Explanation about how fees works in API results

API Spot/Margin API
1

Fees are presents in many API model like Trades, Withdraws, Fiat Payments and so on.

I would like to understand how fees works on Binance API to understand how to parse that data.
As far as I understand, there could be three different cases

Assume we have two different trades, one for ETHEUR and one for BNBEUR
Also assume my current balance is like this

  • ETH Balance: 1 ETH
  • BNB Balance: 1 BNB
  • EUR Balance: 1000 EUR

Scenario 1) Buy ETH by selling EUR with commissionAsset equal to ETH

I purchase some ETH by selling EUR. Here’s a real API result example

    {
        "symbol": "ETHEUR",
        "id": <TRADE_ID>,
        "orderId": <ORDER_ID>,
        "orderListId": -1,
        "price": "1258.07000000",
        "qty": "0.15885000",
        "quoteQty": "199.84441950",
        "commission": "0.00015885",
        "commissionAsset": "ETH",
        "time": <TRADE_TIMESTAMP>,
        "isBuyer": true,
        "isMaker": false,
        "isBestMatch": true
    },

Could you explain how the commission is applied here? After executing the trade, my final ETH balance would be increased by qty - commission?

Scenario 2) Buy ETH by selling EUR with commissionAsset equal to BNB

In this scenario, I have enabled Binance to use my BNB balance to receive a discount on the commission

    {
        "symbol": "ETHEUR",
        "id": <TRADE_ID>,
        "orderId": <ORDER_ID>,
        "orderListId": -1,
        "price": "1800.00000000",
        "qty": "0.27799000",
        "quoteQty": "500.38200000",
        "commission": "0.00095876",
        "commissionAsset": "BNB",
        "time": <TRADE_TIMESTAMP>,
        "isBuyer": true,
        "isMaker": true,
        "isBestMatch": true
    },

Could you explain how the commission is applied here? After executing the trade, my final ETH balance would be increased by qty but my BNB balance would be reduced by 0.00095876 BNB because of the commission?

Scenario 3) Buy BNB by selling EUR with commissionAsset equal to BNB

How does it work in both cases if I have enabled or disabled to use BNB as the commissionAsset?

    {
        "symbol": "BNBEUR",
        "id": <TRADE_ID>,
        "orderId": <ORDER_ID>,
        "orderListId": -1,
        "price": "479.00000000",
        "qty": "0.20870000",
        "quoteQty": "99.96730000",
        "commission": "0.00015652",
        "commissionAsset": "BNB",
        "time": <TRADE_TIMESTAMP>,
        "isBuyer": true,
        "isMaker": true,
        "isBestMatch": true
    },

Could you explain how the commission is applied here in both cases (enabled/disabled BNB as commissionAsset)?

  1. If I have “enabled” the BNB option as commissionAsset will I receive the full qty but my BNB balance is reduced by commission?
  2. If I have disabled the BNB option as commissionAssetwill I receive qty - commission?
2
  1. Yes
  2. Yes
3

Hi there Dino, your answer is confusing me. I made three different scenarios with different questions, could you please answer to all the three scenarios and explains how fees and final balances works?