Debt payoff calculator
Debt payoff calculator - payoff months, total interest and impossible-payment flag from balance, APR and payment
Answeringour last check, 2026-10-20
1 of 1checks answered this week
408 msmedian answer time
$0.01listed price per call
$0.01price 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://saylorinnovations.com/api/debt/payoff
| Category | Market data |
|---|---|
| Provider host | saylorinnovations.com |
| Networks | eip155:137, eip155:42161, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 0 from 0 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-20 | valid payment request | 402 | $0.01 | 408 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"apr_percent": "18",
"extra_payment": "50",
"monthly_payment": "300",
"principal": "10000"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"apr_percent": {
"description": "required annual percentage rate, 0 or greater (query)",
"type": "string"
},
"extra_payment": {
"description": "optional non-negative extra monthly payment (query)",
"type": "string"
},
"monthly_payment": {
"description": "required positive scheduled monthly payment (query)",
"type": "string"
},
"principal": {
"description": "required positive balance (query)",
"type": "string"
}
},
"required": [
"principal",
"apr_percent",
"monthly_payment"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"apr_percent": {
"description": "Apr, as a percentage",
"type": "number"
},
"extra_payment": {
"description": "Extra payment",
"type": "number"
},
"first_month_interest": {
"description": "First month interest",
"type": "number"
},
"formula": {
"description": "Formula used for the calculation",
"type": "string"
},
"monthly_payment": {
"description": "Monthly payment amount",
"type": "number"
},
"payoff_months": {
"description": "Payoff months",
"type": "number"
},
"payoff_possible": {
"description": "Payoff possible",
"type": "boolean"
},
"principal": {
"description": "Starting principal amount",
"type": "number"
},
"scope_note": {
"description": "What this data covers and what it leaves out",
"type": "string"
},
"total_interest": {
"description": "Total interest",
"type": "number"
},
"total_paid": {
"description": "Total paid",
"type": "number"
}
},
"required": [
"principal",
"apr_percent",
"monthly_payment",
"extra_payment",
"payoff_possible"
],
"type": "object"
},
"type": {
"const": "json",
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}