$ETH highlights a critically important topic: the cost of operations in the crypto world. These "service fees" can vary. **Network fees (Gas Fees)** are paid to miners/validators for confirming transactions on the blockchain (e.g., ETH, BTC). Their size depends on network congestion and the speed you are willing to pay for. **Exchange fees** include trading fees (taker/maker), deposit/withdrawal fees, and sometimes storage wallet fees. In **DeFi**, you pay gas for interacting with smart contracts and often a protocol fee for swaps, lending, or farming. Key point: **always consider fees when