{"source":"polymarket","id":"728970","ticker":"spx-opens-up-or-down-on-july-22-2026","slug":"spx-opens-up-or-down-on-july-22-2026","title":"S&P 500 (SPX) Opens Up or Down on July 22?","description":"This market will resolve to \"Up\" if the official S&P 500 Index open price for S&P 500 (SPX) on July 22 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 July 22 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":"2026-07-21T12:00:14Z","end_date":"2026-07-22T20:00:00Z","closed_time":null,"volume":6893.7757169999995,"volume_24hr":6893.7757169999995,"volume_24h_change":null,"normalized_vol_24hr":31.37820816040039,"normalized_volume":15.867491722106934,"liquidity":3111.2606,"open_interest":3164.880312,"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":0.18,"top_outcome_prob_24h_change":-0.32,"top_outcome_volume_24h_change":6893.7757169999995,"updated_at":"2026-07-22T07:05:49.340475Z","fetched_at":"2026-07-22T07:05:49.340475Z","added_at":"2026-07-21T12:15:39.355902Z","url":"https://polymarket.com/event/spx-opens-up-or-down-on-july-22-2026","chart_24h":[0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,171.078604,171.078604,171.078604,537.542204,1068.84998,1254.035164,1498.903087,1507.333087,1706.653463,2507.643463,2517.643463,2779.623463,3216.033613,3455.9785269999993,3610.9785269999993,3855.0705339999995,4188.581714,4817.1517140000005,6678.3894629999995],"markets":[{"source":"polymarket","id":"3016272","event_id":"728970","slug":"spx-opens-up-or-down-on-july-22-2026","question":"S&P 500 (SPX) Opens Up or Down on July 22?","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 July 22 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 July 22 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":[0.18,0.82],"probability":0.18,"spread":0.02,"active":true,"closed":false,"start_date":"2026-07-21T12:00:14Z","end_date":"2026-07-22T20:00:00Z","closed_time":null,"volume":6893.7757169999995,"volume_24hr":6893.7757169999995,"prob_24h_change":-0.32,"volume_24h_change":6893.7757169999995,"normalized_vol_24hr":31.368024826049805,"normalized_volume":21.693635940551758,"liquidity":3057.1044,"categories":["Finance"],"countries":[],"updated_at":"2026-07-22T07:06:43.353745Z","fetched_at":"2026-07-22T07:05:49.474734Z","added_at":"2026-07-21T12:15:39.410964Z","url":"https://polymarket.com/event/spx-opens-up-or-down-on-july-22-2026/spx-opens-up-or-down-on-july-22-2026","event_title":"S&P 500 (SPX) Opens Up or Down on July 22?","chart_24h":[0.5,0.5,0.56,0.6,0.65,0.68,0.67,0.575,0.615,0.52,0.525,0.455,0.48,0.49,0.5,0.515,0.53,0.58,0.56,0.46,0.52,0.485,0.505,0.485,0.465,0.41,0.41,0.36,0.36,0.185]}],"_meta":{"attribution":"pdata.world — aggregated prediction-market data across 8 platforms","canonical_url":"https://pdata.world/events/polymarket/728970","as_of":"2026-07-22T07:16:22.715357Z","docs":"https://api.pdata.world/docs","cite_as":"According to pdata.world (tracking Polymarket): \"S&P 500 (SPX) Opens Up or Down on July 22?\" — top market at 18% probability across 1 outcome","source_url":null}}