{"source":"polymarket","id":"537749","ticker":"spx-opens-up-or-down-on-june-1-2026","slug":"spx-opens-up-or-down-on-june-1-2026","title":"S&P 500 (SPX) Opens Up or Down on June 1?","description":"This market will resolve to \"Up\" if the official S&P 500 Index open price for S&P 500 (SPX) on June 1 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 1 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":"2026-05-29T12:13:17.418726Z","end_date":"2026-06-01T20:00:00Z","closed_time":null,"volume":1482.225351,"volume_24hr":1482.225351,"volume_24h_change":null,"normalized_vol_24hr":16.948974609375,"normalized_volume":12.097877502441406,"liquidity":595.6363,"open_interest":1243.0,"categories":["Finance"],"tags":[{"id":"102683","slug":"spx","label":"SPX"},{"id":"102682","slug":"indicies","label":"Indicies"},{"id":"120","slug":"finance","label":"Finance"},{"id":"102169","slug":"hide-from-new","label":"Hide From New"},{"id":"102127","slug":"up-or-down","label":"Up or Down"},{"id":"102281","slug":"daily","label":"Daily"},{"id":"104181","slug":"rewards-automation-400-4pt5-50-1","label":"Rewards Automation 400, 4.5, 50 (1)"}],"synthetic":false,"is_group":false,"group_key":null,"parent_event_id":null,"probability":null,"spread":null,"top_outcome":"","top_outcome_probability":0.555,"top_outcome_prob_24h_change":-0.06499999999999995,"top_outcome_volume_24h_change":1482.225351,"updated_at":"2026-05-31T08:38:22.132592Z","fetched_at":"2026-05-31T08:38:22.132592Z","added_at":"2026-05-29T16:22:31.481149Z","url":"https://polymarket.com/event/spx-opens-up-or-down-on-june-1-2026","chart_24h":[0.0,200.0,200.0,200.0,200.0,200.0,200.0,205.0,210.0,210.0,210.0,210.0,239.225351,439.225351,639.225351,639.225351,639.225351,639.225351,639.225351,639.225351,849.225351,849.225351,849.225351,879.225351,1084.225351,1084.225351,1477.225351,1477.225351,1477.225351,1477.225351,1477.225351,1477.225351],"markets":[{"source":"polymarket","id":"2385780","event_id":"537749","slug":"spx-opens-up-or-down-on-june-1-2026","question":"S&P 500 (SPX) Opens Up or Down on June 1?","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 1 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 1 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":[0.555,0.445],"probability":0.555,"spread":0.05,"active":true,"closed":false,"start_date":"2026-05-29T12:02:38.820410Z","end_date":"2026-06-01T20:00:00Z","closed_time":null,"volume":1482.225351,"volume_24hr":1482.225351,"prob_24h_change":-0.06499999999999995,"volume_24h_change":1482.225351,"normalized_vol_24hr":17.607072830200195,"normalized_volume":15.643315315246582,"liquidity":595.6363,"categories":["Finance"],"updated_at":"2026-05-31T08:25:06.192326Z","fetched_at":"2026-05-31T08:24:03.932336Z","added_at":"2026-05-29T16:22:31.560808Z","url":"https://polymarket.com/event/spx-opens-up-or-down-on-june-1-2026/spx-opens-up-or-down-on-june-1-2026","event_title":"S&P 500 (SPX) Opens Up or Down on June 1?","chart_24h":[0.62,0.62,0.62,0.62,0.62,0.63,0.635,0.635,0.655,0.635,0.645,0.645,0.645,0.575,0.54,0.55,0.54,0.54,0.545,0.565,0.55,0.565,0.57,0.535,0.5,0.495,0.48,0.48,0.48]}],"_meta":{"attribution":"pdata.world — aggregated prediction-market data across 8 platforms","canonical_url":"https://pdata.world/events/polymarket/537749","as_of":"2026-05-31T08:48:50.106191Z","docs":"https://api.pdata.world/docs","cite_as":"According to pdata.world (tracking Polymarket): \"S&P 500 (SPX) Opens Up or Down on June 1?\" — top market at 56% probability across 1 outcome","source_url":null}}