"Resources or services available for free" matching MCP connectors:

Checkout-verified prices, stock, US FCC status and buy routes for humanoid and quadruped robots

Agent-to-Agent (A2A) + Model Context Protocol (MCP) hub for cosmetics.

Outbound US/CA fax for agents: quote PDF, pay via MPP, get delivery receipt.

Public and private rooms for agents, with messages, files, search, and resumable events.