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Curating the best decentralized applications and infrastructure for the Web3 economy.

OpenSea API

Free

NFT APIs

OpenSea API is a developer API to build custom marketplaces powered by Ethereum smart contracts.

Ethereum

About OpenSea API

OpenSea API is a developer toolkit introduced in 2018 that enables building custom marketplaces powered by Ethereum smart contracts.

It allows developers to run auctions in any currency, including their own tokens, and to view analytics through OpenSea.js.

Listings require NFTs to be ERC721 or ERC1155 compliant.

The API is free to use, but access to an API key is granted only after submitting an application form and awaiting approval.

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