{"source":"polymarket","id":"776473","ticker":"spx-opens-up-or-down-on-august-3-2026","slug":"spx-opens-up-or-down-on-august-3-2026","title":"S&P 500 (SPX) Opens Up or Down on August 3?","description":"This market will resolve to \"Up\" if the official S&P 500 Index open price for S&P 500 (SPX) on August 3 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 3 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":"2026-07-31T12:00:17Z","end_date":"2026-08-03T20:00:00Z","closed_time":null,"volume":4060.460348,"volume_24hr":3044.704807,"volume_24h_change":null,"normalized_vol_24hr":25.892900466918945,"normalized_volume":15.735969543457031,"liquidity":1954.9781,"open_interest":3280.597053,"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":0.955,"top_outcome_prob_24h_change":0.21999999999999997,"top_outcome_volume_24h_change":2501.237797,"updated_at":"2026-08-03T04:41:42.161666Z","fetched_at":"2026-08-03T04:41:42.161666Z","added_at":"2026-07-31T12:39:35.664249Z","url":"https://polymarket.com/event/spx-opens-up-or-down-on-august-3-2026","chart_24h":[543.4670100000001,543.4670100000001,553.4670100000001,553.46701,553.4670100000001,553.4670100000001,563.4670100000001,545.194284,605.194284,615.194284,615.194284,489.994284,454.28,454.28,409.28,429.753084,429.753084,429.753084,878.5683,878.5683,971.3783,1086.3783,1086.3783,1220.540675,2964.70955,2964.70955,3044.704807],"markets":[{"source":"polymarket","id":"3239538","event_id":"776473","slug":"spx-opens-up-or-down-on-august-3-2026","question":"S&P 500 (SPX) Opens Up or Down on August 3?","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 3 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 3 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":[0.955,0.045],"probability":0.955,"spread":0.01,"active":true,"closed":false,"start_date":"2026-07-31T12:00:17Z","end_date":"2026-08-03T20:00:00Z","closed_time":null,"volume":4060.460348,"volume_24hr":3044.704807,"prob_24h_change":0.21999999999999997,"volume_24h_change":2501.237797,"normalized_vol_24hr":29.034149169921875,"normalized_volume":20.257080078125,"liquidity":1959.432,"categories":["Finance"],"countries":[],"updated_at":"2026-08-03T04:41:42.401157Z","fetched_at":"2026-08-03T04:41:42.401157Z","added_at":"2026-07-31T12:39:35.766087Z","url":"https://polymarket.com/event/spx-opens-up-or-down-on-august-3-2026/spx-opens-up-or-down-on-august-3-2026","event_title":"S&P 500 (SPX) Opens Up or Down on August 3?","chart_24h":[0.73,0.73,0.82,0.82,0.815,0.81,0.8,0.77,0.725,0.72,0.72,0.745,0.745,0.75,0.75,0.785,0.79,0.775,0.775,0.79,0.81,0.815,0.855,0.915,0.95]}],"_meta":{"attribution":"pdata.world — aggregated prediction-market data across 8 platforms","canonical_url":"https://pdata.world/events/polymarket/776473","as_of":"2026-08-03T04:42:30.171891Z","docs":"https://api.pdata.world/docs","cite_as":"According to pdata.world (tracking Polymarket): \"S&P 500 (SPX) Opens Up or Down on August 3?\" — top market at 96% probability across 1 outcome","source_url":null}}