List HIP-4 questions JSON Schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "listHip4Questions query parameters",
  "type": "object",
  "properties": {
    "cursor": {
      "description": "Question ID cursor for pagination.",
      "type": "integer",
      "format": "int64",
      "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": "listHip4Questions response 200",
  "description": "API response containing HIP-4 questions.",
  "type": "object",
  "properties": {
    "data": {
      "type": "array",
      "items": {
        "description": "HIP-4 question: multi-choice resolver that groups N binary outcomes under one ballot. One named outcome per choice plus a fallback outcome that wins when no named choice resolves.",
        "type": "object",
        "required": [
          "description",
          "fallback_outcome_id",
          "first_seen_at",
          "last_updated_at",
          "name",
          "named_outcome_ids",
          "question_id",
          "settled_named_outcomes"
        ],
        "properties": {
          "description": {
            "description": "Pipe-delimited question metadata (class, underlying, expiry, price thresholds, period).",
            "type": "string",
            "example": "class:priceBucket|underlying:BTC|expiry:20260508-0600|priceThresholds:79303,82540|period:1d"
          },
          "fallback_outcome_id": {
            "description": "Outcome ID that resolves Yes when no named outcome does.",
            "type": "integer",
            "format": "int64",
            "example": 6
          },
          "first_seen_at": {
            "description": "When this question was first observed by 0xArchive (UTC).",
            "type": "string",
            "format": "date-time",
            "example": "2026-05-08T05:57:28.326Z"
          },
          "last_updated_at": {
            "description": "When this question row was last updated (UTC).",
            "type": "string",
            "format": "date-time",
            "example": "2026-05-08T05:57:28.326Z"
          },
          "name": {
            "description": "Question name as published on-chain (recurring markets use a generic name such as `Recurring`).",
            "type": "string",
            "example": "Recurring"
          },
          "named_outcome_ids": {
            "description": "Outcome IDs of the named choices grouped under this question.",
            "type": "array",
            "items": {
              "type": "integer",
              "format": "int64"
            },
            "example": [
              7,
              8,
              9
            ]
          },
          "question_id": {
            "description": "Question identifier.",
            "type": "integer",
            "format": "int64",
            "example": 0
          },
          "settled_named_outcomes": {
            "description": "Subset of `named_outcome_ids` that have already settled.",
            "type": "array",
            "items": {
              "type": "integer",
              "format": "int64"
            },
            "example": []
          }
        },
        "additionalProperties": true
      }
    },
    "meta": {
      "description": "Response metadata",
      "type": "object",
      "properties": {
        "count": {
          "description": "Number of records returned",
          "type": "integer"
        },
        "coverage_from": {
          "description": "Earliest coverage for the requested symbol and data type. Present only when the requested window ends before coverage begins.",
          "type": "string",
          "format": "date-time"
        },
        "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
        },
        "notice": {
          "description": "Human-readable advisory about the response. Currently used when the requested window ends before coverage begins for the symbol; may carry other advisories in future.",
          "type": "string"
        },
        "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": "listHip4Questions response 400",
  "description": "Error response",
  "type": "object",
  "properties": {
    "code": {
      "description": "HTTP status code",
      "type": "integer"
    },
    "error": {
      "description": "Error message",
      "type": "string"
    },
    "error_code": {
      "description": "Machine-readable error code. Common values: `invalid_query_params` (a query parameter failed to parse or validate) and `invalid_path_params` (a path parameter failed to parse). Other endpoint-specific codes exist; treat unknown codes as generic errors of the given HTTP status.",
      "type": "string"
    },
    "request_id": {
      "description": "Unique request ID for support",
      "type": "string",
      "format": "uuid"
    }
  }
}

{
  "code": 400,
  "error": "Failed to deserialize query string: limit: invalid digit found in string",
  "error_code": "invalid_query_params",
  "request_id": "3f2a9c71-5b0e-4d68-9a4c-7e1d2b6f8a05"
}

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "listHip4Questions response 401",
  "description": "Error response",
  "type": "object",
  "properties": {
    "code": {
      "description": "HTTP status code",
      "type": "integer"
    },
    "error": {
      "description": "Error message",
      "type": "string"
    },
    "error_code": {
      "description": "Machine-readable error code. Common values: `invalid_query_params` (a query parameter failed to parse or validate) and `invalid_path_params` (a path parameter failed to parse). Other endpoint-specific codes exist; treat unknown codes as generic errors of the given HTTP status.",
      "type": "string"
    },
    "request_id": {
      "description": "Unique request ID for support",
      "type": "string",
      "format": "uuid"
    }
  }
}

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

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "listHip4Questions response 429",
  "description": "Error response",
  "type": "object",
  "properties": {
    "code": {
      "description": "HTTP status code",
      "type": "integer"
    },
    "error": {
      "description": "Error message",
      "type": "string"
    },
    "error_code": {
      "description": "Machine-readable error code. Common values: `invalid_query_params` (a query parameter failed to parse or validate) and `invalid_path_params` (a path parameter failed to parse). Other endpoint-specific codes exist; treat unknown codes as generic errors of the given HTTP status.",
      "type": "string"
    },
    "request_id": {
      "description": "Unique request ID for support",
      "type": "string",
      "format": "uuid"
    }
  }
}

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