Build fintech products in hours
10 composable payment primitives. One REST API. Ship faster.
What is FinStack?
Section titled “What is FinStack?”FinStack is an AI-native developer platform for financial services. It provides composable primitives — payments, customers, fraud, receipts, tax, and more — that developers wire together to build fintech products.
| Primitive | Description | |---|---| | Payment | Charge, capture, cancel, and refund payments | | Customer | Store and manage customer profiles | | Fraud | Risk scoring and fraud prevention | | Receipt | Generate and deliver payment receipts | | Tax | Sales tax calculation | | Ledger | Double-entry accounting ledger |
Quick links
Section titled “Quick links”- Quick Start — make your first API call in 5 minutes
- Authentication — API keys and OAuth
- Payments guide — charge, capture, cancel, refund
- API Reference — full endpoint reference