Best MCP Gateways for Enterprise Teams in 2026

I spent the last few months evaluating MCP gateways for a mid-size financial services client. Their agentic stack had grown organically: one team was using local STDIO servers, another had hand-rolled HTTP wrappers, and nobody had a clear answer when the CISO asked "who can see what tools our agents are calling?" That conversation was the starting gun. What followed was several weeks of standing up test environments, reading compliance documentation, and talking to engineers who had actually run