S&P 500 (SPX) Up or Down on August 5?

Platform comparison

Market context

The S&P 500 is being priced as a one-sided finish, with the crowd implying **0% for Up** even though the index just printed a fresh record close the day before. That is a sharp divergence from the latest market backdrop: Reuters said investors were still talking up earnings strength, a reset in AI stocks and reasonable valuations, while Zacks reported the S&P 500 closed Tuesday at **7,736.52**, up **1.8%** and at an all-time closing high.[4][6] Technical coverage from CNBC noted the index had only recently cleared its prior June record area and that some analysts wanted confirmation above that level before calling the breakout durable.[19]

For context, the last session’s move was broad rather than narrowly tech-led, with the Dow and Nasdaq also setting or approaching records, and Saxo described the regime as a low-volatility bull with the S&P 500 trading above its 50-day moving average.[7][10] That makes a one-day decline on Wednesday possible, but the current 0% YES price appears far more extreme than the consensus tone in the underlying market commentary, which is still broadly risk-on rather than bearish.[4][10]

Traders watching the settlement should focus on the day’s macro calendar and any reversal in rates or oil. Saxo flagged U.S. ISM Services PMI and the ADP employment report for Wednesday, while the market was also digesting lower oil, a firmer dollar and the possibility of shifting Fed-cut expectations.[2][9] Tickerdaily highlighted higher Treasury yields, a stronger dollar and a Friday jobs report as the next important dependencies, with those inputs most likely to determine whether the S&P 500 can hold its record level or give back part of Tuesday’s advance.[3]

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 Best Prediction Markets, which mirrors the Polymarket order book directly.

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

Is this market available outside the US?

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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.

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