S&P 500 (SPY) closes above … on July 20?

Platform comparison

Market context

The underlying event is whether the SPDR S&P 500 ETF Trust (SPY) finishes its trading day on 20 July above a specific strike price, a binary outcome that currently carries a 0% crowd-implied probability for a YES result. This near-zero pricing suggests the market views the threshold as effectively unreachable given current valuations, positioning the strike as the heavy favourite against any upside breach.

Historically, SPY has demonstrated strong resilience in mid-July, often consolidating gains before summer volatility eases. The ETF recently touched an all-time high of £757.62 on 2 June 2026 and holds a 52-week high of £760.40, with the latest closing price as of late June at £732.97 [3]. In comparable years, such as 2025 and 2024, mid-year rallies were common, yet the current 0% probability implies the strike sits well above even these peak levels, making it a stark underdog unless a sudden, unprecedented surge occurs.

Traders should monitor the Federal Reserve’s mid-July policy meeting outcomes and any upcoming earnings reports from mega-cap tech constituents, which often drive index momentum. Recent market data shows SPY trading at £744.48, just below its recent peaks, with a 0.054% intraday gain [1][2]. Any deviation from consensus inflation forecasts or unexpected corporate guidance could act as a catalyst, though the consensus remains firmly bearish on breaching the strike, leaving value potentially only for contrarian bets if macro data shifts sharply.

Sources: 1 · 2 · 3

Methodology

We track S&P 500 (SPY) closes above … on July 20? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.