A Metered AI Gateway is the backend infrastructure that lets a SaaS business add AI features (chat, content generation, AI agents) to its product and bill for them by actual usage, without building provider integrations, cost tracking, or a licensing system from scratch.

I design, build, and deploy this infrastructure end to end for SaaS founders and product teams, tailored to your product's stack, scale, and business model.

Multi-provider AI routing : Requests route across leading AI providers such as OpenAI, Anthropic (Claude), and Google Gemini, with automatic fallback if a provider fails, rate-limits, or goes down.

License and subscription-based access control : Server-side logic gates your customers' AI usage by their actual plan (Free, Pro, Agency, Enterprise), never hardcoded into your app.

Usage metering and quota enforcement : Every request is logged by tokens, cost, model, and customer, so you always know your real AI margin per plan.

Secure key management : Your provider API keys never reach the client. I implement short-lived, cryptographically signed access tokens (Ed25519), so a leaked credential can never be used to run up your AI bill.

Security-first architecture : Multi-tenant systems fail most often through authorization gaps, one customer accidentally able to see another's keys or usage. I bring hands-on vulnerability research experience (SSRF and DNS-rebinding/TOCTOU mitigation, IDOR prevention) directly into how this system is designed and reviewed.

Admin control panel : A dashboard where you manage providers, models, routing rules, and customer plans without redeploying code.

Full ownership, no lock-in : Built on self-hosted, open-source-backed infrastructure paired with a custom licensing and subscription control plane, so you own the infrastructure, the data, and the margin. No dependency on a third-party AI billing SaaS, and no dependency on me to keep it running after handoff.

Best fit for SaaS founders, product teams, and technical leads who want to monetize AI features with metered or tiered pricing, and want one engineer who can own the whole build end to end.