Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Is Polymarket Legal in Canada) Pick polygram.ink (preferred broker) |
85% | 15% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open the market → |
Polymarket (direct) polymarket.com |
85% | 15% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Open the market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Open the market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Open the market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Open the market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 27°C | 85% |
| 28°C | 9% |
| 29°C | 7% |
| 30°C | 1% |
| 23°C or below | 0% |
| 24°C | 0% |
| 25°C | 0% |
| 26°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C or higher | 0% |
Market context
Chengdu will experience peak summer heat on 17 August 2026, with the highest temperature recorded at Shuangliu International Airport Station determining the settlement outcome. The market resolves to a specific temperature range in degrees Celsius, using Weather Underground's Daily Observations table as the authoritative source rather than summary figures, a distinction that matters when station sensors record micro-variations throughout the day.
Chengdu's August climate is remarkably consistent year-on-year, with historical highs clustering between 33–37 °C during the mid-summer period. The 0% crowd probability reflects either extreme confidence in a specific range or sparse trading activity; comparable Chinese city temperature markets show that late-summer peaks rarely deviate more than 2–3 degrees from the 30-year mean. Traders should examine prior August 17 records from the Shuangliu station specifically, as microclimatic factors around the airport (proximity to water bodies, urban heat island effects) can shift outcomes relative to city-centre readings.
From a regulatory standpoint, this market operates under different compliance frameworks depending on trader jurisdiction. German traders face GlüStV restrictions on prediction market participation; US traders fall under CFTC oversight, which generally permits weather derivatives but scrutinises cash-settled contracts. The "no-KYC up to $1,500" accessibility threshold means traders can enter positions below that stake without identity verification on qualifying platforms, though this market's specific settlement value and range structure will determine whether individual positions breach that limit. Traders should confirm their platform's KYC policy and local weather-derivative regulations before committing capital.
Methodology
This overview of Highest temperature in Chengdu on August 17? reviews the four comparable platforms from a regulatory perspective: which is accessible in your jurisdiction, where KYC kicks in, how the platform is classified by your country of residence. Live probability is the Polymarket mid; comparison columns show regulatory status, KYC thresholds and settlement options for each platform.
Resolution & payout
On Polymarket, resolution runs on-chain via UMA Optimistic Oracle. USDC payout is instant and automatic, with no KYC. Tax treatment depends on your jurisdiction — in the US, gains are usually ordinary income; in the UK, often capital gains. Consult a tax professional for your situation.
FAQ
- How are winnings taxed?
- Tax treatment varies by jurisdiction. In most countries, prediction market gains are treated as ordinary income or capital gains. We cannot provide tax advice — consult a tax professional for your specific situation.
- What happens during a tax audit?
- You're responsible for documenting your trades. Is Polymarket Legal in Canada exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.
- Are prediction markets gambling?
- Legally unclear in most jurisdictions. Some interpretations classify them as wagering (gambling regulation applies), others as derivatives (financial regulation applies). There's no global precedent specifically for on-chain prediction markets.
- Is there a withdrawal cap?
- No platform-side cap. You can withdraw any amount provided KYC is complete. SEPA bank withdrawals over €15,000 trigger additional anti-money-laundering checks (statutory obligation for all platforms).
- What if regulation changes?
- If regulation changes in your jurisdiction (e.g. prediction markets are banned), Is Polymarket Legal in Canada would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.
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