Pronóstico: S&P 500 (SPX) Up or Down on July 13?

Platform comparison

Market context

The S&P 500 will either close higher or lower on Monday, 13 July 2026 compared to its previous trading day's close. The 0% YES probability currently priced on Polymarket suggests traders are positioning heavily toward a down day, though this extreme reading warrants scrutiny given that daily equity moves remain genuinely uncertain. On-chain USDC settlement via Polygon conditional tokens means resolution hinges entirely on official closing data from S&P Dow Jones Indices, with no discretion for interpretation.

Historical context shows single-day S&P 500 moves follow no predictable pattern. Across the past decade, roughly 51–52% of trading days close higher than the previous session, with the remainder lower. July historically presents mixed seasonality; the month has delivered positive returns in 16 of the past 20 years, but individual days within July show no meaningful directional bias. A 0% probability for an up day contradicts this baseline distribution and suggests market participants are pricing in specific downside catalysts rather than reflecting genuine uncertainty.

Traders monitoring this contract should track mid-July economic releases and Federal Reserve communications. The Consumer Price Index typically arrives in mid-July, and any inflation surprise could drive directional conviction on 13 July itself. Additionally, earnings season dynamics and geopolitical developments in early July will shape positioning. The settlement window closes at 20:00 UTC on 13 July, giving traders until US market close to adjust positions based on intraday momentum and late-session flows.

Methodology

We track Pronóstico: S&P 500 (SPX) Up or Down on July 13? 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

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

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.

Do I need to KYC for this market?

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

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.