text: from main.entities.crypto_stats import CryptoStats
  
  class CryptoStatsClient:
      """Interface for CryptoStatsClient : Client which fetch crypto trading stats"""
  
      async def get_crypto_trading_stats (self, product_id: str) -> CryptoStats:
          """Get trading stats for a currency pair (ex : for BTC-USD, use btc-usd as product_id)"""
          pass