SiteCheck Finance Loan Calculator

x402

SiteCheck Finance Loan Calculator is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-16).

Computes loan amortization schedules, compound growth, NPV, and IRR using pure financial math — returning a full month-by-month breakdown of payments, interest, and balance.

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

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Output

A JSON object containing the calculation mode, interest rate, number of months, monthly payment amount, last payment (may differ slightly due to rounding), total paid, total interest, a full month-by-month schedule (each entry with month number, remaining balance, payment, interest portion, and principal portion), a source note confirming pure-code computation, a disclaimer, and a checkedAt timestamp.

Example use cases

Mortgage payment planning

“I'm buying a house for $400,000 with a 20% down payment. Can you calculate the monthly mortgage payment and total interest I'd pay on a 30-year annuity loan at 7.2% annual interest?”

Investment compound growth projection

“If I invest $15,000 today and add $200 a month, how much will I have after 20 years assuming 7% annual compound growth?”

Project IRR evaluation

“Calculate the IRR for a project where I invest $50,000 upfront and expect cashflows of $10,000, $15,000, $20,000, and $25,000 over the next four years.”

Technical details

Endpoint

GEThttps://api.sitecheck-api.workers.dev/api/finance/loan?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need server-side loan amortization, compound interest projection, NPV, or IRR computation without implementing the math yourself. It is ideal for agents embedded in financial planning, mortgage advisory, or investment analysis workflows. It runs pure-code computation (no external data source) making results reproducible and deterministic. At $0.001 per call it is extremely cost-effective for on-demand financial calculations.

Side effects

Missing required 'mode' parameter returns an error
Invalid or out-of-range rate (e.g. negative or over 100 for annuity) causes a validation error
Conflicting termYears and termMonths parameters may cause unexpected behavior
Cashflows parameter missing for NPV or IRR mode
Principal missing for annuity mode
Term exceeding 50 years or 600 months rejected

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "mode": "annuity",
    "rate": 6.5,
    "months": 360,
    "source": "Computed here in pure code (annuity, monthly compounding, NPV and IRR formulas); no outside source",
    "schedule": [
      {
        "month": 1,
        "balance": 249774,
        "payment": 1580.17,
        "interest": 1354.17,
        "principal": 226
      },
      {
        "month": 2,
        "balance": 249546.77,
        "payment": 1580.17,
        "interest": 1352.94,
        "principal": 227.23
      },
      {
        "month": 3,
        "balance": 249318.31,
        "payment": 1580.17,
        "interest": 1351.71,
        "principal": 228.46
      }
    ],
    "checkedAt": "2026-10-15T13:40:01.487Z",
    "principal": 250000,
    "totalPaid": 568861.58,
    "disclaimer": "Information only, not financial advice.",
    "lastPayment": 1580.55,
    "totalInterest": 318861.58,
    "monthlyPayment": 1580.17
  }
}

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