結論:首先说结论 — 暗号資産トレーディングにおいて複数取引所のOrder Bookをリアルタイムで統合分析したいなら、HolySheep AIの強みを活かした「Tardis + HolySheep」アーキテクチャが最適です。公式API比85%のコスト削減、¥1=$1の固定レート、<50msのレイテンシで、本番環境でも安心して運用できます。

本記事の目的と対象読者

本ガイドでは、暗号資産取引所の_tick data_を提供するTardisとHolySheep AIを組み合わせ、多取引所のTimestamp归一化とOrder Bookマージを実装する方法を実践的に解説します。

向いている人・向いていない人

✅ 向いている人

❌ 向いていない人

価格とROI

Provider 価格モデル 1BTC約$70,000時 月間コスト試算 TTM(Thumb-to-Market) 対応通貨 決済手段
HolySheep AI ¥1=$1(公式¥7.3比85%節約) GPT-4.1: $8/MTok、Claude Sonnet 4.5: $15/MTok、Gemini 2.5 Flash: $2.50/MTok、DeepSeek V3.2: $0.42/MTok <50ms WeChat Pay、Alipay、USDT、他 多通貨対応・日本語対応
公式 OpenAI API GPT-4o: $5/MTok(入力)、$15/MTok(出力) 同上基準で計算 100-300ms USDのみ クレジットカード
公式 Anthropic API Claude 3.5 Sonnet: $3/MTok(入力)、$15/MTok(出力) 同上基準で計算 80-200ms USDのみ クレジットカード
Tardis(Market Data専用) €99/月〜(Basic)、€499/月〜(Pro) 約$107〜$539/月 <10ms(原生) EUR クレジットカード、Wire

HolySheep ROI 分析

Tardisとは?多取引所データ取得の課題

Tardis(https://tardis.dev)は、板情報(Order Book)、約定履歴(Trade)、狼狽売(Settlement)などのMarket Dataを複数の暗号資産取引所から提供するSaaSです。

Tardisの主要機能

多取引所データ統合の3大課題

  1. タイムスタンプの不整合: 各取引所がUTC、Unix timestamp、JSTなど異なる時刻系を使用
  2. Order Book構造の多様性: 取引所に依存するPrice Level、Bid/Askの順序違い
  3. ネットワークレイテンシ: 分散されたサーバーからのデータ到着順序の保証なし

HolySheep AIを選ぶ理由

HolySheep AI(HolySheep AI)は、上記の課題を解決するために最適化されたLLM API統合プラットフォームです。

機能 HolySheep AI 競合サービス
レート ¥1=$1(公式比85%節約) 公式APIR比高价
レイテンシ <50ms 100-300ms
決済 WeChat Pay / Alipay / USDT対応 クレジットカードのみ
対応モデル GPT-4.1、Claude Sonnet 4.5、Gemini 2.5 Flash、DeepSeek V3.2 单一或有限
日本語対応 完全対応 限定或不対応
Free Credits 登録時付与 なし

実践編:Tardis + HolySheepで跨所Order Book統合

全体アーキテクチャ

┌─────────────────────────────────────────────────────────────────┐
│                    システム全体構成                                │
├─────────────────────────────────────────────────────────────────┤
│                                                                  │
│  ┌──────────────┐    WebSocket     ┌──────────────────────────┐ │
│  │   Tardis     │ ──────────────► │    Data Normalizer       │ │
│  │  (Market)    │    raw stream    │  - Timestamp归一化       │ │
│  └──────────────┘                  │  - Order Book構造统一   │ │
│                                     └───────────┬──────────────┘ │
│                                                 │                 │
│                                                 ▼                 │
│                                     ┌──────────────────────────┐ │
│                                     │   HolySheep AI LLM       │ │
│                                     │  - Arbitrage機会検知     │ │
│                                     │  - 異常値検知           │ │
│                                     │  - トレンド分析         │ │
│                                     └───────────┬──────────────┘ │
│                                                 │                 │
│                                                 ▼                 │
│                                     ┌──────────────────────────┐ │
│                                     │   Trading Bot / Alert    │ │
│                                     │  - 自動执行              │ │
│                                     │  - LINE/Slack通知       │ │
│                                     └──────────────────────────┘ │
└─────────────────────────────────────────────────────────────────┘

Step 1: Tardisからのリアルタイムデータ取得


"""
Tardis WebSocketリアルタイムストリームからOrder Bookデータを取得
https://docs.tardis.dev/docs/websocket
"""

import asyncio
import json
from datetime import datetime, timezone
from typing import Dict, List, Optional
import websockets
from dataclasses import dataclass, field
from sortedcontainers import SortedDict

@dataclass
class NormalizedOrderBook:
    """归一化後のOrder Book"""
    exchange: str
    symbol: str
    timestamp: datetime
    bids: List[tuple[float, float]]  # (price, size)
    asks: List[tuple[float, float]]
    best_bid: float = 0.0
    best_ask: float = 0.0
    spread: float = 0.0
    spread_pct: float = 0.0

@dataclass
class RawTardisMessage:
    """Tardisからの生メッセージ"""
    type: str
    exchange: str
    data: dict
    timestamp: float = field(default_factory=lambda: datetime.now(timezone.utc).timestamp())

class TardisOrderBookFetcher:
    """TardisからリアルタイムOrder Bookデータを取得"""
    
    EXCHANGES = ['binance', 'bybit', 'okx', 'bitget']
    SYMBOLS = ['BTC-USDT', 'ETH-USDT']
    
    def __init__(self, api_key: str):
        self.api_key = api_key
        self.order_books: Dict[str, Dict[str, SortedDict]] = {}
        self.last_messages: Dict[str, dict] = {}
    
    async def connect(self, exchanges: List[str] = None, symbols: List[str] = None):
        """Tardis WebSocketに接続"""
        exchanges = exchanges or self.EXCHANGES
        symbols = symbols or self.SYMBOLS
        
        # Tardis WebSocket URL構築
        channels = []
        for symbol in symbols:
            for exchange in exchanges:
                channels.append(f"{exchange}:{symbol.replace('-', '')}")
        
        ws_url = f"wss://stream.tardis.dev/v1/ws?channels={','.join(channels)}&key={self.api_key}"
        
        print(f"[Tardis] Connecting to: {ws_url[:80]}...")
        
        async with websockets.connect(ws_url) as ws:
            print(f"[Tardis] Connected to {len(channels)} channels")
            
            # 初期订阅確認メッセージ
            subscribe_msg = {
                "type": "subscribe",
                "channels": channels
            }
            await ws.send(json.dumps(subscribe_msg))
            
            async for message in ws:
                await self._process_message(message)
    
    async def _process_message(self, raw_message: str):
        """メッセージの処理と正規化"""
        try:
            msg = json.loads(raw_message)
            msg_type = msg.get('type', '')
            
            if msg_type == 'book':
                await self._handle_orderbook_snapshot(msg)
            elif msg_type == 'book_update':
                await self._handle_orderbook_update(msg)
            elif msg_type == 'trade':
                await self._handle_trade(msg)
                
        except json.JSONDecodeError as e:
            print(f"[Error] JSON decode failed: {e}")
        except Exception as e:
            print(f"[Error] Message processing failed: {e}")
    
    async def _handle_orderbook_snapshot(self, msg: dict):
        """板情報のスナップショット処理"""
        exchange = msg.get('exchange', '')
        symbol = msg.get('symbol', '')
        data = msg.get('data', {})
        
        # Timestamp归一化:すべてUTCに変換
        ts_ms = data.get('timestamp', 0) or data.get('ts', 0)
        normalized_ts = datetime.fromtimestamp(
            ts_ms / 1000 if ts_ms > 1e10 else ts_ms,
            tz=timezone.utc
        )
        
        bids = SortedDict(lambda x: -x)  # 降順
        asks = SortedDict()  # 昇順
        
        for bid in data.get('bids', []):
            price, size = float(bid[0]), float(bid[1])
            if size > 0:
                bids[price] = size
        
        for ask in data.get('asks', []):
            price, size = float(ask[0]), float(ask[1])
            if size > 0:
                asks[price] = size
        
        key = f"{exchange}:{symbol}"
        self.order_books[key] = {'bids': bids, 'asks': asks}
        self.last_messages[key] = {'timestamp': normalized_ts, 'type': 'snapshot'}
    
    async def _handle_orderbook_update(self, msg: dict):
        """板情報の差分更新処理"""
        exchange = msg.get('exchange', '')
        symbol = msg.get('symbol', '')
        data = msg.get('data', {})
        
        key = f"{exchange}:{symbol}"
        if key not in self.order_books:
            return
        
        bids = self.order_books[key]['bids']
        asks = self.order_books[key]['asks']
        
        # Bid更新
        for bid in data.get('bids', []):
            price, size = float(bid[0]), float(bid[1])
            if size == 0:
                bids.pop(price, None)
            else:
                bids[price] = size
        
        # Ask更新
        for ask in data.get('asks', []):
            price, size = float(ask[0]), float(ask[1])
            if size == 0:
                asks.pop(price, None)
            else:
                asks[price] = size
        
        # Timestamp更新
        ts_ms = data.get('timestamp', 0) or data.get('ts', 0)
        normalized_ts = datetime.fromtimestamp(
            ts_ms / 1000 if ts_ms > 1e10 else ts_ms,
            tz=timezone.utc
        )
        self.last_messages[key] = {'timestamp': normalized_ts, 'type': 'update'}
    
    def get_normalized_book(self, exchange: str, symbol: str) -> Optional[NormalizedOrderBook]:
        """ 정규화된Order Bookを取得 """
        key = f"{exchange}:{symbol}"
        if key not in self.order_books:
            return None
        
        book_data = self.order_books[key]
        msg_data = self.last_messages.get(key, {})
        
        bids = book_data['bids']
        asks = book_data['asks']
        
        best_bid = bids.keys()[0] if len(bids) > 0 else 0.0
        best_ask = asks.keys()[0] if len(asks) > 0 else 0.0
        spread = best_ask - best_bid
        spread_pct = (spread / best_ask * 100) if best_ask > 0 else 0.0
        
        return NormalizedOrderBook(
            exchange=exchange,
            symbol=symbol,
            timestamp=msg_data.get('timestamp', datetime.now(timezone.utc)),
            bids=[(p, bids[p]) for p in list(bids.keys())[:20]],
            asks=[(p, asks[p]) for p in list(asks.keys())[:20]],
            best_bid=best_bid,
            best_ask=best_ask,
            spread=spread,
            spread_pct=spread_pct
        )

使用例

async def main(): fetcher = TardisOrderBookFetcher(api_key="YOUR_TARDIS_API_KEY") await fetcher.connect( exchanges=['binance', 'bybit'], symbols=['BTC-USDT'] ) if __name__ == "__main__": asyncio.run(main())

Step 2: HolySheep AIでArbitrage機会を分析


"""
HolySheep AI APIを使用して跨所Arbitrage機会を分析
Base URL: https://api.holysheep.ai/v1
"""

import asyncio
import json
import os
from typing import List, Dict, Optional
from dataclasses import dataclass
from datetime import datetime, timezone
import aiohttp
from tenacity import retry, stop_after_attempt, wait_exponential

HolySheep API設定

HOLYSHEEP_BASE_URL = "https://api.holysheep.ai/v1" HOLYSHEEP_API_KEY = os.getenv("HOLYSHEEP_API_KEY", "YOUR_HOLYSHEEP_API_KEY") @dataclass class ArbitrageOpportunity: """裁定取引機会""" buy_exchange: str sell_exchange: str symbol: str buy_price: float sell_price: float profit_pct: float potential_volume: float estimated_profit_usdt: float timestamp: datetime confidence: float # 信頼度 0-1 @dataclass class HolySheepResponse: """HolySheep API応答""" content: str usage: dict latency_ms: float class HolySheepLLMClient: """HolySheep AI LLM APIクライアント""" def __init__(self, api_key: str): self.api_key = api_key self.base_url = HOLYSHEEP_BASE_URL @retry(stop=stop_after_attempt(3), wait=wait_exponential(multiplier=1, min=1, max=10)) async def analyze_arbitrage( self, order_books: List[dict], symbol: str ) -> HolySheepResponse: """ HolySheep AI APIでArbitrage機会を分析 Args: order_books: 正規化されたOrder Bookデータリスト symbol: 取引ペア(例:BTC-USDT) Returns: Arbitrage分析結果 """ headers = { "Authorization": f"Bearer {self.api_key}", "Content-Type": "application/json" } # プロンプト構築 system_prompt = """あなたは暗号資産取引所の裁定取引(Arbitrage)分析 전문가입니다。 以下の複数取引所のOrder Bookデータを分析し、Arbitrage機会を提案してください。 分析項目: 1. 最高買値(Best Bid)と最高売値(Best Ask)の取引所特定 2. 裁定取引可能額を計算 3. 取引手数料を差し引いた純利益を算出 4. リスク要因(流動性、板の厚み)を評価 必ず以下のJSON形式で返答してください: { "opportunities": [ { "buy_exchange": "購入先取引所", "sell_exchange": "売却先取引所", "buy_price": 数値, "sell_price": 数値, "profit_pct": 数値, "potential_volume": 推奨取引量, "estimated_profit_usdt": 推定利益, "confidence": 0.0-1.0, "risk_factors": ["リスク1", "リスク2"] } ], "market_summary": "市場概要" }""" user_prompt = f"以下の{symbol} Order Bookデータを分析してください:\n\n" for book in order_books: user_prompt += f""" === {book['exchange'].upper()} === Best Bid: ${book['best_bid']:.2f} (size: {book.get('bid_size', 'N/A')}) Best Ask: ${book['best_ask']:.2f} (size: {book.get('ask_size', 'N/A')}) Spread: {book.get('spread_pct', 0):.4f}% Timestamp: {book.get('timestamp', 'N/A')} """ payload = { "model": "gpt-4.1", # $8/MTok - HolySheep価格 "messages": [ {"role": "system", "content": system_prompt}, {"role": "user", "content": user_prompt} ], "temperature": 0.3, "response_format": {"type": "json_object"} } start_time = asyncio.get_event_loop().time() async with aiohttp.ClientSession() as session: async with session.post( f"{self.base_url}/chat/completions", headers=headers, json=payload, timeout=aiohttp.ClientTimeout(total=10) ) as response: if response.status != 200: error_text = await response.text() raise Exception(f"HolySheep API Error: {response.status} - {error_text}") data = await response.json() latency_ms = (asyncio.get_event_loop().time() - start_time) * 1000 content = data['choices'][0]['message']['content'] usage = data.get('usage', {}) return HolySheepResponse( content=content, usage=usage, latency_ms=latency_ms ) async def analyze_with_deepseek( self, order_books: List[dict], symbol: str ) -> HolySheepResponse: """ DeepSeek V3.2モデルを使用($0.42/MTok - 最も安価) """ headers = { "Authorization": f"Bearer {self.api_key}", "Content-Type": "application/json" } user_prompt = f"Analyze {symbol} for arbitrage opportunities from these order books:\n" for book in order_books: user_prompt += f"- {book['exchange']}: Bid {book['best_bid']}, Ask {book['best_ask']}\n" payload = { "model": "deepseek-v3.2", # $0.42/MTok "messages": [ {"role": "user", "content": user_prompt} ], "temperature": 0.2 } start_time = asyncio.get_event_loop().time() async with aiohttp.ClientSession() as session: async with session.post( f"{self.base_url}/chat/completions", headers=headers, json=payload, timeout=aiohttp.ClientTimeout(total=10) ) as response: data = await response.json() latency_ms = (asyncio.get_event_loop().time() - start_time) * 1000 return HolySheepResponse( content=data['choices'][0]['message']['content'], usage=data.get('usage', {}), latency_ms=latency_ms ) class CrossExchangeArbitrageAnalyzer: """跨所裁定取引アナライザー""" def __init__(self, holy_sheep_client: HolySheepLLMClient): self.client = holy_sheep_client self.opportunities: List[ArbitrageOpportunity] = [] async def analyze_opportunities( self, normalized_books: List[dict] ) -> List[ArbitrageOpportunity]: """ 全取引所のOrder BookからArbitrage機会を分析 Args: normalized_books: NormalizedOrderBookの辞書リスト Returns: 検出された裁定取引機会リスト """ if len(normalized_books) < 2: return [] symbol = normalized_books[0]['symbol'] # HolySheep AIで分析 response = await self.client.analyze_arbitrage(normalized_books, symbol) print(f"[HolySheep] Response received in {response.latency_ms:.2f}ms") print(f"[HolySheep] Usage: {response.usage}") # 応答をパース try: result = json.loads(response.content) opportunities = [] for opp in result.get('opportunities', []): arp = ArbitrageOpportunity( buy_exchange=opp['buy_exchange'], sell_exchange=opp['sell_exchange'], symbol=symbol, buy_price=opp['buy_price'], sell_price=opp['sell_price'], profit_pct=opp['profit_pct'], potential_volume=opp['potential_volume'], estimated_profit_usdt=opp['estimated_profit_usdt'], timestamp=datetime.now(timezone.utc), confidence=opp['confidence'] ) opportunities.append(arp) self.opportunities = opportunities return opportunities except json.JSONDecodeError as e: print(f"[Error] Failed to parse HolySheep response: {e}") return [] def find_best_arbitrage( self, min_profit_pct: float = 0.1, min_confidence: float = 0.7 ) -> Optional[ArbitrageOpportunity]: """最高利益の機会を返す""" valid = [ opp for opp in self.opportunities if opp.profit_pct >= min_profit_pct and opp.confidence >= min_confidence ] if not valid: return None return max(valid, key=lambda x: x.estimated_profit_usdt) async def main(): # HolySheepクライアント初期化 client = HolySheepLLMClient(api_key=HOLYSHEEP_API_KEY) analyzer = CrossExchangeArbitrageAnalyzer(client) # サンプルOrder Bookデータ sample_books = [ { "exchange": "binance", "symbol": "BTC-USDT", "best_bid": 67450.00, "best_ask": 67455.00, "bid_size": 2.5, "ask_size": 1.8, "spread_pct": 0.0074, "timestamp": datetime.now(timezone.utc).isoformat() }, { "exchange": "bybit", "symbol": "BTC-USDT", "best_bid": 67458.00, "best_ask": 67462.00, "bid_size": 1.2, "ask_size": 0.9, "spread_pct": 0.0059, "timestamp": datetime.now(timezone.utc).isoformat() }, { "exchange": "okx", "symbol": "BTC-USDT", "best_bid": 67448.00, "best_ask": 67452.00, "bid_size": 3.0, "ask_size": 2.2, "spread_pct": 0.0059, "timestamp": datetime.now(timezone.utc).isoformat() } ] # Arbitrage分析実行 opportunities = await analyzer.analyze_opportunities(sample_books) print(f"\n=== Detected {len(opportunities)} Arbitrage Opportunities ===") for opp in opportunities: print(f""" {opp.buy_exchange} → {opp.sell_exchange} Profit: {opp.profit_pct:.4f}% Volume: {opp.potential_volume} BTC Est. Profit: {opp.estimated_profit_usdt:.2f} USDT Confidence: {opp.confidence:.0%} """) if __name__ == "__main__": asyncio.run(main())

Step 3: Order Book統合クラス(最終版)


"""
完全版:Tardis + HolySheep 跨所Order Book統合システム
"""

import asyncio
from dataclasses import dataclass, field
from datetime import datetime, timezone
from typing import Dict, List, Optional, Tuple
from sortedcontainers import SortedDict
import json

@dataclass
class MergedOrderBook:
    """統合Order Book"""
    symbol: str
    timestamp: datetime
    source_exchanges: List[str]
    merged_bids: List[Dict]  # [{exchange, price, size}]
    merged_asks: List[Dict]
    arbitrage_windows: List[Dict]  # 裁定可能窗口
    
    def to_json(self) -> dict:
        return {
            "symbol": self.symbol,
            "timestamp": self.timestamp.isoformat(),
            "source_exchanges": self.source_exchanges,
            "merged_bids": self.merged_bids[:10],
            "merged_asks": self.merged_asks[:10],
            "arbitrage_windows": self.arbitrage_windows
        }


class OrderBookMerger:
    """
    複数取引所のOrder Bookを統合
    裁定取引可能な価格帯を検出
    """
    
    # 取引手数料(例:Binance: 0.1%, Bybit: 0.1%)
    EXCHANGE_FEES = {
        'binance': 0.001,
        'bybit': 0.001,
        'okx': 0.0015,
        'bitget': 0.001,
        'gateio': 0.002,
    }
    
    def __init__(self, symbol: str, exchanges: List[str]):
        self.symbol = symbol
        self.exchanges = exchanges
        self.order_books: Dict[str, dict] = {}
        self.last_update: Dict[str, datetime] = {}
    
    def update_book(self, exchange: str, book_data: dict):
        """各取引所のOrder Bookを更新"""
        self.order_books[exchange] = book_data
        self.last_update[exchange] = datetime.now(timezone.utc)
    
    def merge(self, depth: int = 20) -> MergedOrderBook:
        """
        全取引所のOrder Bookを板の深さで統合
        
        統合戦略:
        1. 全取引所のBid/Askを集約
        2. 取引所別にソート
        3. 裁定取引可能窗口を計算
        """
        all_bids = []  # [(exchange, price, size)]
        all_asks = []  # [(exchange, price, size)]
        
        for exchange, book in self.order_books.items():
            fee = self.EXCHANGE_FEES.get(exchange, 0.001)
            
            # Bid追加(板の厚みを考虑)
            for price, size in book.get('bids', [])[:depth]:
                all_bids.append({
                    'exchange': exchange,
                    'price': price,
                    'size': size,
                    'fee': fee
                })
            
            # Ask追加
            for price, size in book.get('asks', [])[:depth]:
                all_asks.append({
                    'exchange': exchange,
                    'price': price,
                    'size': size,
                    'fee': fee
                })
        
        # 価格でソート
        all_bids.sort(key=lambda x: x['price'], reverse=True)
        all_asks.sort(key=lambda x: x['price'])
        
        # 裁定取引窗口を検出
        arbitrage_windows = self._find_arbitrage_windows(all_bids, all_asks)
        
        return MergedOrderBook(
            symbol=self.symbol,
            timestamp=datetime.now(timezone.utc),
            source_exchanges=list(self.order_books.keys()),
            merged_bids=all_bids[:depth],
            merged_asks=all_asks[:depth],
            arbitrage_windows=arbitrage_windows
        )
    
    def _find_arbitrage_windows(
        self, 
        bids: List[dict], 
        asks: List[dict]
    ) -> List[dict]:
        """
        裁定取引可能な窗口を検出
        
        Buy Low, Sell High戦略:
        - ある取引所のAsk < 別の取引所のBid なら裁定可能
        - 手数料を差し引いて純利益を計算
        """
        windows = []
        
        for bid in bids:
            for ask in asks:
                # 同じ取引所は無視
                if bid['exchange'] == ask['exchange']:
                    continue
                
                # 裁定可能条件:Bid > Ask
                gross_profit = (bid['price'] - ask['price']) / ask['price'] * 100
                
                # 手数料計算
                total_fees = (bid['fee'] + ask['fee']) * 100
                
                # 純利益
                net_profit = gross_profit - total_fees
                
                if net_profit > 0:
                    # 取引可能量を計算
                    max_volume = min(bid['size'], ask['size'])
                    estimated_profit = max_volume * (bid['price'] - ask['price'])
                    
                    windows.append({
                        'buy_exchange': ask['exchange'],
                        'buy_price': ask['price'],
                        'sell_exchange': bid['exchange'],
                        'sell_price': bid['price'],
                        'gross_profit_pct': round(gross_profit, 4),
                        'total_fees_pct': round(total_fees, 4),
                        'net_profit_pct': round(net_profit, 4),
                        'max_volume': round(max_volume, 6),
                        'estimated_profit_usdt': round(estimated_profit, 2),
                        'detected_at': datetime.now(timezone.utc).isoformat()
                    })
        
        # 利益率でソート
        windows.sort(key=lambda x: x['net_profit_pct'], reverse=True)
        
        return windows[:10]  # Top 10
    
    def get_cross_exchange_spread(self) -> Dict:
        """跨所スプレッドを取得"""
        all_best_bids = []
        all_best_asks = []
        
        for exchange, book in self.order_books.items():
            bids = book.get('bids', [])
            asks = book.get('asks', [])
            
            if bids:
                all_best_bids.append((exchange, bids[0][0], bids[0][1]))
            if asks:
                all_best_asks.append((exchange, asks[0][0], asks[0][1]))
        
        if not all_best_bids or not all_best_asks:
            return {}
        
        # 最高Bid vs 最低Ask
        best_bid = max(all_best_bids, key=lambda x: x[1])
        best_ask = min(all_best_asks, key=lambda x: x[1])
        
        spread = best_bid[1] - best_ask[1]
        spread_pct = spread / best_ask[1] * 100
        
        return {
            'best_bid': {
                'exchange': best_bid[0],
                'price': best_bid[1],
                'size': best_bid[2]
            },
            'best_ask': {
                'exchange': best_ask[0],
                'price': best_ask[1],
                'size': best_ask[2]
            },
            'spread': round(spread, 2),
            'spread_pct': round(spread_pct, 4)
        }