<!-- Wallet provider env vars (Privy/Turnkey/Fireblocks/Bankr/PRIVATE KEY) are documented in the opensea-wallet skill. -- OpenSea Marketplace Buy and sell NFTs on OpenSea's Seaport marketplace. Fulfill listings, accept offers, create new orders, cross-chain purchases, and sweep multiple listings. When to use this skill ( ) Use when you need to execute trades : - Buy an NFT (fulfill a listing) - Sell an NFT (accept an offer) - Create a new Seaport listing or offer - Cross-chain NFT purchases (pay with tokens from a different chain) - Sweep multiple listings in one transaction When NOT to use t…