The basic environment for precious metals trading consists of two dimensions: capital security and cost controllability. This article analyzes the fund guarantee mechanism: customer funds are deposited in independent trust accounts of licensed banks and are completely isolated from operating funds. Bank statements are audited and verified quarterly. Negative balance protection ensures that losses are limited to the principal. Deposits and withdrawals follow the same closed-loop return control. In terms of transaction costs, there is a zero commission plus spread model. Floating and fixed spreads are optional. Overnight interest estimates and total costs are displayed before submission to build a traceable and verifiable trading environment.