S&P 500 (SPY) closes above … on July 22?

Platform comparison

Market context

The S&P 500 ETF, tracked by SPY, is trading near the mid-740s, which puts any July 22 close-above level close to the market’s recent range rather than at an extreme. SPY was quoted around $747.47 with a prior close of $748.28, and other intraday quotes on 22 July sat in the same general area, while the recent all-time closing high was $757.62 on 2 June 2026.[1][3][5] On Polymarket, the ladder for this event is already priced with very high confidence at lower thresholds, with $720 shown at 100% and $730 at 99%, which highlights how the exact strike matters more than the headline probability.[4]

For comparison, this is where platform mechanics can change the reading: Polymarket displays direct implied probability, while Kalshi-style contracts are usually quoted in cents and map more clearly to a cash-settlement payoff; Betfair and Smarkets, by contrast, quote exchange-style decimal odds and embed a commission structure that can make the *effective* probability less obvious at first glance. That means a 0% YES on one venue may simply reflect the chosen threshold being set above the current SPY level, rather than a broad bearish call on equities. The main catalysts are the cash session close, any late-day macro headlines, and scheduled US market news that can move SPY in the final minutes; because settlement is based on the close, traders will care most about whether SPY can reclaim or hold above the strike into the closing auction rather than the midday tape.[1][4]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares S&P 500 (SPY) closes above … on July 22? 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 Kalshi Alternative, 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.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

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.