FinCalc API

What it does

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.

Explore your APIs

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  FinCalcJul 2026 · getfincalc.com · ▲4

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• IM
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  It's at http://finkin.com. The goal is to allow a developer to sign up in seconds, and within minutes begin querying data. It runs under https and stores no access information. From http://news.ycombinator.com/item?id=1431583, I realized that all those types of sites are not tailored to developers like the other simple APIs around the web are (i.e. flickr). I made mine as simple as I thought possible. From http://news.ycombinator.com/item?id=1676458, I realized that eventually it should be a scalable model where you pay pennies per the # of requests you make. Right now it supports many…

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  FinanceCalc HubAug 2026 · finance.webtools3.com · ▲3

  Free Online Financial Calculators

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