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Compound Interest Calculator with Monthly Contributions
x402
Compound Interest Calculator with Monthly Contributions is a paid API for AI agents from agent-data-tools.revmesh2074.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).
Calculates the future value of savings or investments with compound interest, optional monthly contributions, and a year-by-year balance breakdown.
Price / call$0.01
Success—
StatusUnknown
How this service works
Compound interest on savings or an investment: starting amount, annual rate, years, compounding (yearly, quarterly, monthly or daily) and an optional contribution at the end of each month. Returns the future value, total contributed, interest earned and the balance after each year. Use for savings goals and investment what-ifs; rates are assumed constant.
Output
Returns a JSON object with the final future value (futureValue), total amount contributed including principal (totalContributions), total interest earned (interestEarned), and a byYear array showing the running balance at the end of each year throughout the investment period.
Example use cases
Retirement savings growth projection
“I have $20,000 in retirement savings and plan to add $500 every month. If I get a 7% annual return compounded monthly, how much will I have after 30 years?”
College fund planning
“I want to start a college fund with $2,000 today and add $150 a month. At 4.5% interest compounded quarterly, how much will I have in 18 years?”
High-yield savings account what-if
“If I put $10,000 in a high-yield savings account earning 5.1% compounded daily and don't add anything, what's the balance year by year over 5 years?”
Technical details
Endpoint
GEThttps://agent-data-tools.revmesh2074.workers.dev/calc/compound-interest?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to model savings or investment growth over time with a fixed interest rate, optional regular monthly deposits, and flexible compounding frequency. It is ideal for personal finance projections, retirement planning, college fund estimates, and savings goal what-ifs. Prefer this over simple interest calculators when compounding and periodic contributions matter to the result.
Side effects
- Missing required fields (principal, rate, or years) returns a validation error
- Rate outside -50 to 100 range is rejected
- Years exceeding 100 is rejected
- Invalid compound frequency string returns an error
- Non-numeric values for numeric fields cause a 400 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| raterequired | number | Annual interest rate in percent, -50 to 100 |
| yearsrequired | number | Years, up to 100 |
| monthly | number | Contribution at the end of each month (default 0) |
| compound | string | yearly, quarterly, monthly (default) or daily |
| principalrequired | number | Starting amount (0 or more) |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| byYear | array | |
| futureValue | number | |
| interestEarned | number | |
| totalContributions | number |
Tags
x402
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