Package financial calculator functionality as an embeddable API. Many apps need core finance math but don't want to build it themselves.
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The persistence of paid calculator apps shows strong demand for reliable financial math tools.
Developers building finance apps often recreate the same complex calculations like amortizations and NPV.
Offer these as a microservice with clean, well-documented APIs covering all major financial formulas.
Monetize through monthly active user tiers.
Start with the 10 most common calculations used in existing apps.
Risk: Relatively easy for competitors to replicate.
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