What is the fee for Biswap swap?

Excuse me, could you please clarify the fee structure for conducting swaps on the Biswap platform? I'm particularly interested in understanding if there are any standard fees that apply to each swap transaction, or if the fee varies based on certain factors such as the amount being swapped, the trading pair involved, or the current network congestion. Additionally, are there any other associated costs or fees that users should be aware of when using Biswap for swapping purposes? Thank you in advance for your assistance with this inquiry.