code: def get_blockchain_fee_estimates(coin_symbol='btc', api_key=None):
      
      overview = get_blockchain_overview(coin_symbol=coin_symbol, api_key=api_key)
      return {
              'high_fee_per_kb': overview['high_fee_per_kb'],
              'medium_fee_per_kb': overview['medium_fee_per_kb'],
              'low_fee_per_kb': overview['low_fee_per_kb'],
              }
docs: Returns high, medium, and low fee estimates for a given blockchain.