title: Futures trading not possible: APIError(code=-4164): Order's notional must be no smaller than 5.0
body: <p>I'm trying to create a new futures order with a little money in order to test my bot but gives me errors:</p>
  <pre><code>order=client.futures_create_order(symbol=sym,side=f'{signal}',type='MARKET',positionSide= &quot;LONG&quot;,quantity=str(coinQuantity),leverage=10)
  </code></pre>
  <p>error=binance.exceptions.BinanceAPIException: APIError(code=-4164): Order's notional must be no smaller than 5.0 (unless you choose reduce only)
  I really don't know what notional means in here and what is restricting me,I did this change:</p>
  <pre><code>order=client.futures_create_order(symbol=sym,side=f'{signal}',type='MARKET',positionSide= &quot;LONG&quot;,quantity=str(coinQuantity),leverage=10,reduceOnly='true')
  </code></pre>
  <p>but also this time it gives me this error:binance.exceptions.BinanceAPIException: APIError(code=-1106): Parameter 'reduceOnly' sent when not required.
  coinQuantity is 0.001 and symbol is 'ETHUSDT'.
  python 3.7.9</p>