Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via BTC Prediction) Pick polygram.ink (preferred broker) |
37% | 63% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open live market → |
Polymarket (direct) polymarket.com |
37% | 63% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Open live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Open live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Open live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Open live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| August 10 | 37% |
| No release by August 31 | 13% |
| August 12 | 12% |
| August 24 | 6% |
| August 25 | 5% |
| August 27 | 4% |
| August 18 | 3% |
| August 6 | 2% |
| August 7 | 2% |
| August 8 | 2% |
| August 11 | 2% |
| August 16 | 2% |
| August 26 | 2% |
| August 28 | 2% |
| August 9 | 1% |
| August 13 | 1% |
| August 14 | 1% |
| August 17 | 1% |
| August 19 | 1% |
| August 20 | 1% |
| August 21 | 1% |
| August 29 | 1% |
| August 31 | 1% |
| On or prior to August 1 | 0% |
| August 2 | 0% |
| August 3 | 0% |
| August 4 | 0% |
| August 5 | 0% |
| August 15 | 0% |
| August 22 | 0% |
| August 23 | 0% |
| August 30 | 0% |
Market context
Google’s next qualifying Gemini Pro launch will be counted only when the model is publicly available, not merely announced or previewed, so the key event is a broad release of a new **Pro**-branded build through Gemini app, API, Vertex AI or related Google surfaces. Google’s own lifecycle pages show recent Pro-family releases still sitting in preview while lightweight variants have moved faster, which matters because the market excludes Flash and Flash-Lite even if they arrive first.[1][8][9]
The current **0%** implied probability sits against a recent pattern of repeated slippage around Gemini Pro timing. Google signposted Gemini 3.1 Pro in February 2026 with preview access across developer and consumer channels,[8][9] while later reporting said Gemini 3.5 Pro had been pushed out from an initial June target, with Reuters noting on 21 July that Google had released cheaper Gemini variants but gave no timing update for the flagship Pro model beyond saying it was being tested with partners and would be coming “soon”.[13][15] That makes the market’s path to settlement unusually binary: a public GA or open rollout before 31 August would resolve it, while another slip leaves YES looking underpriced only if traders believe Google is ready to ship quickly.[1][13]
For traders, the main catalysts are Google product posts, developer changelogs and model-version tables, because those are where a qualifying Pro launch is most likely to appear first. A scheduled keynote, a surprise blog drop, or a release-note update that moves a Pro-labelled preview into general availability would be decisive; by contrast, any announcement focused on Flash, Flash-Lite, image, or “preview” wording alone would not settle the market.[1][2][4][8] In crypto terms, the contract is an event trade rather than a macro hedge, but the current 0% price leaves room for abrupt repricing if a launch lands during a broader risk-on tape in BTC and ETH and traders rotate into higher-beta event exposure.
Methodology
Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.
Resolution & payout
Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.
Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.
UK Frequently Asked Questions
- Why USDC and not ETH or USDT?
- USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.
- What does a transaction cost on Polygon?
- Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.
- Is Polymarket legal in the UK?
- Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.
- Do I pay tax on prediction market profits in the UK?
- UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.
- How do I deposit on Polymarket from the UK?
- UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.
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