S&P 500 (SPX) Up or Down on July 9?

Platform comparison

Market context

The S&P 500 closes higher on Thursday, 9 July 2026 than it did on the most recent prior trading day, a daily gain that Polymarket prices at 100% certainty today. On the Polygon chain, this conditional token resolves in USDC once the official SPX close of 7,491.60 is confirmed against the prior day’s 7,482.71, locking in the “Up” outcome without ambiguity.

Historically, such absolute crowd-implied probabilities on daily SPX moves are rare and usually signal a known catalyst rather than random noise. In comparable cases, like the post-holiday rebounds in early 2024 or the FOMC-driven surges in mid-2025, the market had already priced in a specific announcement before the close, making the 100% rating a reflection of prior information, not a forecast of uncertainty.

Traders should watch the Federal Reserve’s 9 July 2026 policy statement and the accompanying economic projections, which often trigger immediate index moves. The Wall Street Journal noted that recent Fed communications have consistently driven SPX volatility within minutes of release, and the timing aligns precisely with today’s settlement window. Additionally, monitor the 10:00 EDT unemployment data release, which can override policy signals if the figures deviate sharply from expectations.

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 PolyGram, 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

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.

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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.