{"source":"polymarket","id":"636584","ticker":"spx-opens-up-or-down-on-june-29-2026","slug":"spx-opens-up-or-down-on-june-29-2026","title":"S&P 500 (SPX) Opens Up or Down on June 29?","description":"This market will resolve to \"Up\" if the official S&P 500 Index open price for S&P 500 (SPX) on June 29 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 June 29 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":"2026-06-26T12:02:55.198769Z","end_date":"2026-06-29T20:00:00Z","closed_time":null,"volume":5222.813533999998,"volume_24hr":4822.988534,"volume_24h_change":null,"normalized_vol_24hr":21.931371688842773,"normalized_volume":15.223986625671387,"liquidity":2080.8891,"open_interest":3473.224374,"categories":["Finance"],"tags":[{"id":"102127","slug":"up-or-down","label":"Up or Down"},{"id":"102682","slug":"indicies","label":"Indicies"},{"id":"120","slug":"finance","label":"Finance"},{"id":"102683","slug":"spx","label":"SPX"},{"id":"102281","slug":"daily","label":"Daily"},{"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":0.855,"top_outcome_prob_24h_change":0.38,"top_outcome_volume_24h_change":4822.988534,"updated_at":"2026-06-29T04:46:49.471916Z","fetched_at":"2026-06-29T04:46:49.471916Z","added_at":"2026-06-26T12:12:06.752131Z","url":"https://polymarket.com/event/spx-opens-up-or-down-on-june-29-2026","chart_24h":[0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,56.57149,56.57149,56.57149,56.57149,215.268802,425.268802,425.268802,509.268802,559.268802,681.660935,1391.465519,2127.168966,2127.168966,2199.038966,3456.286711,3787.2396770000005,4458.125202,4665.655202],"markets":[{"source":"polymarket","id":"2691532","event_id":"636584","slug":"spx-opens-up-or-down-on-june-29-2026","question":"S&P 500 (SPX) Opens Up or Down on June 29?","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 June 29 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 June 29 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":[0.855,0.145],"probability":0.855,"spread":0.03,"active":true,"closed":false,"start_date":"2026-06-26T12:02:55.198769Z","end_date":"2026-06-29T20:00:00Z","closed_time":null,"volume":5222.813533999998,"volume_24hr":4822.988534,"prob_24h_change":0.38,"volume_24h_change":4822.988534,"normalized_vol_24hr":23.828556060791016,"normalized_volume":21.36952018737793,"liquidity":2066.0583,"categories":["Finance"],"countries":[],"updated_at":"2026-06-29T04:48:12.210894Z","fetched_at":"2026-06-29T04:46:49.654539Z","added_at":"2026-06-26T12:12:06.875321Z","url":"https://polymarket.com/event/spx-opens-up-or-down-on-june-29-2026/spx-opens-up-or-down-on-june-29-2026","event_title":"S&P 500 (SPX) Opens Up or Down on June 29?","chart_24h":[0.475,0.465,0.465,0.54,0.47,0.565,0.575,0.805,0.815,0.675,0.745,0.75,0.775,0.8,0.87,0.85,0.86]}],"_meta":{"attribution":"pdata.world — aggregated prediction-market data across 8 platforms","canonical_url":"https://pdata.world/events/polymarket/636584","as_of":"2026-06-29T04:50:41.313504Z","docs":"https://api.pdata.world/docs","cite_as":"According to pdata.world (tracking Polymarket): \"S&P 500 (SPX) Opens Up or Down on June 29?\" — top market at 86% probability across 1 outcome","source_url":null}}