Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Robinhood Prediction Markets) Pick polygram.ink (preferred broker) |
57% | 43% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Go to the live market → |
Polymarket (direct) polymarket.com |
57% | 43% | 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 |
|---|---|
| September 30? | 57% |
| August 30? | 38% |
| August 9? | 24% |
Market context
Max Miller is under pressure in Ohio’s 7th District after allegations of domestic abuse and separate scrutiny from the House Ethics Committee, but he has publicly said he will stay in the race and has not announced any withdrawal. Recent reporting also says he intends to put about $1 million into his campaign, which is a concrete signal against a near-term exit even as party figures urge him to step aside.[2][7][11]
For pricing, the current 22% yes probability implies a low-but-real chance of a late reversal rather than a base case of withdrawal. Comparable cases suggest traders should treat public denials seriously unless they are followed by a formal campaign suspension, ballot-removal filing, or an official statement from Miller’s legal team; in this sort of event-driven market, the catalyst is usually not polling but process. On Kalshi, similar political contracts are quoted in decimal-style market pricing and can move quickly on headlines, while Polymarket, Smarkets and Betfair-style books tend to express probability or odds differently, with fees, liquidity and KYC access varying by platform, so the same underlying event can look less or more likely depending on where it is traded.[16]
The key watchpoints are any overnight or weekend statement from Miller, a filing or notice from Ohio Republican officials, and whether the party actually has time to replace him before the August deadline cited in recent reporting. NPR said Ohio Republicans face a next-week ballot deadline, while The New York Times reported that local officials would need notice to convene and may require Miller to exit by Friday or Saturday for a replacement to be practical, which means the market is heavily time-sensitive even if the congressman keeps rejecting calls to quit.[7][11]
Methodology
We read Will Max Miller drop out of the OH-07 race by 2026? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.
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 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.
- Are all these platforms regulated?
- No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.
- 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.
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