How to calculate maximum quantity in futures with python-binance?

API Futures API
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1

I have a Python script that buys and sells in Futures with leverage set to 2. However, when I try to calculate the quantity to buy for each order using my maximum available funds, I encounter an “Insufficient Margin” error. I’m trying to understand how Binance calculates the maximum quantity I can buy with 100% of my funds.

For example:

  • I have $10,000.
  • I want to buy at a price of $20,000.
  • I expect to be able to buy 1 BTC with my leverage of 2.

However, the calculated quantity is lower than expected. What am I missing?

Here are the relevant code snippets I’m currently using for the calculations:

# Calculating the balance with leverage:
account_info = client.futures_account()
balance = float(account_info['totalWalletBalance'])
total_usdt_with_leverage = float(balance * self.leverage)

quantity = float(format(total_usdt_with_leverage / <price_to_buy>, '.3f'))

Please note that <price_to_buy> should be replaced with the actual price at which you want to buy.

Anyone can help me to perform this calculation?

2

Hello, the quantity calculation takes in account quantity precision and notional in attention (check exchangeInfo endpoint).
I haven’t looked into this post, but it seems to touch similar questions as yours, please have a look: Max quantity calculation - #5 by yovanoc

Note: we don’t support python-binance (not official lib).