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Finance Calculators – Loan Payment & Amortization
x402
Finance Calculators – Loan Payment & Amortization is a paid API for AI agents from finance-calculators.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-31).
Calculates monthly (or custom-frequency) loan payment, total interest, total paid, and an amortization preview given principal, annual rate, and term.
Price / call$0.02
Success—
StatusUnknown
How this service works
Loan payment, total interest and amortization preview from principal, annual rate and term, monthly or other frequency.
Output
Returns a structured object with: the periodic payment amount, total number of payments, total amount paid, total interest paid, interest as a percentage of principal, a human-readable summary, a disclaimer, and an array showing the first and last amortization entries (with balance, payment, interest, and principal components for each).
Example use cases
Monthly mortgage payment estimate
“I'm looking at a home priced at $450,000 and putting 20% down, financing the rest at 7.1% over 30 years — what's my monthly mortgage payment and how much interest will I pay over the life of the loan?”
Car loan total cost check
“If I borrow $28,000 for a car at 5.9% annual interest for 5 years with monthly payments, what will my payment be and how much will I pay in interest overall?”
Bi-weekly payment comparison
“Calculate the payment on a $180,000 student loan consolidation at 4.5% over 20 years using 26 payments per year instead of monthly — I want to see the total interest and what the first and last payments look like.”
Technical details
Endpoint
GEThttps://finance-calculators.x402tookit.com/loan-payment?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, accurate loan payment and total-interest estimate with an amortization preview — especially when the user supplies principal, rate, and term and wants both the periodic payment and the full interest cost. It supports non-monthly payment frequencies (bi-weekly, etc.) which many simple calculators omit. Prefer this over general financial APIs when you specifically need amortization breakdown data alongside the payment figure.
Side effects
- Missing required parameters (principal, annual_rate_pct, years) returns an error
- Non-positive or zero principal or rate may yield invalid results
- Extremely short terms or very high rates may produce edge-case outputs
- Network or payment (x402) authentication failure results in no response
- payments_per_year of 0 or negative would cause division errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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