Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Is Kalshi Legal in California) Pick polygram.ink (preferred broker) |
95% | 5% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Go to the live market → |
Polymarket (direct) polymarket.com |
95% | 5% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Go to the live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Go to the live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Go to the live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Go to the live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 0 | 95% |
| 1 | 3% |
| 4 | 1% |
| 2 | 0% |
| 3 | 0% |
| 5 | 0% |
| >5 | 0% |
Market context
A magnitude 6.5-plus earthquake anywhere on Earth is a geophysically routine event, but it is still a comparatively high bar: USGS treats 6.5 as the threshold for its world M6+ catalogue, and its “significant earthquakes” page uses a significance score that captures impacts as well as size.[8][1] That matters for this market because the contract resolves on the USGS search feed for the specified UTC window, so the key issue is whether one or more qualifying events are recorded by the agency before the settlement cut-off, not whether they were widely reported first.[9]
The 95% crowd probability is broadly consistent with recent comparable activity. Public earthquake round-ups in 2026 show at least one major global sequence this year, including the Mindanao event that produced very large aftershock activity and multiple 6.5-class shocks, while USGS’s 2026 world pages and third-party year-to-date trackers show a steady flow of M6+ events across the globe.[12][8][3] In practical terms, that means this market is read less like a binary “will there be an earthquake?” and more like a count of whether the week contains the kind of strong tectonic release that usually appears somewhere in the Pacific margin, Indonesia, or other active subduction zones.[1][8]
For accessibility, the relevant framework is mostly exchange and jurisdictional rather than seismic: German GlüStV rules can affect whether a user in Germany can access or be offered the market at all, while US CFTC reach is the main policy issue for US-facing platforms and participants. A “no-KYC up to $1,500” allowance generally means small accounts can trade before completing full identity verification, which lowers friction for this market, but it does not remove any local blocking, geofencing, or source-of-funds checks that an exchange may apply at withdrawal or higher volume. Traders also watch USGS updates closely, because late-posted events are sometimes added after the quake time but before the catalogue is finalised.[9][1]
Methodology
This overview of How many 6.5 or above earthquakes August 3 - August 9? 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. Is Kalshi Legal in California has a different geo footprint.
- 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.
- Can I trade anonymously?
- Pseudonymously, yes — up to the KYC threshold. Is Kalshi Legal in California stores an email address and wallet addresses rather than a legal name. Over $1,500 lifetime volume triggers KYC, after which identity is no longer anonymous.
- What happens during a tax audit?
- You're responsible for documenting your trades. Is Kalshi Legal in California exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.
- 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).
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