Will Super Typhoon Dolphin hit Japan?

Platform comparison

Market context

Super Typhoon Dolphin is already being tracked on a path that brings it close to Japan’s southern island chain, so the market is really about whether the centre crosses Japanese land rather than whether the storm threatens the region. JMA-linked coverage and other weather reporting have repeatedly placed the system near Okinawa and the Ryukyu Islands, with some runs pointing towards a direct Okinawa landfall and others keeping the core offshore or shifting it towards the East China Sea[2][9][13]. For a venue comparison, Polymarket-style markets usually quote a single crowd-implied probability, while Kalshi and Betfair more commonly expose prices in different formats; Betfair’s exchange model also means users trade against each other, with commission on winnings, whereas spreads on odds and fees can differ materially across books and affect the effective price even when they point to the same weather event.

Historical framing matters because typhoon tracks in this basin often narrow only inside the last few days, and the big uncertainty is whether steering ridges push the core into Okinawa, the Ryukyus, or away from Japan entirely. Earlier reporting on Dolphin showed the forecast cone shifting by more than 1,000 kilometres and model guidance split between Japan, Taiwan, and China, which is exactly the sort of setup that can make pre-landfall probabilities move sharply as ensemble runs update[7][12][14]. That said, a 100% yes price indicates the market is now treating a Japanese coastline crossing as essentially locked in, which is usually a sign that the relevant forecast window has already collapsed to a near-certainty.

The main catalysts now are fresh JMA advisories, JTWC track updates, and live storm-position reports from major news outlets, because the contract resolves on the centre physically crossing Japanese land by 15 August, not on wind strength or near-miss impacts[1][2]. Traders on Polymarket and Kalshi should watch for any change in the official track language around Okinawa, Amami, Kyushu, or the main islands; on Betfair and Smarkets, liquidity and fee treatment can make the same update move displayed odds differently even when the underlying probability is similar. KYC access also differs by venue, so the set of participants able to trade the market is not identical across platforms, which can matter when a weather event is this close to resolution.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Will Super Typhoon Dolphin hit Japan? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Robinhood Prediction Markets, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.