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

Platform comparison

Market context

The market resolves based on whether the S&P 500 closes higher or lower on Monday, 13 July 2026, compared to the prior trading day’s official close, which is typically Friday, 10 July. With the index at 7,575.39 after Friday’s 0.42% gain, the current 10% crowd-implied probability for an “Up” outcome suggests traders expect a decline or flat close, despite the recent upward momentum[5][7].

Historically, Monday closes following strong Friday gains often see mean reversion, particularly in mid-July when summer liquidity thins and volatility compresses. Over the past 52 weeks, the SPX has ranged between 6,201.59 and 7,620.90, with Friday, 10 July closing near the 52-week high of 7,579.93, leaving little room for further upside without a catalyst[3][6]. Programmatically, traders would backtest Monday–Friday return patterns post-2020 to calibrate conditional orders, using the 10% probability as a signal to short directional exposure or hedge via futures.

Key catalysts include the July FOMC meeting minutes release, scheduled for 15 July but often influencing pre-meeting positioning, and any unexpected commentary from Fed officials ahead of the data blackout period. Recent reports note heightened sensitivity to inflation data and labour market signals, which could trigger intraday swings before settlement[2]. A copy-trading bot would monitor S&P 500 futures (ES) for breaks above 7,625 or below 7,500, adjusting conditional orders in real time to capture the binary outcome.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews S&P 500 (SPX) Up or Down on July 13? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Review UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

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'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 Review UK 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.