{"source":"polymarket","id":"647577","ticker":"spx-opens-up-or-down-on-june-30-2026","slug":"spx-opens-up-or-down-on-june-30-2026","title":"S&P 500 (SPX) Opens Up or Down on June 30?","description":"This market will resolve to \"Up\" if the official S&P 500 Index open price for S&P 500 (SPX) on June 30 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 30 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":"2026-06-29T12:02:06.038214Z","end_date":"2026-06-30T20:00:00Z","closed_time":null,"volume":4947.274084000001,"volume_24hr":4947.274084,"volume_24h_change":null,"normalized_vol_24hr":20.885234832763672,"normalized_volume":14.980639457702637,"liquidity":1137.7004,"open_interest":2837.287991,"categories":["Finance"],"tags":[{"id":"102682","slug":"indicies","label":"Indicies"},{"id":"102169","slug":"hide-from-new","label":"Hide From New"},{"id":"102683","slug":"spx","label":"SPX"},{"id":"102281","slug":"daily","label":"Daily"},{"id":"120","slug":"finance","label":"Finance"},{"id":"102127","slug":"up-or-down","label":"Up or Down"}],"synthetic":false,"is_group":false,"group_key":null,"parent_event_id":null,"probability":null,"spread":null,"top_outcome":"","top_outcome_probability":0.65,"top_outcome_prob_24h_change":0.15000000000000002,"top_outcome_volume_24h_change":4947.274084,"updated_at":"2026-06-30T07:30:37.415194Z","fetched_at":"2026-06-30T07:30:37.415194Z","added_at":"2026-06-29T12:08:37.694458Z","url":"https://polymarket.com/event/spx-opens-up-or-down-on-june-30-2026","chart_24h":[0.0,0.0,0.0,0.0,454.67842299999995,454.67842299999995,454.67842299999995,454.67842299999995,454.67842299999995,454.67842299999995,454.67842299999995,454.67842299999995,454.67842299999995,454.67842299999995,454.67842299999995,454.67842299999995,454.67842299999995,454.67842299999995,585.423428,595.423428,605.0154309999999,605.0154309999999,686.8672809999999,686.8672809999999,691.8672809999999,825.0076289999998,1228.8776289999998,1228.8776289999998,1228.8776289999998,1437.9085369999998,1487.9085369999998,3683.0636099999997,3757.230275,3810.066093,3948.697493,4108.847492999999],"markets":[{"source":"polymarket","id":"2729623","event_id":"647577","slug":"spx-opens-up-or-down-on-june-30-2026","question":"S&P 500 (SPX) Opens Up or Down on June 30?","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 30 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 30 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":[0.65,0.35],"probability":0.65,"spread":0.04,"active":true,"closed":false,"start_date":"2026-06-29T12:02:06.038214Z","end_date":"2026-06-30T20:00:00Z","closed_time":null,"volume":4947.274084000001,"volume_24hr":4947.274084,"prob_24h_change":0.15000000000000002,"volume_24h_change":4947.274084,"normalized_vol_24hr":25.140640258789062,"normalized_volume":21.04083251953125,"liquidity":1343.6525,"categories":["Finance"],"countries":[],"updated_at":"2026-06-30T07:31:36.812656Z","fetched_at":"2026-06-30T07:30:37.434058Z","added_at":"2026-06-29T12:08:37.721912Z","url":"https://polymarket.com/event/spx-opens-up-or-down-on-june-30-2026/spx-opens-up-or-down-on-june-30-2026","event_title":"S&P 500 (SPX) Opens Up or Down on June 30?","chart_24h":[0.5,0.69,0.695,0.685,0.485,0.47,0.47,0.46,0.445,0.45,0.44,0.435,0.43,0.47,0.475,0.36,0.49,0.485,0.505,0.535,0.53,0.525,0.515,0.44,0.45,0.495,0.465,0.46,0.485,0.53,0.545,0.715,0.64,0.675,0.615,0.705]}],"_meta":{"attribution":"pdata.world — aggregated prediction-market data across 8 platforms","canonical_url":"https://pdata.world/events/polymarket/647577","as_of":"2026-06-30T07:34:08.790278Z","docs":"https://api.pdata.world/docs","cite_as":"According to pdata.world (tracking Polymarket): \"S&P 500 (SPX) Opens Up or Down on June 30?\" — top market at 65% probability across 1 outcome","source_url":null}}