While it doesn't cost anything to create an account with OpenSea and start browsing, there are a couple of one-time fees you'll see when you list an item on Ethereum for the first time.
Let's learn more!
First-time Ethereum fees
- You may need to pay gas to allow Seaport to interact with your item (or all items in the collection, if the collection supports it). This has to be done once per collection.
- If this is your first time listing an auction, you will also need to approve WETH for use. WETH (Wrapped ETH) is an ERC-20 token, equal in value to ETH, that allows users to make pre-authorized bids that can be fulfilled at a later date without any further action from the bidder.
After those, you'll see a signature request to finalize your listing. In the future, as long as the item was approved in the steps above, you won't have any additional transactions to list that NFT at all, only a signature.
You can check out these guides for more information on how to sell your NFT: