What is FinCalc API?
Stop reimplementing financial math. FinCalc API gives developers 8 production-ready REST endpoints: Amortization, Mortgage, Compound Interest, ROI, NPV, IRR, Break-Even, and Depreciation. Returns structured JSON. Inputs as query params. Stateless - no data stored. Sub-50ms responses. Free tier: 50 calls/day. Paid plans from $9.99/mo.
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