A token approval is an on-chain declaration which will allow a contract to move tokens from your wallet.
What Happens When I Make An Approval?
Making a token approval changes the status on the blockchain, thus the transaction consumes gas as payment. Token approval takes place the first time your wallet interacts with the contract, so that the contract then has the ability to move tokens when you ask it to.
It's important to note that Sushi does not set or collect the gas fees paid for approvals. Their costs are determined by the corresponding network’s congestion - you can always track gas prices on Etherscan or on other relevant block explorers and platforms.
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