Updated 24 Aug 2020
Deribit has a maker-taker fee model. This means that orders providing liquidity could have different fees versus orders that take liquidity. Fees vary per product and are calculated as a percentage of the underlying asset of the contract.
Please note: Options fees can never be higher than 12.5% of the options price. For example, if an option is traded at 0.0001 BTC, the taker fee will be 0.0000125 BTC (instead of 0.0003 BTC), therefore 12.5% of 0.0001 BTC.