Hey,
We're building Portkey AI in a similar space but with a different focus. We've open-sourced our gateway that routes to any LLM provider (OpenAI, Anthropic, etc.) using your own API keys.
While you're going for the monthly fee model, we've found that enterprises really value features like:
Detailed observability and analytics for each request
Governance over AI usage, RBAC
Semantic caching to reduce API costs, budget limits
Compliance tools (PII redaction, audit logs, SSO)