Network, or gas fees, fluctuate based on supply and demand for the computational power of the network. If there is a lot of congestion, you can expect higher gas fees and vice versa. Low gas fees would be considered anywhere from 0 to 30 GWEI, whereas higher gas prices would include base fees of 80+ GWEI.
There do tend to be certain times of the day or days of the week when gas prices average lower. You can view Ethereum gas trends on ethereumprice.org. We’d also recommend installing a gas tracker to monitor how gas is trending. For example, the DeFi Saver Gas Prices Extension can be added to your browser so that you can see how the price is fluctuating.
When you're trading on Bebop for the first time, you might need to pay for network fees with ETH or MATIC for first time token approval. If you already have an active Permit approval for the token you want to swap, you can proceed to swap on Bebop by signing message and Bebop will deduct network fees from the token you're swapping - this means you don't need to allocate ETH or MATIC to pay for network fees!