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Simple and Compound Interest Calculator
x402
Simple and Compound Interest Calculator is a paid API for AI agents from finance.openverbs.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-15).
Calculates the final amount after growing a principal by simple or compound interest over a specified number of years, with configurable compounding frequency.
Price / call$0.004
Success—
StatusUnknown
How this service works
Grow a principal by simple or compound interest over a number of years. Compound interest uses compoundsPerYear compounding periods (default 12, monthly).
Output
Returns the grown principal amount after applying simple or compound interest over the specified period, reflecting the starting principal, annual rate, number of years, and compounding frequency.
Example use cases
Savings account growth projection
“I have $15,000 in a savings account earning 4.2% annual interest compounded monthly. How much will I have after 5 years?”
Simple interest loan cost estimate
“Calculate the simple interest on a $50,000 loan at 7% per year over 3 years — I want to know the total amount I'd owe at the end.”
Retirement nest egg compounding
“If I put $100,000 into an account earning 8% per year compounded quarterly, what will it be worth in 30 years?”
Technical details
Endpoint
POSThttps://finance.openverbs.com/v1/interestWhen to prefer
Use this endpoint when you need a straightforward interest growth calculation given a fixed annual rate, principal, and time period — either simple or compound. Prefer this over future value or NPV endpoints when you are not dealing with recurring cash flows or annuities, just a lump sum growing at a fixed rate. Ideal for savings projections, loan interest estimates, and basic investment modeling.
Side effects
- Missing required fields (principal, annualRatePercent, years) returns a validation error
- Years or rate exceeding maximum bounds (1000 years, 1000% rate) returns a range error
- Invalid method enum value (not 'simple' or 'compound') returns a schema validation error
- compoundsPerYear outside 1–365 range returns a validation error
- Non-numeric input for numeric fields returns a type error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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