Most platforms also charge a service fee, called a "gas fee" for the computational mining caused by transactions using Ethereum’s blockchain. For example, Nifty Gateway takes 5% plus $0.30 of every secondary sale. SuperRare takes 3% transaction from all purchases, paid by the buyer. Foundation charges up to a whopping 15% commission depending how quickly you want the transaction to be completed and how busy the network is at the time of your transaction. While OpenSea, on the other hand, offers a “lazy minting” option, which amounts to the deferred payment of gas fees until the actual sale.