{"$schema":"https://gamma-api.polymarket.com/schemas/Market.json","id":"4584386","question":"S&P 500 (SPX) Opens Up or Down on September 16?","conditionId":"0x4778c3c56eb2a7292c69aaeebedddffbe147f1936b92db9e00e54e4e88225c91","slug":"spx-opens-up-or-down-on-september-16-2026","resolutionSource":"https://www.wsj.com/market-data/stocks","endDate":"2026-09-16T20:00:00Z","startDate":"2026-09-15T12:01:01Z","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 16 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 16 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":"13836.294125999999","active":true,"closed":true,"marketMakerAddress":"","createdAt":"2026-09-15T12:00:51.245201Z","updatedAt":"2026-09-17T18:13:31.949602Z","closedTime":"2026-09-16 22:32:22+00","new":false,"featured":false,"archived":false,"resolvedBy":"0x65070BE91477460D8A7AeEb94ef92fe056C2f2A7","restricted":true,"questionID":"0xe40c3bf29cf4c7bad16a94e0d9fd69acd501d2efd3ef39c0ac595bf0650cd544","umaEndDate":"2026-09-16T22:32:22Z","enableOrderBook":true,"orderPriceMinTickSize":0.001,"orderMinSize":5,"umaResolutionStatus":"resolved","volumeNum":13836.294125999999,"endDateIso":"2026-09-16","startDateIso":"2026-09-15","hasReviewedDates":true,"gameStartTime":"2026-09-15 21:00:00+00","clobTokenIds":"[\"7876207868282317610165998819437194381343124008855403979160018731271388057425\", \"21905365336266115042594979183031940411806144637996886816081432727832035876475\"]","comboStatus":"disabled","umaBond":"250","umaReward":"0.6","volumeClob":13836.294125999999,"makerBaseFee":1000,"takerBaseFee":1000,"acceptingOrders":false,"negRisk":false,"ready":false,"funded":false,"acceptingOrdersTimestamp":"2026-09-15T12:01:01Z","cyom":false,"pagerDutyNotificationEnabled":false,"approved":true,"rewardsMinSize":20,"rewardsMaxSpread":4.5,"spread":0.001,"automaticallyResolved":true,"oneDayPriceChange":0.3745,"lastTradePrice":0.999,"bestBid":0.999,"bestAsk":1,"automaticallyActive":true,"clearBookOnStart":false,"manualActivation":false,"negRiskOther":false,"umaResolutionStatuses":"[\"proposed\", \"proposed\"]","pendingDeployment":false,"deploying":false,"deployingTimestamp":"2026-09-15T12:00:51.54513Z","rfqEnabled":false,"eventStartTime":"2026-09-16T13:30:00Z","holdingRewardsEnabled":false,"feesEnabled":true,"requiresTranslation":false,"feeType":"finance_prices_fees","feeSchedule":{"exponent":1,"rate":0.04,"takerOnly":true,"rebateRate":0.25},"version":"v1"}