Use the Alchemy MCP server (`https://mcp.alchemy.com/mcp`) for live blockchain data and admin work — 159 tools across 100+ chains for token prices, transactions, simulation, tracing, account abstraction, Solana DAS. For NFT marketplace data, listings, or Seaport fulfillment, use `opensea-api` / `opensea-marketplace`. For shipped app code, use `alchemy-api` (with API key) or `alchemy-agentic-gateway` (without). When the CLI is installed locally, prefer `alchemy-cli`.