OpenSea: The Biggest NFT Marketplace and What You Need to Know

When you think of buying or selling an NFT, OpenSea, the largest and most widely used NFT marketplace built on Ethereum and other blockchains. Also known as the go-to platform for digital collectibles, it lets anyone list, bid on, or instantly buy NFTs without needing to code or run a website. Since its launch in 2017, OpenSea has handled over $40 billion in trades, making it the default starting point for most new and experienced NFT users.

OpenSea doesn’t create NFTs—it just hosts them. That means it supports any token that follows standards like ERC-721, the original Ethereum standard for unique, non-fungible tokens, or ERC-1155, a more flexible standard that allows both unique and batched tokens. You can trade everything from digital art and virtual land to profile pictures and in-game items—all in one place. The platform works with popular crypto wallets like MetaMask and Coinbase Wallet, so you keep control of your assets. No KYC is required to list or browse, which is why it’s popular among users who value privacy.

But OpenSea isn’t perfect. It charges a 2.5% fee on every sale, and gas fees on Ethereum can spike during busy times. It also doesn’t verify creators, so scams and fake collections are common. That’s why many buyers check the seller’s history, look at trading volume, and avoid new collections with no track record. Still, for sheer variety and ease of use, nothing else comes close. Whether you’re selling a rare CryptoPunk or just testing the waters with a $5 pixel art piece, OpenSea is where the action is.

Below, you’ll find real reviews and breakdowns of platforms and tokens tied to OpenSea’s ecosystem—from NFT standards like ERC-721 and ERC-1155, to wallet setups, trading tips, and how to avoid scams. These aren’t promotional posts. They’re honest, practical guides from people who’ve been through the ups and downs of the NFT market.