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Loan Amortization Schedule Calculator
x402
Loan Amortization Schedule Calculator is a paid API for AI agents from api.24klabs.ai, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).
Generates a full amortization schedule from loan principal, APR, and term, including monthly payment, per-period principal/interest breakdown, running balance, total interest, and payoff date.
Price / call$0.003
Success—
StatusUnknown
How this service works
Full amortization table from principal, APR and term (plus optional extra payment): monthly payment, per-period principal/interest split, running balance, total interest, payoff date.
Output
Returns a complete amortization table with one row per payment period containing the payment number, payment amount, principal portion, interest portion, and remaining balance. Also includes summary fields: total interest paid over the life of the loan, total amount paid, and projected payoff date. Optional extra payment scenarios adjust the schedule accordingly.
Example use cases
Mortgage payoff planning with extra payments
“I have a $450,000 mortgage at 7.1% APR with 25 years left — if I pay an extra $500 per month, show me the full amortization table, total interest I'll save, and my new payoff date.”
Car loan monthly payment breakdown
“I'm taking out a $28,000 car loan at 5.9% APR for 60 months. Can you generate the complete amortization schedule so I can see exactly how much of each monthly payment goes to principal vs interest?”
Personal loan total interest comparison
“I have a $15,000 personal loan at 11.5% APR over 36 months. Generate the full repayment schedule and tell me the total interest I'll pay over the life of the loan and exactly when it's paid off.”
Technical details
Endpoint
POSThttps://api.24klabs.ai/api/loan-amortization-scheduleWhen to prefer
Choose this endpoint when you need a complete, period-by-period amortization breakdown rather than just a monthly payment estimate. Ideal for mortgage planning, car loan analysis, personal loan comparisons, or any scenario where a user wants to visualize how their balance decreases over time, understand the total interest cost, or model the impact of extra payments on payoff date.
Side effects
- Invalid APR (negative or zero) returns validation error
- Loan term of zero or negative months returns error
- Principal amount of zero or negative returns error
- Missing required fields (principal, APR, or term) returns 400-level error
- Extremely large principal or term values may cause computation edge cases
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| apr | number | |
| principal | number | |
| start_date | string | |
| term_years | number | |
| extra_payment | number |
Output
Schema · Response
{
"type": "json",
"example": {
"payoff_months": 300,
"total_interest": 296697,
"monthly_payment": 1580.17
}
}Tags
x402
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