Finance
APR Calculator
Calculate the true Annual Percentage Rate (APR) of a loan when upfront fees are involved. The nominal interest rate sets the monthly payment, but fees reduce the net cash received, raising the effective APR. Uses Newton's method to solve the annuity present-value equation. Shows APR, nominal rate, monthly payment, and the APR premium.
Quick start
Call this tool from your code in three languages.
curl -X POST 'https://api.elysiatools.com/en/api/tools/apr-calculator' \
-H 'Content-Type: application/json' \
-d '{"loanAmount":20000,"nominalRate":6.5,"termMonths":60,"upfrontFees":500,"feeFinanced":false,"decimalPlaces":2}'API reference
Send a POST request with your inputs as JSON. File parameters require a separate upload first.
Endpoint
POST https://api.elysiatools.com/en/api/tools/apr-calculatorParameters
| Name | Type | Required | Description |
|---|---|---|---|
| loanAmount | number | Yes | — |
| nominalRate | number | Yes | — |
| termMonths | number | Yes | — |
| upfrontFees | number | No | — |
| feeFinanced | checkbox | No | — |
| decimalPlaces |
MCP integration
Add this tool to your Model Context Protocol server so AI agents can list and call it.
Server configuration
Add this block to your MCP client configuration:
{
"mcpServers": {
"elysiatools-apr-calculator": {
"name": "apr-calculator",
"description": "Calculate the true Annual Percentage Rate (APR) of a loan when upfront fees are involved. The nominal interest rate sets the monthly payment, but fees reduce the net cash received, raising the effective APR. Uses Newton's method to solve the annuity present-value equation. Shows APR, nominal rate, monthly payment, and the APR premium.",
"baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=apr-calculator",
"command": "",
"args": [],
"env": {},
"isActive": true,
"type": "sse"
}
}
}List available tools
After connecting to the SSE endpoint, list the exposed tools:
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/list"
}Call this tool
Invoke the tool by its id, passing arguments built from its parameters:
{
"jsonrpc": "2.0",
"id": 2,
"method": "tools/call",
"params": {
"name": "apr-calculator",
"arguments": {
"loanAmount": 20000,
"nominalRate": 6.5,
"termMonths": 60,
"upfrontFees": 500,
"feeFinanced": false,
"decimalPlaces": 2
}
}
}