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

Platform comparison

Market context

The underlying event is the closing price of the SPDR S&P 500 ETF Trust (SPY) on 20 July 2026, which settled at $742.14, confirming the market’s 0% probability for any strike above this level [1][3]. Historically, SPY has rarely closed more than 2% below its 52-week high of $760.40, with the all-time peak of $757.62 recorded just weeks earlier in June 2026 [2][6]. Given that the current settlement sits only 2.4% below the recent high, strikes above $745 would have required a sustained breakout that did not materialise, making the 0% YES probability consistent with the asset’s tight range-bound behaviour in mid-2026.

Traders should monitor the Federal Reserve’s July meeting outcomes and upcoming Q2 earnings from mega-cap tech firms, as these typically drive SPY volatility in late July [5]. While crypto markets often correlate with SPY via BTC/ETH macro flows, the contract settles in USDC on-chain, meaning whale activity in Bitcoin or Ethereum could amplify spot moves if funding rates shift sharply. Recent data from Polymarket shows the $720 strike at 98% probability, reflecting crowd confidence that SPY will not breach higher levels, with the next closest outcome at $730 holding 96% [5]. Exchange spot prices and funding rates remain critical dependencies for any sudden deviation from the established range.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads S&P 500 (SPY) closes above … on July 20? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

Why USDC and not ETH or USDT?

USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

Can I use Bitcoin directly?

No, Polymarket operates exclusively in USDC on Polygon. You can bridge BTC to USDC via an exchange or bridge service and deposit on Polygon — typically 10-30 minutes processing time.

Which crypto markets exist on Polymarket?

Currently active markets include BTC/ETH/SOL price targets, halving dates, ETF approvals, hard-fork outcomes and Layer-2 TVL thresholds. The list updates weekly; biggest volume sits on BTC and ETH price forecasts.

Are crypto prediction markets taxable in the US?

In the US, prediction market gains are typically treated as ordinary income or short-term capital gains depending on holding period. Consult a tax professional for your specific situation — we cannot provide tax advice.