List HIP-4 outcomes

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "listHip4Outcomes query parameters",
  "type": "object",
  "properties": {
    "is_settled": {
      "description": "Filter by settlement status. Omit to return both live and settled outcomes.",
      "type": "boolean",
      "x-parameter-location": "query"
    },
    "cursor": {
      "description": "Cursor for pagination (use the value from previous response's `next_cursor`)",
      "type": "string",
      "x-parameter-location": "query"
    },
    "limit": {
      "description": "Maximum number of results (default: 100, max: 1000)",
      "type": "integer",
      "default": 100,
      "maximum": 1000,
      "x-parameter-location": "query"
    }
  }
}

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "listHip4Outcomes response 200",
  "description": "API response wrapping an array of HIP-4 outcome aggregates (without `aggregated_oi`; use `/outcomes/{outcome_id}` for the detail variant)",
  "type": "object",
  "properties": {
    "data": {
      "type": "array",
      "items": {
        "description": "Per-outcome aggregate (both sides combined). Returned by `/outcomes` (list, without `aggregated_oi`) and `/outcomes/{outcome_id}` (detail, with `aggregated_oi` populated).",
        "type": "object",
        "required": [
          "is_settled",
          "outcome_id",
          "side_specs"
        ],
        "properties": {
          "aggregated_oi": {
            "description": "Display/paired/parity OI aggregates. Populated ONLY on the `/outcomes/{outcome_id}` detail response. Omitted (or null) on the `/outcomes` list response.",
            "nullable": true,
            "allOf": [
              {
                "description": "Derived OI display fields combining both sides of a HIP-4 outcome. Currency is always `USDH` (Hyperliquid's stablecoin). Only populated on `/outcomes/{outcome_id}` (detail), NOT on `/outcomes` (list).",
                "type": "object",
                "required": [
                  "currency"
                ],
                "properties": {
                  "as_of": {
                    "description": "Latest timestamp across both sides",
                    "type": "string",
                    "format": "date-time",
                    "nullable": true,
                    "example": "2026-05-02T20:27:21Z"
                  },
                  "currency": {
                    "description": "Notional currency. Always `USDH` for HIP-4.",
                    "type": "string",
                    "enum": [
                      "USDH"
                    ],
                    "example": "USDH"
                  },
                  "outcome_display_open_interest_contracts": {
                    "description": "Display total: sum of side0 + side1 OI contracts. Use this for outcome-level OI dashboards.",
                    "type": "number",
                    "nullable": true,
                    "example": 1136096
                  },
                  "paired_set_supply_contracts": {
                    "description": "Paired-set supply: minimum of side0 and side1 OI contracts. Represents the count of fully collateralized Yes+No pairs in circulation.",
                    "type": "number",
                    "nullable": true,
                    "example": 568048
                  },
                  "side0_as_of": {
                    "description": "Timestamp of the side 0 OI sample",
                    "type": "string",
                    "format": "date-time",
                    "nullable": true,
                    "example": "2026-05-02T20:27:21Z"
                  },
                  "side0_open_interest_contracts": {
                    "description": "Latest open-interest contracts for side 0 (Yes)",
                    "type": "number",
                    "nullable": true,
                    "example": 568048
                  },
                  "side1_as_of": {
                    "description": "Timestamp of the side 1 OI sample",
                    "type": "string",
                    "format": "date-time",
                    "nullable": true,
                    "example": "2026-05-02T20:27:21Z"
                  },
                  "side1_open_interest_contracts": {
                    "description": "Latest open-interest contracts for side 1 (No)",
                    "type": "number",
                    "nullable": true,
                    "example": 568048
                  },
                  "side_supply_parity": {
                    "description": "True when side0 OI equals side1 OI within tolerance. Parity should hold for binary outcomes; a sustained false value indicates ingestion drift.",
                    "type": "boolean",
                    "nullable": true,
                    "example": true
                  }
                }
              }
            ]
          },
          "class": {
            "description": "Outcome class (e.g., `priceBinary`)",
            "type": "string",
            "nullable": true,
            "example": "priceBinary"
          },
          "description_raw": {
            "description": "Pipe-delimited recurring-market metadata as emitted upstream",
            "type": "string",
            "nullable": true,
            "example": "class:priceBinary|underlying:BTC|expiry:20260503-0600|targetPrice:78213|period:1d"
          },
          "expiry": {
            "description": "Settlement timestamp (UTC)",
            "type": "string",
            "format": "date-time",
            "nullable": true,
            "example": "2026-05-03T06:00:00Z"
          },
          "is_settled": {
            "description": "Whether the outcome has settled",
            "type": "boolean",
            "example": false
          },
          "name": {
            "description": "Human-readable outcome name (without per-side suffix)",
            "type": "string",
            "nullable": true,
            "example": "BTC ≥ 78213 by 2026-05-03 06:00 UTC"
          },
          "outcome_id": {
            "description": "Numeric outcome identifier",
            "type": "integer",
            "format": "int64",
            "example": 0
          },
          "period": {
            "description": "Cadence of the recurring market (e.g., `1d`, `1h`)",
            "type": "string",
            "nullable": true,
            "example": "1d"
          },
          "side_specs": {
            "description": "Per-side specs. Typically two elements: side 0 (Yes) and side 1 (No).",
            "type": "array",
            "items": {
              "description": "Per-side spec nested in `Hip4OutcomeAggregate.side_specs`. One element per side (typically two: side 0 = Yes, side 1 = No).",
              "type": "object",
              "required": [
                "asset_id",
                "coin",
                "name",
                "side"
              ],
              "properties": {
                "asset_id": {
                  "description": "Public asset ID for this side",
                  "type": "integer",
                  "format": "int64",
                  "example": 100000000
                },
                "coin": {
                  "description": "Coin identifier for this side. Returned in `#`-prefixed form. REST paths accept either the bare numeric id (e.g. `0`) or the `#`-prefixed form (e.g. `#0`).",
                  "type": "string",
                  "example": "#0"
                },
                "name": {
                  "description": "Human label for this side",
                  "type": "string",
                  "example": "Yes"
                },
                "side": {
                  "description": "Side index: 0 = Yes, 1 = No",
                  "type": "integer",
                  "enum": [
                    0,
                    1
                  ],
                  "example": 0
                }
              }
            }
          },
          "source_seen_at": {
            "description": "Last time the outcome was seen upstream",
            "type": "string",
            "format": "date-time",
            "nullable": true,
            "example": "2026-05-02T20:25:00Z"
          },
          "status": {
            "description": "Lifecycle status (`live`, `settled`, ...)",
            "type": "string",
            "nullable": true,
            "example": "live"
          },
          "target_price": {
            "description": "Target price for the binary outcome",
            "type": "number",
            "nullable": true,
            "example": 78213
          },
          "underlying": {
            "description": "Underlying asset for recurring price-binary outcomes",
            "type": "string",
            "nullable": true,
            "example": "BTC"
          }
        }
      }
    },
    "meta": {
      "description": "Response metadata",
      "type": "object",
      "properties": {
        "count": {
          "description": "Number of records returned",
          "type": "integer"
        },
        "next_cursor": {
          "description": "Cursor for pagination (timestamp). Use this value as the `cursor` parameter to fetch the next page of results.",
          "type": "string",
          "nullable": true
        },
        "request_id": {
          "description": "Unique request ID for support",
          "type": "string",
          "format": "uuid"
        }
      }
    },
    "success": {
      "type": "boolean",
      "example": true
    }
  }
}

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "listHip4Outcomes response 400",
  "description": "Error response",
  "type": "object",
  "properties": {
    "code": {
      "description": "HTTP status code",
      "type": "integer"
    },
    "error": {
      "description": "Error message",
      "type": "string"
    }
  }
}

{
  "code": 400,
  "error": "Invalid request parameters"
}

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "listHip4Outcomes response 401",
  "description": "Error response",
  "type": "object",
  "properties": {
    "code": {
      "description": "HTTP status code",
      "type": "integer"
    },
    "error": {
      "description": "Error message",
      "type": "string"
    }
  }
}

{
  "code": 401,
  "error": "Missing or invalid API key. Provide X-API-Key header."
}

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "listHip4Outcomes response 429",
  "description": "Error response",
  "type": "object",
  "properties": {
    "code": {
      "description": "HTTP status code",
      "type": "integer"
    },
    "error": {
      "description": "Error message",
      "type": "string"
    }
  }
}

{
  "code": 429,
  "error": "Rate limit exceeded"
}