MCP.so

MCP.so indexes Model Context Protocol servers and clients, serving developers wiring AI agents to external tools and data.

Submission is free with editorial review; account requirements and link type are undocumented. The category is young, which means less competition for visibility than general AI directories.

At DR 72 with roughly 10K monthly organic visits, the audience is small but almost entirely technical. If you ship an MCP server, this is one of the few places people specifically look for one.