tiun

tiun (written "tiun." by the company) gives AI and SaaS companies one backend in place of separate tools for sign-in, billing and customer data. Authentication covers sign-up and login, multi-factor codes by SMS or email, social single sign-on and ready-made account and profile components. Payments cover one-time, subscription, usage-based and time-based pricing with drop-in checkout components, and tiun acts as Merchant of Record: it processes the payments, handles tax compliance and chargebacks, and pays out monthly. A customer database keeps each user's subscription status with their profile, alongside event and session tracking, transactional emails, invoices and a self-serve portal where customers change or cancel their plan. Developers can install it by adding tiun's skills and connecting its MCP server so a coding agent does the integration. The platform itself is free: on the standard plan, payments cost 2.9% + $0.30 per transaction, with a further 0.5% on subscription payments and $15 per dispute, and AI-native analytics is a $17 a month add-on; Enterprise rates are custom. tiun is operated by TIUN AG and says it is hosted in Europe.