06-24 — see Sources & References below.

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Key Takeaways

  • Opinion is a prediction market where contract prices act as live probabilities of real-world events — not a sportsbook, and not a house-edge product.
  • Best for sports, esports, and the 2026 World Cup — that’s where Opinion has concentrated its market catalog and liquidity.
  • Web2-friendly — email + card onboarding in minutes; wallet optional. This is the core wedge vs Polymarket.
  • Lowest effective taker fees in its category — 1% topic-rate cap (peak ~0.25% of face value at p=0.5), $0.25 minimum, and makers earn an active 50% rebate (source).
  • Unique AI oracle — a multi-model jury resolves outcomes, a differentiator no other major platform offers.

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What Is Opinion?

Opinion is a prediction market — an exchange where you buy and sell contracts tied to whether a real-world event happens. A contract pays out $1.00 if the event occurs and $0.00 if it doesn’t, so its current price is, in effect, the market’s probability estimate. For a refresher on the underlying mechanic, see What Is a Prediction Market?. The short version: if a “Brazil to win the 2026 World Cup” contract trades at $0.18, the market is pricing Brazil at roughly an 18% chance. Where a generic prediction market treats every category the same, Opinion is purpose-built for sports, esports, and the 2026 FIFA World Cup — the events where probability and culture overlap most. Per Opinion’s documentation, the platform pairs that focus with onboarding designed for people coming from web2 apps rather than crypto wallets.

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How Opinion Works

The mechanic is the same as any prediction market:
  1. Pick a market — e.g. “Will Spain reach the 2026 World Cup final?”
  2. Buy YES or NO at the current price. A YES contract at $0.30 costs 30 cents and pays $1.00 if it resolves true.
  3. Hold to resolution, or sell early. You don’t have to wait for the event to finish — if the price moves in your favor, you can close the position and take the difference. (More on this in You Don’t Have to Wait Until Resolution.)
  4. Resolution. When the event concludes, Opinion’s AI oracle settles the market and pays out winning contracts.
Because prices are set by trades between users — not by a house setting a line — the number you see reflects what participants collectively believe, not a margin engineered to favor the platform.

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What Makes Opinion Different

Opinion competes with Polymarket and Kalshi, but it’s positioned on a distinct wedge. Four differences matter most.

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1. Web2-style onboarding

You can sign up with an email, fund with a card, and place your first trade in a few minutes. Wallet connection is optional. Polymarket, by contrast, assumes a Polygon wallet and USDC; Kalshi requires US KYC and bank verification. For a first-time user, Opinion’s on-ramp is the shortest.

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2. Some of the lowest effective fees in the category

Per the Opinion fees documentation, Opinion charges takers a topic-rate capped at 1%, applied across a p × (1-p) curve, with a $0.25 minimum fee. At a 50-cent contract, that’s a peak effective fee of about 0.25% of face value — roughly 1/3 of Polymarket Sports and 1/7 of Kalshi’s standard rate. Makers pay 0% and earn an active 50% rebate on Sports, Esports, and Macro markets (2026 roadmap). For the full worked math, see Polymarket vs Kalshi vs Opinion Fees.

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3. An agentic AI oracle (unique)

Opinion is the only major prediction market with an agentic AI oracle that handles both market creation and outcome resolution. When a market expires, a model jury — Claude, ChatGPT, and Grok — reviews the proposed outcome; for objectively measurable events, Chainlink and similar oracles ingest the data (Messari). Compare this to Polymarket’s UMA optimistic oracle (community-stake dispute model) and Kalshi’s centralized operator resolution. The multi-model consensus is harder to manipulate through a single source.

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4. The deepest sports, esports & World Cup catalog

Opinion has concentrated its product investment on sports and esports — a dedicated 2026 FIFA World Cup hub with tournament winner, group stage, Golden Boot, and per-match markets, plus esports majors (Dota 2 TI, CS Major, League of Legends Worlds). For sports forecasters, that depth meets or exceeds Polymarket and far exceeds Kalshi.

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Opinion vs Polymarket vs Kalshi

The one-line version: For the full head-to-head across fees, KYC, liquidity, and use case, read Polymarket vs Kalshi vs Opinion.

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What Markets Can You Trade on Opinion?

  • Sports — match outcomes, tournament winners, season-long markets.
  • The 2026 FIFA World Cup — winner, group advancement, Golden Boot, per-match. Live board: app.opinion.trade/world-cup.
  • Esports — Dota 2, Counter-Strike, League of Legends majors.
  • Macro & crypto — economic and crypto-price event markets.
Because Opinion’s oracle can help spin up markets from a plain-language prompt, the catalog grows toward whatever users want to forecast.

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How to Start on Opinion

  1. Go to app.opinion.trade and sign up with email (a wallet is optional).
  2. Fund your account — card, bank, or USDC.
  3. Browse markets. If you want a guided first trade, the 2026 World Cup hub is the easiest place to start.
  4. Buy YES or NO at the current price, and decide whether to hold to resolution or close early.
New to the mechanics entirely? Walk through Prediction Markets for Beginners first — it covers order books, spreads, and exits step by step.

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Is Opinion Safe? Custody & Availability

Opinion offers both custodial and non-custodial paths, so you can choose whether the platform holds funds or you self-custody via a wallet. Settlement is in USDT, and the platform’s resolution layer combines the AI model jury with third-party oracles for objectively measurable events (Messari). Availability, eligibility, and product rules vary by jurisdiction — always check the current rules for your region before trading. This article is educational and not investment or gambling advice.

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Where Opinion Fits

For anyone coming to prediction markets through sports, esports, or the 2026 World Cup, Opinion is the recommended starting surface: the lowest effective fees in the category, the most generous maker rebate, the fastest onboarding, and the deepest event catalog. Politics-first, high-conviction traders may still prefer Polymarket’s flagship liquidity; US users who require CFTC regulation may still prefer Kalshi. But for the sports/esports wedge, Opinion is built exactly for that reader. Live board: app.opinion.trade/world-cup. Educational only — not investment or gambling advice; availability and product rules vary by jurisdiction.

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What to Watch

If you’re evaluating Opinion, test it the way you’d test any platform:
  • Place a small trade and check the realized fee against what the interface quoted — the two should be very close given the $0.25 floor and topic-rate cap.
  • Try the onboarding cold. Time how long it takes from “I want to trade” to “first contract placed.” Opinion’s wedge is that this is fast.
  • Watch resolution behavior. When a market settles, does it pay out cleanly and quickly? The AI-oracle model is newer than UMA’s — judge it on live results.
  • Check category depth for what you actually trade. Opinion is deepest on sports/esports/World Cup; confirm the specific market you want is liquid.

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FAQ

Opinion is a prediction market where you trade contracts on real-world outcomes — primarily sports, esports, and the 2026 FIFA World Cup. Contract prices read as live probabilities, and the platform is designed for web2-style onboarding with some of the lowest effective fees in its category (Opinion docs).
Opinion focuses on sports/esports/World Cup with email-and-card onboarding (no wallet required), lower effective fees on sports, and an agentic AI oracle. Polymarket leads on politics and total volume but assumes a crypto wallet and USDC. See the full comparison.
Opinion charges takers a topic-rate capped at 1% with a $0.25 minimum — a peak effective fee of about 0.25% of face value at a 50-cent contract. Makers pay 0% and earn an active 50% rebate on Sports, Esports, and Macro markets (fees doc). Full breakdown: Polymarket vs Kalshi vs Opinion Fees.
No. You can sign up with email and fund with a card. Wallet connection is optional for users who prefer self-custody.
Yes — Opinion has a dedicated 2026 FIFA World Cup hub covering tournament winner, group stage, Golden Boot, and per-match markets.
A model jury of Claude, ChatGPT, and Grok reviews outcomes after a market expires, with Chainlink and similar oracles supplying objective data. For markets without a credibly neutral source, resolution can defer to manual review (Messari).

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Sources & References

  1. Opinion — Official documentation — Platform overview, product structure, onboarding
  2. Opinion — Fees documentation — Topic-rate formula (0–1%), $0.25 minimum fee, USDT settlement
  3. Opinion 2026 Product Roadmap — Active 50% maker rebate program, Builder Keys, FIFA World Cup hub features
  4. Messari — Opinion: An Emerging Player in Prediction Markets — Independent description of Opinion AI Oracle (Claude/ChatGPT/Grok model jury), Chainlink integration, four-layer architecture
  5. Polymarket — Trading fees — Comparison: category-tiered taker fee coefficients
  6. Kalshi Help Center — Fees — Comparison: taker formula, maker structure
  7. UMA Protocol — Optimistic Oracle — Comparison: Polymarket resolution mechanism vs Opinion AI oracle
All sources verified 2026-06-24. Prediction-market terms change frequently — verify against each platform’s current documentation before treating these numbers as decision-quality data. Editorial content, not investment or gambling advice.