{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://api-evangelist.github.io/deribit/json-schema/book_summary.json",
  "title": "Book Summary",
  "properties": {
    "instrument_name": {
      "$ref": "#/components/schemas/instrument_name"
    },
    "high": {
      "example": 7022.89,
      "type": "number",
      "description": "Price of the 24h highest trade"
    },
    "low": {
      "example": 7022.89,
      "type": "number",
      "description": "Price of the 24h lowest trade, `null` if there weren't any trades"
    },
    "base_currency": {
      "example": "ETH",
      "type": "string",
      "description": "Base currency"
    },
    "quote_currency": {
      "example": "USD",
      "type": "string",
      "description": "Quote currency"
    },
    "volume": {
      "example": 223,
      "type": "number",
      "description": "The total 24h traded volume (in base currency)"
    },
    "bid_price": {
      "example": 7022.89,
      "type": "number",
      "description": "The current best bid price, `null` if there aren't any bids"
    },
    "ask_price": {
      "example": 7022.89,
      "type": "number",
      "description": "The current best ask price, `null` if there aren't any asks"
    },
    "mid_price": {
      "example": 7022.89,
      "type": "number",
      "description": "The average of the best bid and ask, `null` if there aren't any asks or bids"
    },
    "mark_price": {
      "example": 7022.89,
      "type": "number",
      "description": "The current instrument market price"
    },
    "last": {
      "example": 7022.89,
      "type": "number",
      "description": "The price of the latest trade, `null` if there weren't any trades"
    },
    "open_interest": {
      "example": 0.5,
      "type": "number",
      "description": "Optional (only for derivatives). The total amount of outstanding contracts in the corresponding amount units. For perpetual and inverse futures the amount is in USD units. For options and linear futures it is the underlying base currency coin."
    },
    "creation_timestamp": {
      "$ref": "#/components/schemas/timestamp"
    },
    "estimated_delivery_price": {
      "example": 11628.81,
      "type": "number",
      "description": "Optional (only for derivatives). Estimated delivery price for the market."
    },
    "volume_usd": {
      "type": "number",
      "description": "Volume in USD"
    },
    "volume_notional": {
      "type": "number",
      "description": "Volume in quote currency (futures and spots only)"
    },
    "current_funding": {
      "type": "number",
      "example": 0.12344,
      "description": "Current funding (perpetual only)"
    },
    "funding_8h": {
      "type": "number",
      "description": "Funding 8h (perpetual only)"
    },
    "mark_iv": {
      "$ref": "#/components/schemas/mark_iv"
    },
    "interest_rate": {
      "example": 0,
      "type": "number",
      "description": "Interest rate used in implied volatility calculations (options only)"
    },
    "underlying_index": {
      "example": "index_price",
      "type": "string",
      "description": "Name of the underlying future, or `'index_price'` (options only)"
    },
    "underlying_price": {
      "example": 6745.34,
      "type": "number",
      "description": "underlying price for implied volatility calculations (options only)"
    },
    "price_change": {
      "example": 10.23,
      "type": "number",
      "description": "24-hour price change expressed as a percentage, `null` if there weren't any trades"
    }
  },
  "required": [
    "instrument_name",
    "high",
    "low",
    "base_currency",
    "quote_currency",
    "volume",
    "bid_price",
    "ask_price",
    "mid_price",
    "mark_price",
    "last",
    "open_interest",
    "creation_timestamp"
  ],
  "type": "object"
}