Fees, and where they go

Read the live values from GET /api/v1/settings

Fee	Size today	Paid by	Goes to
Site fee	1% of the trade (fees.siteFeeBps = 100)	The trader, inside the trade	The platform. When a referrer is named, 0.2% of the trade (fees.referrerBps = 20) goes to them in the same transaction.
Pool fee	The pool’s fee tier: 1% by default	The trader, charged by the pool	On buys: split between the creator’s royalty (60%), the platform (30%) and the weekly pot (10%), after PancakeSwap keeps its own share. On sells: paid in the token and burned.
Launch fee	launch.launchFeeWei = 0	—	Launching is free.

Gas is separate, paid to the network, and every build tells you its most in cost.max.

Never hard-code a fee. They’re read from the chain; GET /settings has them.