Which MCP servers are the safest to use?

The safest MCP servers are listed on our Most Secure leaderboard at spiderrating.com/leaderboard/security, ranked by security score. As of March 2026, no MCP server has achieved an A grade (9.0+); the top tier is grade B (7.0–8.9), held by only 211 servers (1.3% of the ecosystem). When choosing a server, prefer ones with B grade or higher, active maintenance (commits within the last 90 days), a clear license, and no critical hard-constraint failures. Our top-rated leaderboard combines security with description quality and metadata health.