Lead generation agencyFull-stack build, in production

McGen Digital

Turned an untraceable cost center into a live billing platform running real money.

$8,000+ processed · 14 active users

THE SITUATION

McGen had already sold multiple clients on AI voice agents — a strong offer on its own. But every agent ran through McGen's own accounts across ElevenLabs, Vapi, and Twilio. With several clients sharing the same underlying accounts, there was no reliable way to see which client was driving which cost. Billing became guesswork: either McGen absorbed costs it couldn't trace, or under-billed clients who were using the service heavily. Both quietly erode margin the moment you scale past a handful of clients.

WHAT I BUILT

Usage tracking engine

Tracks consumption per client in real time across ElevenLabs, Vapi, and Twilio, tying every cost back to the exact account driving it.

Next.js · Supabase · provider APIs

McGen admin portal overview screen showing total billed, raw provider cost, margin earned and active client count, above a weekly revenue chart broken out by Vapi/ElevenLabs, TNZ and Twilio — The number that used to be unknowable: raw provider cost split by platform, sat next to what was actually billed. Margin is now a figure on a dashboard rather than an end-of-month guess.

Automated billing pipeline

Handles the full billing cycle — invoicing, failed card retries, negative balance handling, and line items like rented phone numbers.

Stripe · Supabase · Resend

Client dashboard

Full frontend and backend so McGen and their clients can see usage and charges without anyone pulling reports manually.

Next.js · Supabase Auth

WHAT CHANGED

What used to be an unbillable black box is now a live production system serving 14 active users and processing over $8,000 in client billing. McGen can keep adding voice AI clients without the backend cost problem scaling right alongside them.