Fee

Transaction Fee
OneSwap charges the Taker a fixed 0.5 % of transaction fees based on the transaction amount, while Maker does not need to pay. 

Miner Fee (Gas)
ETH transfer fee is calculated based on Gas ( fuel ) consumption. (ETH miner fee = Gas Limit x Gas Price)

Gas：
Ethereum introduces the concept of Gas. Each calculation during transaction process needs to consume Gas, and Ethereum specifies the amount of Gas consumption for all operations and contracts. So, in other words, Gas reflects the "workload" of each transaction. A transactions with low workload consume a small amount of Gas, while a transaction with high workload consume a large amount of Gas. Therefore,  Gas is also called the "fuel" of the Ethereum network.

Gas Limit：
Gas Limit is the maximum amount of Gas consumption that users are willing to pay for a successful transaction. If the actual Gas is over Gas Limit set by the user, then the transaction will be failed; if the actual Gas is under Gas Limit, then the transaction will be successfully and the unused Gas will be "returned" to the user's wallet.

Gas Price：
Gas Price is the price that users are willing to pay for each Gas. The unit of Gas is GWEI, 1 GWEI = 0.000000001 ETH.
Calculation Formula: Miner Fee = Gas Amount x Gas Price

Therefore, Ethereum miner fee is calculated based on Gas and paid by ETH.