Solve the true APR and effective annual rate of a loan from amount, level paymen
Solve the true APR and effective annual rate of a loan from amount, level payment, number of payments and upfront fees, with total cost of credit.
Answeringour last check, 2026-10-20
1 of 1checks answered this week
296 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/finance/apr-from-payment
| Category | Everything else |
|---|---|
| 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 | $0.01 | 296 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"loan_amount": "10000",
"months": "36",
"payment": "325",
"upfront_fees": "300"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"loan_amount": {
"description": "amount borrowed",
"type": "string"
},
"months": {
"description": "number of payments",
"type": "string"
},
"payment": {
"description": "level monthly payment",
"type": "string"
},
"upfront_fees": {
"description": "optional fees deducted from the proceeds",
"type": "string"
}
},
"required": [
"loan_amount",
"payment",
"months"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"amount_received": {
"description": "Loan amount minus upfront fees",
"type": "number"
},
"apr_percent": {
"description": "Monthly rate times twelve, in percent",
"type": "number"
},
"cost_per_100_borrowed": {
"description": "Cost of credit per 100 received",
"type": "number"
},
"effective_annual_rate_percent": {
"description": "Annual rate with monthly compounding",
"type": "number"
},
"loan_amount": {
"description": "Amount borrowed",
"type": "number"
},
"monthly_rate_percent": {
"description": "Solved monthly interest rate",
"type": "number"
},
"months": {
"description": "Number of payments",
"type": "number"
},
"note": {
"description": "Plain-language caveat about how to read and use the result",
"type": "string"
},
"payment": {
"description": "Level monthly payment",
"type": "number"
},
"source": {
"description": "Where the data or formula comes from",
"type": "string"
},
"total_cost_of_credit": {
"description": "Total paid minus amount received",
"type": "number"
},
"total_paid": {
"description": "Payment times months",
"type": "number"
},
"upfront_fees": {
"description": "Fees taken from the proceeds",
"type": "number"
}
},
"required": [
"apr_percent",
"total_cost_of_credit"
],
"type": "object"
},
"type": {
"const": "json",
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}