What is the current Network Fees?
The network fees or commissions change from time to time. You should know the commission charges at that particular instant when you make a transaction.
For Ethereum Network:
You can monitor gas trackers like - ethgasstation.info, gasnow.org or etherscan.io to check the current gas price for ETH. You can also check the gas price in the confirmation window that appears while making a transaction.
For Tron Network:
You need to keep at least 70 - 80 TRX extra to interact with x3 and x4 programs, whereas extra 150 TRX is required to interact with the xGold program. There may be some variations in the Tron network fee in the upcoming future.