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OpenSea is an NFT marketplace and token trading platform. The plugin covers token swaps, NFT drops and minting, and marketplace trading, fetching unsigned calldata from the OpenSea REST API or CLI and submitting transactions through Base MCP send_calls. Chains: Ethereum, Base, Polygon, Arbitrum, Optimism, and Avalanche. Operations: token swaps, NFT best-listing reads, NFT purchases, cross-chain fulfillment, listing flows, drops discovery, and minting.
API key required. The assistant creates or uses an OpenSea API key before calling endpoints. NFT trades and swaps are irreversible, so collection, token ID, payment token, price, and chain are confirmed first.

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Install OpenSea CLI

Shell-capable harnesses can use the OpenSea CLI: 
npx @opensea/cli@latest --help
The REST API path is also supported when api.opensea.io is reachable and an API key is available.

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Try it

Swap
Swap 0.02 ETH for USDC on Base
Buy NFT
Buy a Bored Ape on Ethereum
Drops
What drops are coming up on Base?

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Pattern

The assistant creates or loads an API key, gets the wallet address, then calls OpenSea API or CLI commands for quotes, listings, drops, or fulfillment data. OpenSea write responses contain unsigned transaction objects. The assistant converts decimal value fields to hex, maps each transaction to { to, value, data }, and submits send_calls on the matching chain. Cross-chain fulfillment may require multiple transactions on different chains. Those are submitted in order, waiting for confirmation before the next step.

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Reference

Full plugin spec on GitHub

API key flow, CLI usage, swaps, drops, NFT fulfillment, value conversion, and risk checks.