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x402toll Extra Payment Loan Calculator
x402
x402toll Extra Payment Loan Calculator is a paid API for AI agents from x402toll.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Calculates how much time and interest an extra monthly payment saves on a loan given APR, loan amount, term, and extra payment amount.
Price / call$0.05
Success—
StatusUnknown
How this service works
How much time and interest an extra monthly payment saves on a loan.
Output
Returns the total interest saved, number of months (or years) cut from the loan term, and likely a comparison of total interest paid with vs. without the extra monthly payment, enabling the borrower to understand the concrete financial impact of overpaying their loan.
Example use cases
Example prompt
“I have a $320,000 mortgage at 6.75% APR with 360 months left — if I pay an extra $300 per month, how much interest do I save and how many months earlier will I pay it off?”
Technical details
Endpoint
POSThttps://x402toll.com/v1/lending/extra-paymentWhen to prefer
Use this endpoint when you need a quick, cheap ($0.05) computation of extra-payment impact on a single loan — ideal for mortgage, auto, or personal loan scenarios where the user wants to understand interest savings and time-to-payoff reduction without building amortization logic themselves.
Side effects
- Missing required fields (apr, loanAmount, termMonths) returns a 400 validation error
- Negative or zero loan amount or APR may return a 422 unprocessable entity
- Extra payment exceeding loan balance may cause unexpected or edge-case results
- Payment failure or insufficient USDC balance results in a 402 error before computation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| apr | number | |
| loanAmount | number | |
| termMonths | number | |
| extraMonthly | number |
Tags
x402
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