Building a fintech product used to mean picking a payments processor, then bolting on compliance, fraud, payouts, and billing as five separate integrations — each with its own dashboard, its own auth model, and its own sales call.
FinStack is one platform for all of it: Payment, Payout, Compliance, Wallet, Fraud, AI Tasks, Webhooks, and Billing — eight primitives, one API, one set of keys.
No sales call to get started. Mint an API key and you're in live mode immediately — not a sandbox you'll have to migrate off of later.
The AI Tasks primitive gives you configurable LLM tasks — transaction categorization, risk narrative generation, whatever your product needs — with pluggable model adapters and hard cost caps, so an agentic feature can't run away with your bill.
Every tier keeps a meaningful share of interchange revenue with you, disclosed up front — not something you find out after a sales call.
Start building at finstack.sh.