Does 1inch charge fees?

Short answer: No.

Long answer: the swap rates 1inch Aggregation Protocol offers to users already include various fees charged by DEXes. As we strive to give our users the best swap rates, adding any extra charges on top of those already charged by DEXes would not serve that purpose. Therefore, 1inch’s policy is to charge no on-top fees to make sure that users get the best possible rates.