{"$schema":"https://gamma-api.polymarket.com/schemas/Market.json","id":"4551311","question":"S&P 500 (SPX) Opens Up or Down on September 15?","conditionId":"0xf884199cc39ebe16c89be39d2bc6676b7c47d340eccc34c82ab66c66394c3333","slug":"spx-opens-up-or-down-on-september-15-2026","resolutionSource":"https://www.wsj.com/market-data/stocks","endDate":"2026-09-15T20:00:00Z","liquidity":"121828.35004","startDate":"2026-09-14T12:01:09Z","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 15 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 15 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":"[\"0.0005\", \"0.9995\"]","volume":"76973.31502500002","active":true,"closed":false,"marketMakerAddress":"","createdAt":"2026-09-14T12:00:51.369255Z","updatedAt":"2026-09-15T20:38:41.821866Z","new":false,"featured":false,"archived":false,"resolvedBy":"0x65070BE91477460D8A7AeEb94ef92fe056C2f2A7","restricted":true,"questionID":"0x9f6cf4f035233215310249c7ae0b09abff6fa267009db5ae5dfdf9bf2ec23f78","enableOrderBook":true,"orderPriceMinTickSize":0.001,"orderMinSize":5,"umaResolutionStatus":"proposed","volumeNum":76973.31502500002,"liquidityNum":121828.35004,"endDateIso":"2026-09-15","startDateIso":"2026-09-14","hasReviewedDates":true,"volume24hr":76958.315025,"volume1wk":76973.315025,"volume1mo":76973.315025,"volume1yr":76973.315025,"gameStartTime":"2026-09-14 21:00:00+00","clobTokenIds":"[\"47211161414726890439940880532662183858696310311556953513973546817467187758922\", \"8276378969463222655263171237127394272024034447040443216916014553040131711009\"]","comboStatus":"disabled","umaBond":"250","umaReward":"0.6","volume24hrClob":76958.315025,"volume1wkClob":76973.315025,"volume1moClob":76973.315025,"volume1yrClob":76973.315025,"volumeClob":76973.31502500002,"liquidityClob":121828.35004,"makerBaseFee":1000,"takerBaseFee":1000,"acceptingOrders":true,"negRisk":false,"ready":false,"funded":false,"acceptingOrdersTimestamp":"2026-09-14T12:01:09Z","cyom":false,"competitive":0.8003199679231757,"pagerDutyNotificationEnabled":false,"approved":true,"rewardsMinSize":20,"rewardsMaxSpread":4.5,"spread":0.001,"oneDayPriceChange":-0.5945,"lastTradePrice":0.001,"bestAsk":0.001,"automaticallyActive":true,"clearBookOnStart":false,"manualActivation":false,"negRiskOther":false,"umaResolutionStatuses":"[\"proposed\", \"proposed\"]","pendingDeployment":false,"deploying":false,"deployingTimestamp":"2026-09-14T12:00:52.469841Z","rfqEnabled":false,"eventStartTime":"2026-09-15T13:30:00Z","holdingRewardsEnabled":false,"feesEnabled":true,"requiresTranslation":false,"feeType":"finance_prices_fees","feeSchedule":{"exponent":1,"rate":0.04,"takerOnly":true,"rebateRate":0.25},"version":"v1"}