Token approval: Approve vs Approve Limited Permission

Like any protocol using smart contracts, you need to provide permissions from the wallet you are using, which requires a transaction to occur with minor gas fees.

Choosing Approve means you do not want to approve each time you interact with these tokens in Bancor. Choosing "Approve limited permission" means you do not want the contracts to maintain rights to move previously approved tokens on your behalf, and allows you to specify the number of tokens it can interact with.