BuiltWith Change API Result

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://api.builtwith.com/schemas/change-result",
  "title": "BuiltWith Change API Result",
  "description": "Schema for the BuiltWith Change API response, tracking technology additions and removals with AI-generated business context.",
  "type": "object",
  "properties": {
    "Results": {
      "type": "array",
      "description": "Array of domain change results",
      "items": {
        "$ref": "#/$defs/DomainChanges"
      }
    }
  },
  "required": ["Results"],
  "$defs": {
    "DomainChanges": {
      "type": "object",
      "properties": {
        "Lookup": {
          "type": "string",
          "description": "The queried domain"
        },
        "Changes": {
          "$ref": "#/$defs/ChangeSet"
        }
      },
      "required": ["Lookup"]
    },
    "ChangeSet": {
      "type": "object",
      "properties": {
        "since_utc": {
          "type": "string",
          "format": "date-time",
          "description": "Start of the detection window"
        },
        "last_checked_utc": {
          "type": "string",
          "format": "date-time",
          "description": "Most recent crawl timestamp"
        },
        "summary": {
          "type": "string",
          "description": "AI-generated overview of technology additions and removals"
        },
        "events": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/ChangeEvent"
          }
        }
      }
    },
    "ChangeEvent": {
      "type": "object",
      "description": "A single technology change event",
      "properties": {
        "type": {
          "type": "string",
          "enum": ["technology_added", "technology_removed"],
          "description": "Direction of the technology change"
        },
        "technology": {
          "type": "string",
          "description": "Name of the technology that changed"
        },
        "category": {
          "type": "array",
          "items": { "type": "string" },
          "description": "BuiltWith category labels for the technology"
        },
        "tag": {
          "type": "string",
          "description": "Primary technology tag"
        },
        "first_seen_utc": {
          "type": "string",
          "format": "date-time",
          "description": "When the addition was first detected"
        },
        "last_seen_utc": {
          "type": "string",
          "format": "date-time",
          "description": "When the removal was last detected"
        },
        "importance": {
          "type": "string",
          "enum": ["low", "medium", "high"],
          "description": "Significance level of the change"
        },
        "why_this_matters": {
          "type": "string",
          "description": "AI-generated explanation of the business significance"
        }
      },
      "required": ["type", "technology"]
    }
  }
}