SPY (SPY) Up or Down on July 13?

Platform comparison

Market context

The market bets on whether the S&P 500 ETF (SPY) closes higher on Monday, 13 July 2026, than it did on the previous trading day, with the crowd currently pricing a 22% chance of an upward move. This binary outcome hinges entirely on the daily price delta between consecutive sessions, a mechanic that often defies longer-term trend intuition.

Historically, single-day reversals on Mondays are less common than the market implies, yet the 22% implied probability suggests traders anticipate a specific downside catalyst or a weekend accumulation of negative sentiment. Comparable cases from mid-2026 show SPY hovering near all-time highs, with the ETF hitting a peak of $757.62 in early June before stabilising around $754.94 by mid-July [5]. When indices trade near record levels, the probability of a daily drop often increases due to profit-taking, yet the current odds appear lower than the typical 30–35% frequency of negative Monday closes in bull markets, indicating a divergence from historical norms where prediction markets often underweight short-term volatility.

Traders should monitor the US labour data releases and any Federal Reserve commentary scheduled for the weekend, as these often dictate Monday’s opening direction. Recent volatility in May 2026, where SPY dipped from $749.53 to $738.47 in two days, highlights how quickly sentiment can shift on macro news [2]. With the settlement window closing at 20:00 UTC on 13 July, the focus remains on whether the ETF can sustain its position above the $745 level seen on 8 July [4], or if it will succumb to the pressure that has kept the "Up" probability suppressed at 22%.

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 Kalshi vs Polymarket, which mirrors the Polymarket order book directly.

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

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 Kalshi vs Polymarket. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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