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OpenAI's self-hosted client for connecting private or localhost MCP servers to ChatGPT, Codex, the Responses API, and AgentKit through Secure MCP Tunnel without exposing the MCP listener to the public internet.

Exa MCP Server adds web search and public-page fetching to AI assistants. Its hosted endpoint can be connected through compatible remote-MCP clients without running a server. Anonymous use is rate-limited, while higher limits and research tools have separate authentication and cost boundaries.