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

Platform comparison

Market context

The S&P 500 ETF needs to finish above the contract’s strike level at the close, and the live SPY price is sitting in the mid-740s, with recent prints around $747.47 and $749.81 on 22 July. That leaves the current 0% YES quote in sharp contrast with the cash market, suggesting the market is either mispriced, already deep-out-of-the-money versus the contract threshold, or that the exact strike level is materially higher than the visible SPY spot price and is not captured in the prompt.[1][2][4]

For context, SPY has spent most of 2026 well above its long-run average, with a June closing high of 757.62 and a 52-week high of 760.40, so a close above a lower strike would ordinarily be straightforward if the market is asking about a level materially beneath spot.[5] On Polymarket, the quote is expressed as implied probability, while Kalshi and exchange-style books more often present prices in cents or decimal odds; that makes a 0% YES reading especially sensitive to fee drag, minimum tick sizes, and whether the contract is KYC-gated to specific jurisdictions. Betfair and Smarkets can also diverge on effective pricing because commission is taken separately, so traders comparing platforms should normalise for spread and fees rather than reading the headline number in isolation.

The main catalysts are the cash equity close, any late-session macro move, and whether SPY’s final auction is distorted by headline risk, index rebalancing, or large options expiry effects. With the market resolving on or around the 20:00 UTC settlement window, traders should watch the closing print rather than intraday levels, because a brief late-day rally or sell-off can decide the outcome even if the day’s range looked stable.

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 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

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.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

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.

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.