{"source":"polymarket","id":"687691","ticker":"spx-opens-up-or-down-on-july-13-2026","slug":"spx-opens-up-or-down-on-july-13-2026","title":"S&P 500 (SPX) Opens Up or Down on July 13?","description":"This market will resolve to \"Up\" if the official S&P 500 Index open price for S&P 500 (SPX) on July 13 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 13 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":"2026-07-10T12:00:14Z","end_date":"2026-07-13T20:00:00Z","closed_time":null,"volume":3553.5531410000003,"volume_24hr":3033.537616,"volume_24h_change":null,"normalized_vol_24hr":21.1765193939209,"normalized_volume":13.611432075500488,"liquidity":1967.9984,"open_interest":1184.719878,"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":0.19,"top_outcome_prob_24h_change":-0.15499999999999997,"top_outcome_volume_24h_change":2513.522091,"updated_at":"2026-07-13T02:33:21.955701Z","fetched_at":"2026-07-13T02:33:21.955701Z","added_at":"2026-07-10T12:10:44.656165Z","url":"https://polymarket.com/event/spx-opens-up-or-down-on-july-13-2026","chart_24h":[520.015525,520.015525,520.015525,520.015525,584.015525,584.015525,577.893078,577.893078,568.668943,568.668943,568.668943,568.668943,728.668943,728.668943,728.668943,708.568943,714.149979,694.049979,717.859501,722.859501,674.238813,674.238813,583.238813,543.238813,543.238813,538.15407,562.072987,1472.2440330000002,1567.154033,1455.524273,1764.79688,1836.79688,3033.537616],"markets":[{"source":"polymarket","id":"2869592","event_id":"687691","slug":"spx-opens-up-or-down-on-july-13-2026","question":"S&P 500 (SPX) Opens Up or Down on July 13?","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 13 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 13 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":[0.19,0.81],"probability":0.19,"spread":0.02,"active":true,"closed":false,"start_date":"2026-07-10T12:00:14Z","end_date":"2026-07-13T20:00:00Z","closed_time":null,"volume":3553.5531410000003,"volume_24hr":3033.537616,"prob_24h_change":-0.15499999999999997,"volume_24h_change":2513.522091,"normalized_vol_24hr":22.8938045501709,"normalized_volume":18.74970817565918,"liquidity":1820.8446,"categories":["Finance"],"countries":[],"updated_at":"2026-07-13T02:05:43.287265Z","fetched_at":"2026-07-13T02:04:35.618229Z","added_at":"2026-07-10T12:10:44.710273Z","url":"https://polymarket.com/event/spx-opens-up-or-down-on-july-13-2026/spx-opens-up-or-down-on-july-13-2026","event_title":"S&P 500 (SPX) Opens Up or Down on July 13?","chart_24h":[0.36,0.35,0.405,0.425,0.42,0.385,0.39,0.39,0.39,0.39,0.335,0.335,0.38,0.43,0.405,0.4,0.355,0.35,0.4,0.4,0.405,0.37,0.36,0.355,0.35,0.39,0.39,0.265,0.285,0.305,0.27,0.23,0.19]}],"_meta":{"attribution":"pdata.world — aggregated prediction-market data across 8 platforms","canonical_url":"https://pdata.world/events/polymarket/687691","as_of":"2026-07-13T02:33:37.062453Z","docs":"https://api.pdata.world/docs","cite_as":"According to pdata.world (tracking Polymarket): \"S&P 500 (SPX) Opens Up or Down on July 13?\" — top market at 19% probability across 1 outcome","source_url":null}}