humanMCP Marketplace — federated listings across personal MCP servers

This is a federated classifieds board that indexes listings across independent humanMCP servers. It exposes three MCP tools: search_marketplace for querying offers and trades, list_servers to see all registered instances, and get_server for details on a specific node. The marketplace crawls servers every six hours via their /.well-known/agent.json and /listings/feed.json endpoints, building a searchable SQLite index while keeping content on origin servers. You'd use this when your agent needs to search for goods, services, or trades posted by humans running their own humanMCP instances. Registration is open to any server exposing the humanMCP protocol. Think of it as a search layer over a network of personal storefronts.