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Loan Payment Calculator (PMT)
x402
Loan Payment Calculator (PMT) is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Computes the periodic payment, total amount paid, and total interest for a fully-amortizing loan given principal, rate, term, and payment frequency — equivalent to Excel's PMT function.
Price / call$0.001
Success—
StatusUnknown
How this service works
Compute the monthly (or per-period) payment on a fully-amortizing loan: mortgage, auto, student loan, business loan. Returns the periodic payment, total paid over the term, and total interest. Matches Excel's PMT(rate, nper, -principal). Use this when you just need the payment number, not the full per-period schedule (see amortization).
Output
Returns the periodic payment amount (e.g. monthly), the total amount paid over the full loan term, and the total interest paid — all derived from the principal, annual rate, term, and payment frequency.
Example use cases
Example prompt
“What would my monthly payment be on a $300,000 mortgage at 6.5% annual interest over 30 years?”
Technical details
Endpoint
POSThttps://agent402.tools/api/loan-paymentWhen to prefer
Use this endpoint when you need a precise, Excel-PMT-compatible loan payment calculation supporting flexible payment frequencies (monthly, bi-weekly, weekly). Prefer it over generic financial calculators when you need the breakdown of total paid vs. total interest, or when working with non-standard payment schedules like bi-weekly (26/year) or weekly (52/year).
Side effects
- Missing required fields (principal, termYears, annualRate) returns a validation error
- Zero or negative principal returns an error
- Interest rate provided as percentage (e.g. 6 instead of 0.06) may produce wildly incorrect results
- paymentsPerYear of 0 causes a division-by-zero or invalid computation error
- Extremely short terms or very high rates may produce unexpectedly large payment values
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| principal | number | Loan principal (positive) |
| termYears | number | Loan term in years |
| annualRate | number | Annual interest rate as decimal (0.06 = 6%) |
| paymentsPerYear | number | Payments per year (12 = monthly, 26 = bi-weekly, 52 = weekly). Default 12. |
Output
Schema · Response
{
"type": "json",
"example": {
"payment": 1199.1,
"periods": 360,
"totalPaid": 431676.38,
"periodicRate": 0.005,
"totalInterest": 231676.38
}
}Tags
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