Finance
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.
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}'Send a POST request with your inputs as JSON. File parameters require a separate upload first.
POST https://api.elysiatools.com/en/api/tools/apr-calculator| Name | Type | Required | Description |
|---|---|---|---|
| loanAmount | number | Yes | — |
| nominalRate | number | Yes | — |
| termMonths | number | Yes | — |
| upfrontFees | number | No | — |
| feeFinanced | checkbox | No | — |
| decimalPlaces |
Add this tool to your Model Context Protocol server so AI agents can list and call it.
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"
}
}
}After connecting to the SSE endpoint, list the exposed tools:
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/list"
}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
}
}
}| number |
| No |
| — |
HTML result
{
"result": "<div>Processed HTML content</div>",
"error": "Error message (optional)",
"message": "Notification message (optional)",
"metadata": {
"key": "value"
}
}Questions or issues? Contact [email protected]