What the fee pays for
Every transaction asks the network to do some work: check a signature, update a balance, run a contract. That work is measured in units called gas. A plain ETH transfer uses a fixed, small amount; a token transfer uses more because the token contract has to update two balances and emit a record.
The fee you pay is the gas used multiplied by the gas price at that moment. On Robinhood Chain both are paid in ETH, whatever token you are actually moving.
Why the price moves
The gas price rises when many people want space in the next blocks and falls when the chain is quiet. Wallets suggest a price that should get your transaction included soon; paying more rarely helps on a chain whose blocks arrive in a fraction of a second.
Because the fee is tied to computation and not to the amount, sending ten dollars and sending ten thousand cost the same.
Reading the fee before you sign
Gleo's Send tool estimates the gas for your exact transfer, multiplies it by the current gas price and converts the result to dollars using a live ETH price. You see that figure before your wallet opens, and the network panel shows the same calculation for a standard USDG transfer every few seconds.