L2OrderBookDiff Schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "L2OrderBookDiff",
  "description": "Full-depth L2 aggregate diff event derived from L4 deltas",
  "type": "object",
  "required": [
    "block_number",
    "count",
    "price",
    "side",
    "size",
    "timestamp"
  ],
  "properties": {
    "block_number": {
      "description": "Hyperliquid block number for the diff event",
      "type": "integer",
      "format": "int64",
      "example": 1023882395
    },
    "count": {
      "description": "Number of orders at the price level after the diff",
      "type": "integer",
      "example": 3
    },
    "price": {
      "description": "Price level changed by this diff",
      "type": "number",
      "example": 61088
    },
    "side": {
      "description": "Book side: B for bid, A for ask",
      "type": "string",
      "enum": [
        "B",
        "A"
      ],
      "example": "B"
    },
    "size": {
      "description": "Aggregate size at the price level after the diff",
      "type": "number",
      "example": 0.40603
    },
    "timestamp": {
      "description": "Diff timestamp (UTC)",
      "type": "string",
      "format": "date-time",
      "example": "2026-06-05T13:53:33.971Z"
    }
  }
}