{"$schema":"https://gamma-api.polymarket.com/schemas/Market.json","id":"4683828","question":"S&P 500 (SPX) Opens Up or Down on September 21?","conditionId":"0xe84827a94c7695ab0b82eccc0018bd0dd8119fb9c8bd14e986bbfade1d67c805","slug":"spx-opens-up-or-down-on-september-21-2026","resolutionSource":"https://www.wsj.com/market-data/stocks","endDate":"2026-09-21T20:00:00Z","startDate":"2026-09-18T12:01:03Z","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/s-and-p-500-1e40af6979.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/s-and-p-500-1e40af6979.png","description":"This market will resolve to \"Up\" if the official S&P 500 Index open price for S&P 500 (SPX) on September 21 is higher than the official S&P 500 Index closing price for SPX on the most recent prior trading day.\n\nThis market will resolve to \"Down\" if the official S&P 500 Index open price for S&P 500 (SPX) on September 21 is lower than the official S&P 500 Index closing price for SPX on the most recent prior trading day.\n\nE.g., ordinarily, a market on Monday would refer to the previous Friday for its most recent closing price, unless that Friday were a market holiday, in which case it would refer to Thursday, or the next most recent trading day.\n\nIf the two prices are exactly equal, this market will resolve 50-50. Note that all figures will be rounded to the nearest cent using standard rounding.\n\nIf SPX does not trade at all during the regular session, the market will resolve 50-50.\n\nIf either of the relevant days are shortened (for example, due to a market holiday schedule), the official open/close price published by S&P 500 Index for that shortened session will still be used for resolution.\n\nIf the previous trading day has no official closing price (for example, due to a trading halt into the market close, system issue, delisting, or other disruption), the market will use the last valid on-exchange trade price of the regular session as the effective closing price.\n\nThe resolution source for this market is the Wall Street Journal, specifically the Open/Close values published by the WSJ under \"Historical Prices\".\n\nUS: https://www.wsj.com/market-data/stocks\nEMEA: https://www.wsj.com/market-data/stocks/emea\nASIA: https://www.wsj.com/market-data/stocks/asia","outcomes":"[\"Up\", \"Down\"]","outcomePrices":"[\"1\", \"0\"]","volume":"12084.517784","active":true,"closed":true,"marketMakerAddress":"","createdAt":"2026-09-18T12:00:51.305042Z","updatedAt":"2026-09-22T16:04:08.760593Z","closedTime":"2026-09-21 22:34:16+00","new":false,"featured":false,"archived":false,"resolvedBy":"0x65070BE91477460D8A7AeEb94ef92fe056C2f2A7","restricted":true,"questionID":"0xa8cb8d710692e789337fb3fff3eaa673164fda5571f2064050db71ec2e62aa20","umaEndDate":"2026-09-21T22:34:16Z","enableOrderBook":true,"orderPriceMinTickSize":0.001,"orderMinSize":5,"umaResolutionStatus":"resolved","volumeNum":12084.517784,"endDateIso":"2026-09-21","startDateIso":"2026-09-18","hasReviewedDates":true,"gameStartTime":"2026-09-20 21:00:00+00","clobTokenIds":"[\"92525122224574095483476239284915212958067517592233146984311501141806337272434\", \"84827631493310379105367795353528875066708261282141005565672244633596441931542\"]","comboStatus":"disabled","umaBond":"250","umaReward":"0.6","volumeClob":12084.517784,"makerBaseFee":1000,"takerBaseFee":1000,"acceptingOrders":false,"negRisk":false,"ready":false,"funded":false,"acceptingOrdersTimestamp":"2026-09-18T12:01:03Z","cyom":false,"pagerDutyNotificationEnabled":false,"approved":true,"rewardsMinSize":20,"rewardsMaxSpread":4.5,"spread":0.001,"automaticallyResolved":true,"oneDayPriceChange":0.2695,"lastTradePrice":0.999,"bestBid":0.999,"bestAsk":1,"automaticallyActive":true,"clearBookOnStart":false,"manualActivation":false,"negRiskOther":false,"umaResolutionStatuses":"[\"proposed\", \"proposed\"]","pendingDeployment":false,"deploying":false,"deployingTimestamp":"2026-09-18T12:00:52.620398Z","rfqEnabled":false,"eventStartTime":"2026-09-21T13:30:00Z","holdingRewardsEnabled":false,"feesEnabled":true,"requiresTranslation":false,"feeType":"finance_prices_fees","feeSchedule":{"exponent":1,"rate":0.04,"takerOnly":true,"rebateRate":0.25},"version":"v1"}