Lunar.dev MCP Gateway (MCPX) vs Onyx Platform: Side-by-Side Comparison (2026)

Lunar.dev MCP Gateway (MCPX)

Security teams deploying Claude or other agentic AI systems will find real value in MCPX's per-agent tool restrictions and immutable audit logs that actually capture prompt payloads and attribution, not just API calls. The role-based access control with on-behalf-of tracking addresses the specific governance gap that makes AI agents harder to audit than traditional service accounts. This tool prioritizes Govern and Detect over Respond, which works if your security model treats agent behavior as inherently less trustworthy than human access. Skip MCPX if you're looking for a lightweight proxy; the MCP Risk Score Engine is beta and Lunar.dev's 15-person team means you're betting on a startup's ability to track an evolving threat surface faster than vendors with security divisions.

Onyx Platform

Mid-market and enterprise security teams deploying AI agents across multiple LLMs need Onyx Platform because it's the only control plane that catches shadow AI deployments and unapproved model usage before they become compliance violations. The natural language policy engine and real-time prompt injection blocking cover both governance (GV.PO) and continuous monitoring (DE.CM) without requiring security teams to become prompt engineers. Skip this if your organization runs fewer than three LLM integrations or if you need post-incident forensics more than active agent behavior enforcement; the session replay is solid but the tool's real strength is prevention during runtime, not reconstruction after the fact.