S&P 500 (SPX) Up or Down on July 22?

Platform comparison

Market context

US equities turned higher in the last 24 hours, with the S&P 500 advancing on Tuesday after cooler producer prices and lower Treasury yields improved sentiment. The index closed at 5,847.32, up 0.87%, while the Nasdaq led the move as investors rotated back into growth and chip stocks ahead of the next Federal Reserve meeting.[1]

That leaves the crowd’s 63% **YES** pricing consistent with a mildly bullish one-day backdrop rather than a strong trend call. The recent pattern is choppy: Monday’s broad sell-off was followed by a sharp rebound, and the index has been trading close to its recent range rather than breaking cleanly in either direction.[3][5] In comparable setups, a single-session move is often driven more by rate expectations and sector rotation than by the broader monthly trend, so one up day does not by itself make another probable.[1][6]

For the rest of the session, traders are watching Fed speakers, the next labour-market data release, and any further move in yields or oil prices, which have been key drivers of risk appetite this week.[1][6] Middle East tensions have also kept Brent crude elevated, and that matters because firmer energy prices can feed back into inflation expectations and bond yields, both of which influence index direction into the close.[5][6]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Prediction Today, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Prediction Today. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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 reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.