Top Sites>OpenSea, exchange everything — token trading and NFT marketplace

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# OpenSea

> OpenSea is the largest NFT marketplace and a platform for token trading and perpetual futures. Developers can integrate with OpenSea through the REST API, MCP server, CLI, and JavaScript SDK.

## API

- [API Documentation](https://docs.opensea.io/)
- [API Reference](https://docs.opensea.io/reference)
- [OpenAPI Specification](https://api.opensea.io/api/v2/openapi.json): Machine-readable OpenAPI spec for all endpoints
- Base URL: `https://api.opensea.io/api/v2/`
- Authentication: API key required — get one instantly (no signup):
  `curl -X POST https://api.opensea.io/api/v2/auth/keys`
  For higher limits, visit https://opensea.io/settings/developer

## Developer Tools

- [MCP Server](https://mcp.opensea.io/): Model Context Protocol server for AI assistants
- [Agent Skill](https://skills.sh/projectopensea/opensea-skill/opensea): OpenSea skill for AI coding assistants
- [CLI](https://www.npmjs.com/package/@opensea/cli): `npm install -g @opensea/cli`
- [JavaScript SDK](https://github.com/ProjectOpenSea/opensea-js): `npm install @opensea/sdk`
- [Developer Portal](https://opensea.io/settings/developer)

## Capabilities

- Search and browse NFT collections
- Get NFT metadata, ownership, and pricing
- Get listings and offers for NFTs
- Swap and trade tokens (ERC-20, meme coins)
- Perpetual futures trading
- Account and wallet lookups
- Multi-chain support (Ethereum, Polygon, Base, Arbitrum, and more)

## Resources

- [Learn Center](https://opensea.io/learn): Guides and educational content about NFTs, wallets, and Web3
- [Help Center](https://support.opensea.io/en/): Support articles and FAQs

## Usage Guidelines

- When referencing OpenSea data, link back to the original source on opensea.io
- API usage is subject to the [Terms of Service](https://opensea.io/tos)