{"source":"polymarket","id":"843447","ticker":"spx-opens-up-or-down-on-august-14-2026","slug":"spx-opens-up-or-down-on-august-14-2026","title":"S&P 500 (SPX) Opens Up or Down on August 14?","description":"This market will resolve to \"Up\" if the official S&P 500 Index open price for S&P 500 (SPX) on August 14 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 August 14 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","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","active":true,"closed":false,"start_date":"2026-08-13T12:00:16Z","end_date":"2026-08-14T20:00:00Z","closed_time":null,"volume":11261.302275,"volume_24hr":11261.302274999998,"volume_24h_change":null,"normalized_vol_24hr":32.272125244140625,"normalized_volume":17.047548294067383,"liquidity":33661.21772,"open_interest":4606.097794,"categories":["Finance"],"tags":[{"id":"102683","slug":"spx","label":"SPX"},{"id":"102127","slug":"up-or-down","label":"Up or Down"},{"id":"102281","slug":"daily","label":"Daily"},{"id":"102682","slug":"indicies","label":"Indicies"},{"id":"120","slug":"finance","label":"Finance"},{"id":"102169","slug":"hide-from-new","label":"Hide From New"}],"synthetic":false,"is_group":false,"group_key":null,"parent_event_id":null,"probability":null,"spread":null,"top_outcome":"","top_outcome_probability":0.9995,"top_outcome_prob_24h_change":0.4045000000000001,"top_outcome_volume_24h_change":5715.27238,"updated_at":"2026-08-14T13:46:59.746685Z","fetched_at":"2026-08-14T13:46:59.746685Z","added_at":"2026-08-13T12:19:36.641012Z","url":"https://polymarket.com/event/spx-opens-up-or-down-on-august-14-2026","chart_24h":[0.0,0.0,0.0,0.0,0.0,100.0,138.59649000000002,318.443852,772.130517,782.130517,833.825431,913.825431,957.475963,1183.783154,1199.181891,1246.7418910000001,1246.7418910000001,1297.411891,1348.181441,2126.454167,2341.355114,3458.281911,4508.6178390000005,4519.736819000001,4588.624686,4851.365494,5715.27238],"markets":[{"source":"polymarket","id":"3563674","event_id":"843447","slug":"spx-opens-up-or-down-on-august-14-2026","question":"S&P 500 (SPX) Opens Up or Down on August 14?","group_item_title":null,"description":"This market will resolve to \"Up\" if the official S&P 500 Index open price for S&P 500 (SPX) on August 14 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 August 14 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","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","outcomes":["Up","Down"],"outcome_prices":[0.9995,0.0005],"probability":0.9995,"spread":0.001,"active":true,"closed":false,"start_date":"2026-08-13T12:00:16Z","end_date":"2026-08-14T20:00:00Z","closed_time":null,"volume":13980.902275,"volume_24hr":11261.302274999998,"prob_24h_change":0.4045000000000001,"volume_24h_change":5715.27238,"normalized_vol_24hr":34.3066291809082,"normalized_volume":21.957761764526367,"liquidity":33661.21772,"categories":["Finance"],"countries":[],"updated_at":"2026-08-14T13:48:37.605886Z","fetched_at":"2026-08-14T13:46:59.965331Z","added_at":"2026-08-13T12:19:36.761000Z","url":"https://polymarket.com/event/spx-opens-up-or-down-on-august-14-2026/spx-opens-up-or-down-on-august-14-2026","event_title":"S&P 500 (SPX) Opens Up or Down on August 14?","chart_24h":[0.595,0.675,0.58,0.62,0.59,0.525,0.54,0.545,0.53,0.54,0.555,0.605,0.615,0.565,0.565,0.585,0.59,0.57,0.57,0.565,0.55,0.56,0.625,0.705,0.69,0.73,0.865]}],"_meta":{"attribution":"pdata.world — aggregated prediction-market data across 8 platforms","canonical_url":"https://pdata.world/events/polymarket/843447","as_of":"2026-08-14T13:53:58.621245Z","docs":"https://api.pdata.world/docs","cite_as":"According to pdata.world (tracking Polymarket): \"S&P 500 (SPX) Opens Up or Down on August 14?\" — top market at 100% probability across 1 outcome","source_url":null}}