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

Platform comparison

Market context

SPY closed at $742.14 on 20 July 2026, well above the $725 strike in the Polymarket contract, yet the YES side for “above $725” sits at 0% because the market’s leading outcome is actually the $720 strike at 98% probability, not the $725 threshold traders are asking about [1][5]. This apparent contradiction stems from how Polymarket structures multi-outcome events: each strike is a separate conditional token on Polygon, settled in USDC, and the 0% reflects that the crowd has already priced the $720 outcome as virtually certain, making higher strikes redundant for settlement [5].

Historically, when SPY trades near its 52-week high of $760.40, July closes tend to cluster within a narrow band below that peak; the all-time closing high was $757.62 on 2 June 2026, and the average 52-week price is $678.40, meaning a $725 close is already deep in the upper quartile of recent range [3][6]. In such regimes, conditional tokens for strikes above the current close often collapse to near-zero as traders front-run the most probable settlement level, which here is $720, not $725.

Traders should watch the Federal Reserve’s July meeting minutes release and any surprise commentary on inflation or rate cuts, as these can trigger intraday swings that alter the final close [2]. With SPY at $742.14, the $725 strike is already in-the-money, but the market’s 0% YES implies the contract will settle on $720, not $725, due to the multi-outcome design where only one strike wins [5]. Monitor the USDC liquidity depth on Polygon for the $720 and $730 tokens, as thin order books can skew implied probabilities before settlement.

Sources: 1 · 2 · 3 · 4 · 5

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 PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.