Loan and investment calculator in exact cents, no outside source
Loan and investment calculator in exact cents, no outside source. mode=annuity: monthly payment, total interest and the full amortisation schedule (up to 600 months). mode=compound: future value of an initial sum plus monthly contributions. mode=npv or irr: discount or internal rate of return of a list of cashflows (up to 200, the first at time 0). Rates are percentages from 0 to 100 a year (per period for npv and irr); terms up to 50 years.
Answeringour last check, 2026-10-18
1 of 1checks answered this week
32 msmedian answer time
$0.001listed price per call
$0.001price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://api.sitecheck-api.workers.dev/api/finance/loan
| Category | Everything else |
|---|---|
| Provider host | api.sitecheck-api.workers.dev |
| Networks | eip155:5042, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-18 | valid payment request | 402 | $0.001 | 32 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"mode": "annuity",
"principal": "250000",
"rate": "6.5",
"termYears": "30"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"cashflows": {
"description": "Comma-separated cashflows for npv and irr, e.g. -1000,300,400,500 (first at time 0)",
"type": "string"
},
"contribution": {
"description": "Monthly contribution for compound, up to two decimals (optional)",
"type": "string"
},
"mode": {
"description": "annuity (default), compound, npv or irr",
"type": "string"
},
"principal": {
"description": "Loan amount (annuity) or starting sum (compound), up to two decimals (optional for compound)",
"type": "string"
},
"rate": {
"description": "Annual rate in percent, 0 to 100 (annuity, compound); rate per period in percent for npv (-99 to 1000)",
"type": "string"
},
"termMonths": {
"description": "Term in months, 1 to 600, instead of termYears",
"type": "string"
},
"termYears": {
"description": "Term in years, up to 50 (annuity, compound)",
"type": "string"
}
},
"required": [
"mode"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}