SPY (SPY) Up or Down on July 13?

Platform comparison

Market context

The market bets on whether the SPY ETF closes higher on Monday, 13 July 2026, than it did on the prior trading day—ordinarily Friday, 10 July, unless that day was a holiday. With the crowd assigning only a 24% implied probability to an “Up” resolution, traders are pricing in a likely daily dip despite SPY’s recent strength near its 52-week high of 760.40[6].

Historically, single-day SPY moves around mid-July show modest volatility, with daily closes often oscillating within 1–2% of the prior day. In 2025, mid-July saw three down days and two up days over a five-day window, while 2024 exhibited similar balance. The current 24% YES probability suggests a sharper-than-average bearish tilt, possibly reflecting expectations of profit-taking after SPY’s all-time close of 757.62 on 2 June[6]. On platforms like Kalshi, this would be quoted as decimal odds of roughly 4.17, whereas Polymarket displays it directly as 24% implied probability—a key divergence for users comparing fee structures and KYC requirements across books.

Traders should monitor the Federal Reserve’s July 11–12 meeting outcome, released before market open on 13 July, and any surprise comments on inflation or rate paths that could sway equity sentiment. The U.S. labour data release scheduled for 11 July (Friday) may also influence Friday’s close, setting the baseline for Monday’s comparison[6]. Additionally, check for any SPY-specific liquidity events or ETF rebalancing near the closing auction, which runs 3:50–4:00 pm Eastern and can affect final pricing[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares SPY (SPY) Up or Down on July 13? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Alternative UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative UK offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.