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

KeyRunner: Governed runtime securing AI agent API calls with credential injection & PII redaction. built by KeyRunner. Core capabilities include Pre-execution policy enforcement with RBAC before every API call, Runtime credential injection from external vaults without exposing secrets to agents, PII, PHI, and card data redaction from API responses before reaching the agent..

Lunar.dev MCP Gateway (MCPX): Gateway for securing, governing, and auditing AI agent access to MCP servers. built by Lunar.dev. Core capabilities include Centralized MCP server registry with service discovery for local and remote servers, Role-based access control (RBAC) with per-agent tool restrictions and on-behalf-of attribution, Authentication to MCP servers via API keys or OAuth..

Both serve the Agentic AI Security market but differ in approach, feature depth, and target audience.

KeyRunner differentiates with Pre-execution policy enforcement with RBAC before every API call, Runtime credential injection from external vaults without exposing secrets to agents, PII, PHI, and card data redaction from API responses before reaching the agent. Lunar.dev MCP Gateway (MCPX) differentiates with Centralized MCP server registry with service discovery for local and remote servers, Role-based access control (RBAC) with per-agent tool restrictions and on-behalf-of attribution, Authentication to MCP servers via API keys or OAuth.

KeyRunner is developed by KeyRunner. Lunar.dev MCP Gateway (MCPX) is developed by Lunar.dev. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

KeyRunner integrates with Claude, ChatGPT, Cursor, HashiCorp Vault, 1Password and 10 more. Lunar.dev MCP Gateway (MCPX) integrates with Okta, Azure AD, Lunar.dev AI Gateway. Check integration compatibility with your existing security stack before deciding.

KeyRunner and Lunar.dev MCP Gateway (MCPX) serve similar Agentic AI Security use cases: both are Agentic AI Security tools, both cover MCP Security, Agentic AI Security, AI Gateway. Review the feature comparison above to determine which fits your requirements.