One question: What does a DEX aggregator do?
An aggregator itself generally doesn't provide liquidity; it just routes trades, calling underlying DEX pools to complete swaps.
When swapping through an aggregator, you should also set a slippage limit. If it's too high, sandwich attacks can easily take a bigger cut.
When swapping through an aggregator on Ethereum, pay gas with $ETH ; $1INCH is 1inch's governance token.