{"source":"polymarket","id":"800906","ticker":"spx-opens-up-or-down-on-august-6-2026","slug":"spx-opens-up-or-down-on-august-6-2026","title":"S&P 500 (SPX) Opens Up or Down on August 6?","description":"This market will resolve to \"Up\" if the official S&P 500 Index open price for S&P 500 (SPX) on August 6 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 6 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":"2026-08-05T12:00:14Z","end_date":"2026-08-06T20:00:00Z","closed_time":null,"volume":12123.069229,"volume_24hr":12123.069229,"volume_24h_change":null,"normalized_vol_24hr":35.62544250488281,"normalized_volume":20.148168563842773,"liquidity":2247.4456,"open_interest":8114.563631,"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":0.815,"top_outcome_prob_24h_change":0.18999999999999995,"top_outcome_volume_24h_change":12123.069229,"updated_at":"2026-08-06T10:16:25.204014Z","fetched_at":"2026-08-06T10:16:25.204014Z","added_at":"2026-08-05T12:20:29.611455Z","url":"https://polymarket.com/event/spx-opens-up-or-down-on-august-6-2026","chart_24h":[0.0,0.0,0.0,0.0,0.0,0.0,0.0,713.254065,713.254065,824.873111,924.873111,924.873111,1435.750149,1548.960149,1820.827925,1974.311842,2348.043369,2377.44925,5633.354601,8791.654600999998,9125.202025,10212.809901,11861.701111999999,12123.069229],"markets":[{"source":"polymarket","id":"3359007","event_id":"800906","slug":"spx-opens-up-or-down-on-august-6-2026","question":"S&P 500 (SPX) Opens Up or Down on August 6?","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 6 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 6 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":[0.815,0.185],"probability":0.815,"spread":0.09,"active":true,"closed":false,"start_date":"2026-08-05T12:00:14Z","end_date":"2026-08-06T20:00:00Z","closed_time":null,"volume":12123.069229,"volume_24hr":12123.069229,"prob_24h_change":0.18999999999999995,"volume_24h_change":12123.069229,"normalized_vol_24hr":39.52371597290039,"normalized_volume":25.94037628173828,"liquidity":2205.4105,"categories":["Finance"],"countries":[],"updated_at":"2026-08-06T10:20:47.609492Z","fetched_at":"2026-08-06T10:16:25.370329Z","added_at":"2026-08-05T12:20:29.690650Z","url":"https://polymarket.com/event/spx-opens-up-or-down-on-august-6-2026/spx-opens-up-or-down-on-august-6-2026","event_title":"S&P 500 (SPX) Opens Up or Down on August 6?","chart_24h":[0.625,0.56,0.56,0.615,0.635,0.565,0.62,0.585,0.645,0.635,0.615,0.645,0.59,0.68,0.72,0.67,0.7,0.79,0.705,0.755,0.76,0.795,0.815]}],"_meta":{"attribution":"pdata.world — aggregated prediction-market data across 8 platforms","canonical_url":"https://pdata.world/events/polymarket/800906","as_of":"2026-08-06T10:32:57.491377Z","docs":"https://api.pdata.world/docs","cite_as":"According to pdata.world (tracking Polymarket): \"S&P 500 (SPX) Opens Up or Down on August 6?\" — top market at 82% probability across 1 outcome","source_url":null}}