Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Best Prediction Markets UK Pick polygram.ink |
0% | 100% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open on Best Prediction Markets UK → |
Polymarket polymarket.com |
0% | 100% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Open on Best Prediction Markets UK → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Open on Best Prediction Markets UK → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Open on Best Prediction Markets UK → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Open on Best Prediction Markets UK → |
Live odds for Polymarket-based markets come from the Polygon order book. Non-Polymarket venues show attributes only; clicking any row opens the market on Best Prediction Markets UK.
Active sub-markets
| December 31, 2025 | 0% YES | 100% NO |
| June 30, 2026 | 1% YES | 99% NO |
| December 31, 2026 | 55% YES | 46% NO |
| July 31, 2026 | 2% YES | 98% NO |
| September 30, 2026 | 14% YES | 86% NO |
| August 31, 2026 | 5% YES | 95% NO |
Market context
OpenAI's path to public markets remains uncertain, with the company's ownership structure and strategic direction still in flux following internal governance disputes in late 2024. The San Francisco-based AI research firm has raised capital at substantial valuations—most recently at $157 billion in October 2024—yet has made no formal commitment to an IPO timeline. Current crowd-implied probability of 0% reflects widespread scepticism that the company will execute a public listing within the next two years, despite its scale and revenue trajectory.
Comparable technology exits offer limited precedent for this scenario. Anthropic, another large AI research firm, has similarly resisted IPO pressure whilst raising private capital at high valuations. By contrast, firms like Stripe and SpaceX have delayed public offerings for years despite meeting traditional readiness criteria. The 0% implied probability aligns with the absence of concrete IPO signals—no SEC filings, no underwriter appointments, and no management commentary suggesting imminent public markets entry. Prediction markets and analyst consensus appear aligned on this point, with few institutional observers forecasting a 2025–2026 listing.
Traders monitoring this contract should track several developments: formal statements from OpenAI's board regarding capital strategy, changes in regulatory scrutiny of large AI companies, and any acquisition overtures from major technology firms. The company's recent leadership instability and ongoing negotiations around its non-profit governance structure may constrain IPO readiness. Additionally, broader market conditions for technology IPOs and shifts in OpenAI's revenue model or profitability trajectory could alter calculus. Until substantive signals emerge, the 0% probability likely reflects rational scepticism rather than certainty.
Methodology
Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.
Resolution & payout
Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.
Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.
FAQ
- Is this market available outside the US?
- Best Prediction Markets UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.
- How does resolution work?
- Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.
- What's the difference between YES and NO shares?
- A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.
- What does it cost to trade on Best Prediction Markets UK?
- Zero. Best Prediction Markets UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.
- How fast are USDC deposits?
- Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.
Trade OpenAI IPO by 2026? on Best Prediction Markets UK
Live order book, 0% fees, USDC settlement in seconds.
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