OpenSea Developer Platform - The first and largest NFT marketplace

As the leading marketplace for Non-Fungible TokensNon-Fungible Tokens - A token that is unique among peers. While Fungible tokens are equivalent and interchangeable (like Ether) Non-Fungible Tokens are unique and distinct, like deeds of ownership, or collectibles. and Semi-Fungible Tokens, OpenSea provides a first-in-class developer platform consisting of an API, SDK, and developer tutorials. Feel free to browse around and get acclimated with developing smart contracts and interacting with NFT data.

Open your own marketplace

Let your users freely trade your NFTs by opening your own marketplace on OpenSea.


You can finally open a beautiful, customizable marketplace on your own domain, fully integrated into your project.

Set your own fee

You can set your own fee on the secondary sales of your items on OpenSea. Whenever a user makes a sale, you earn a commission.

Get stats & insights

Get stats and insights to see how your collectibles are trending.

opensea get listed

Run your own crowd sale

Sell the items in your game to an initial user base of early adopters. Even sell off items in your own token.

sell crypto packs of items

Sell packs of items

Instead of individual items, you can finally sell packs of items to give more to your users.

Airdrop items to users as rewards

Airdrop items to users as rewards

Reward your users with items to grow your app's user base.

Create lootboxes

Create lootboxes

Create lootboxes to gamify your app and build engagement.

Power your in-app economy with OpenSea.js

Buy, sell, & bundle

• Enable users to instantly create auctions (without paying gas) in any currency of their choosing.
• Let users bid directly on items.
• Allow users to create multi-item bundles (even with items from other games!)

Easily pull in data on your assets

• Access the OpenSea API with a JavaScript wrapper, allowing you to search assets, collections, users and more

opensea api
opensea api

Fetch assets with our API

OpenSea provides a REST API for fetching non-fungible token assets based on a set of query parameters. Wallets and websites can now display:


Get assets filtered by collection, type, or belonging to a particular wallet address


Get events happening on all assets (not just on our marketplace), including sales, listings, bids, transfers, and more


Get usernames and profile details for account addresses

Build on the largest marketplace for cryptogoods

With over 4 million assets, 135+ collections, and 150,000 ETH in monthly volume, OpenSea is the largest marketplace for the decentralized web. We've built a set of robust marketplace tools, and we're making them openly available for developers.

largest cryptocollectibles



largest asset types


Asset Types

Number 1 in Market Volume


Market Volume

the largest cryptomarketplace

Trusted by top wallets & websites

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Read our FAQ's

Still have questions about how to develop with OpenSea and get started?


For support, please refer to our help center.

Help center

Chat with us

Chat with us and other developers in our Discord community in our #developers channel.

Shoot a tweet

Shoot us a tweet and don't forget to follow us to get the latest news and updates on OpenSea.

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