Answers
Practical answers for
building an AI product
Common questions about building an app that people pay for: hosting it, going live, getting paid and adding AI.
Your site
Host your app on Gemmein
A private preview while you build, every version kept, and your live site at its own address once you go live.
Your site
Put your site on your own domain
Show your live site at www.yourshop.com. Add the domain, add two records, and Gemmein sets up the rest.
Building
Build your app in ChatGPT or Claude
Add Gemmein once, then say what you want in plain words. Every ChatGPT plan works, Free included.
Going live
Going live: approve, then pay
Approve in your browser, then pay for your plan. No code is needed, and building stays free.
AI monetisation
How to charge credits for AI features
Price a named tool on the server. Gemmein spends a per-call price up front, or settles a per-token price at actual usage.
AI monetisation
How to monetise AI features
Sell credits that tools spend, or put premium tools behind a paid plan. Stripe is built in, any provider that signs its webhooks to a supported standard connects through a relay, and the money goes to your own account.
AI usage
How to rate-limit AI usage per user
Cap usage with credits, so each person runs only what their balance covers. Choose which plans and products can use a tool, on top of built-in abuse limits.
AI security
How to store your OpenAI key server-side
Keep your provider key out of the browser. Paste it once in the dashboard, and your app calls the tool by name.
Auth & data
Passwordless auth for an AI app
Sign-in codes by email, no passwords, and eight server-enforced safety rules that keep each person's data separate.
Auth & data
Row-level security in plain English
What RLS means, why SQL policies are easy to get wrong, and the eight server-enforced safety rules that replace them.
Backend for agents
How to launch an agentic product
Run your own agent behind an external tool. Gemmein sends it a signed run with a credit ceiling and keeps the result for the person.
Going live
The backend for a vibe-coded app
Keep your front end. Add sign-in, protected data, payments and server-side AI so people can sign in and pay.
Support & operations
Customer support in a Gemmein app
Replies to your app's emails arrive as threads in the dashboard's Inbox, on your own domain. From the Customers page you can email, suspend, sign out or delete a person.
The product
Product overview
Hosting, sign-in, data, payments, credits, AI and automations, on one page.
For coding agents
The builder guide
The llms.txt file your coding agent reads to check whether Gemmein fits your app, then to build with it.
Add Gemmein to your AI. Then tell it what you want.
Building is free. No card until you go live.