OpenSea provides open-source SDKs and tools for building on the marketplace. Each package is maintained in its own GitHub repository — see the individual pages below for quick start guides and links to full documentation.

Package	Description	Install
@opensea/sdk	TypeScript SDK for trading NFTs and tokens (ethers.js + viem)	`npm install @opensea/sdk`
@opensea/stream-js	Real-time marketplace events over WebSocket	`npm install @opensea/stream-js`
@opensea/cli	CLI and programmatic SDK for querying the API	`npm install -g @opensea/cli`
MCP	AI tool integration via Model Context Protocol	Setup guide
Agent Skill	AI agent skill for Claude Code, Cursor, and Windsurf	`npx skills add ProjectOpenSea/opensea-skill`

All packages require an OpenSea API key. Get one at Settings -> Developer.