What a user may pay
Pump.fun publishes platform, creator and liquidity-related fee schedules for supported trading paths. Those charges belong to the application transaction. Solana separately charges SOL for signatures, computation and any applicable priority fee. PUMP does not automatically pay either layer simply because it is the platform token.
Review the current fee page at the moment of a trade because rates and supported quote assets can change. Also inspect minimum received, price impact and token liquidity. A low network fee does not make a thin or rapidly moving market safe, and a displayed platform percentage is not the complete cost of a failed or retried transaction.