OpenSea is the first NFT marketplace launched in 2017. The platform operates on the principles of a decentralized community: cryptocurrency wallets
, addresses and assets are controlled by the users themselves. The marketplace protocol supports Ethereum, Polygon and Klaytn Blockchain.
OpenSea NFT protocol uses ERC721 and ERC1155 standard tokens (for collections). You can pay with ERC20 tokens. You can buy NFT with a bank card through the MoonPay service.
A feature of OpenSea is its wide selection of categories. Popular categories include art, sports, collectible cards, and designs from famous artists. You can also buy NFT on the site in the form of audio, domain name or 3D object.
OpenSea's standard fee is 2.5% of the NFT value. The fee is charged to the buyer. The creator of the token pays for the gas of the transaction only at the first placement.