Highest temperature in Tokyo on August 4?

Platform comparison

Market context

The relevant real-world event is the highest temperature recorded at Tokyo Haneda Airport on 4 August, measured in Celsius and used to place the outcome into a fixed bracket. Early market pricing at 0% YES is not a statement that the day will be cool; it mainly means the current listed “YES” side is not the dominant outcome, so traders should compare that with the actual bracket structure and the eventual Wunderground reading at Haneda rather than the citywide headline temperature.[1][3]

For context, Tokyo in August is usually hot, with normal highs around 30–31°C, and Haneda often runs slightly cooler than inland Tokyo locations because of its coastal position.[2][9][13] Recent resolved and live Tokyo temperature markets show that single-day outcomes can still land in the high-20s or mid-30s, so a low crowd figure can simply reflect uncertainty around whether the day peaks just below or above a specific threshold rather than a broad view on the weather itself.[3][17] Reuters reported in 2025 that Japan had already been experiencing record-breaking heat, underlining how quickly late-summer temperatures can overshoot seasonal norms.[19]

From a market-access perspective, German GlüStV rules matter because prediction markets can be treated differently depending on whether they are classified as gambling-style products or regulated financial instruments, which affects availability and advertising exposure in Germany. US CFTC reach is also relevant: if a platform or transaction is deemed to fall under US derivatives jurisdiction, compliance and access can change materially for US persons. In practical terms, “no-KYC up to $1,500” usually means a trader can use the market with limited identity checks until cumulative activity crosses that threshold, after which full verification is typically required; for this market, that lowers friction for small positions but does not remove geo, sanctions, or venue-specific restrictions.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This overview of Highest temperature in Tokyo on August 4? 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

Is Polymarket legal in my country?

Polymarket is geo-blocked in the US/UK/EU. Actual usage via the Polymarket interface is not possible there. The legal status itself varies — many countries treat prediction markets as a gray area. Polymarket Tax UK has a different geo footprint.

What happens during a tax audit?

You're responsible for documenting your trades. Polymarket Tax UK 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), Polymarket Tax UK would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.