{
  "_notice": {
    "type": "free_key_offer",
    "message": "Free and anonymous access is staying. If this endpoint is in your pipeline, a free key adds advance notice before any schema change or deprecation. POST /v1/keys {\"email\": \"you@firm.com\"} — nothing else required. Something broken or missing? hello@clearmarket.fyi reaches a human.",
    "docs": "https://clearmarket.fyi/for-data/",
    "policy": "This field is additive and its shape will not change."
  },
  "event_id": "CM-EVT-YWVP6NQ8Z9",
  "slug": "spx-opens-up-or-down-on-august-4-2026",
  "question": "Will the S&P 500 (SPX) open up on August 4?",
  "category": "financials",
  "event_type": "BINARY",
  "ladder_distribution": null,
  "tags": [
    "financials",
    "spx",
    "finance",
    "market-open",
    "daily-movement",
    "2026"
  ],
  "catalyst_types": [],
  "catalyst_dates": [],
  "editorial_notes": "This market tracks whether the S&P 500 Index opens higher or lower on August 4, 2026. S&P Dow Jones Indices is the authoritative publisher of the official opening print. Only one platform is active here; no cross-platform structural contrast exists. Resolution flows through Polymarket's UMA Optimistic Oracle.",
  "venues_covered": [
    "polymarket"
  ],
  "primary_market_id": "CM-MKT-VYTS3MX3M6",
  "current_primary_mark": {
    "last_price": 0.999,
    "implied_probability": 0.999
  },
  "created_at": "2026-08-04T20:03:51.865287+00:00",
  "updated_at": "2026-08-04T20:03:51.865287+00:00",
  "markets": [
    {
      "market_id": "CM-MKT-VYTS3MX3M6",
      "event_id": "CM-EVT-YWVP6NQ8Z9",
      "platform": "polymarket",
      "platform_market_id": "0xf901d454887e02e84f279bb3c2681d0069d20937af399caf911324cfc7a5508c",
      "question": "S&P 500 (SPX) Opens Up or Down on August 4?",
      "description": "This market will resolve to \"Up\" if the official S&P 500 Index open price for S&P 500 (SPX) on August 4 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 August 4 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 Thur",
      "contract_type": "binary",
      "settlement_currency": "USDC",
      "underlying_reference": "S&P Dow Jones Indices publishes the official S&P 500 Index opening and closing prices for August 4, 2026.",
      "close_at": "2026-08-04T20:00:00Z",
      "resolve_at": "2026-08-04T20:00:00Z",
      "status": "open",
      "resolution": {
        "rules_raw": "This market will resolve to \"Up\" if the official S&P 500 Index open price for S&P 500 (SPX) on August 4 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 August 4 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",
        "arbitration_model": "uma_oracle",
        "proposer": "managed_whitelist",
        "source": "https://www.wsj.com/market-data/stocks",
        "source_status": "platform_named",
        "source_citation": null,
        "sources": [
          {
            "name": "https://www.wsj.com/market-data/stocks",
            "url": null,
            "provenance": "platform_api"
          },
          {
            "name": "wsj.com",
            "url": "https://www.wsj.com/market-data/stocks",
            "provenance": "platform_api"
          },
          {
            "name": "wsj.com",
            "url": "https://www.wsj.com/market-data/stocks/emea",
            "provenance": "platform_api"
          },
          {
            "name": "wsj.com",
            "url": "https://www.wsj.com/market-data/stocks/asia",
            "provenance": "platform_api"
          },
          {
            "name": "Wall Street Journal",
            "url": null,
            "provenance": "clearmarket_editorial"
          },
          {
            "name": "S&P 500 Index",
            "url": null,
            "provenance": "clearmarket_editorial"
          }
        ],
        "source_of_record": "Wall Street Journal",
        "source_mechanism": null,
        "source_type": null,
        "source_quality": null,
        "source_commitment": "named",
        "source_commitment_subtype": "committed_secondhand",
        "source_hedge_text": null
      },
      "rcg": {
        "grade": "C",
        "score": 84,
        "caps": [
          "commitment_committed_secondhand"
        ],
        "applied_factors": 6
      },
      "last_price": 0.999,
      "implied_probability": 0.999,
      "volume_24h_usd": 13417.997522999998,
      "volume_total_usd": 13417.997522999996,
      "settlement_style": "terminal",
      "direction": "occurrence",
      "threshold": null,
      "question_id": "CMX-4B34F9B06A",
      "also_on": null,
      "tags": [
        "500",
        "equity",
        "index",
        "us"
      ],
      "eligibility_screens": null
    }
  ],
  "resolution_log": [],
  "_provenance": {
    "source": "clearmarket.fyi",
    "ref": "CM-EVT-YWVP6NQ8Z9",
    "terms": "Attribution required. clearmarket.fyi"
  }
}