Finance
Estimate investment doubling time using the Rule of 72 and other investment rules
Call this tool from your code in three languages.
curl -X POST 'https://api.elysiatools.com/en/api/tools/rule-of-72' \
-H 'Content-Type: application/json' \
-d '{"interestRate":8,"principal":10000,"mode":"doubling-time"}'Send a POST request with your inputs as JSON. File parameters require a separate upload first.
POST https://api.elysiatools.com/en/api/tools/rule-of-72| Name | Type | Required | Description |
|---|---|---|---|
| interestRate | number | Yes | — |
| principal | number | Yes | — |
| mode | select | Yes | — |
JSON result
{
"key": {...},
"metadata": {
"key": "value"
},
"error": "Error message (optional)",
"message": "Notification message (optional)"
}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-rule-of-72": {
"name": "rule-of-72",
"description": "Estimate investment doubling time using the Rule of 72 and other investment rules",
"baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=rule-of-72",
"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": "rule-of-72",
"arguments": {
"interestRate": 8,
"principal": 10000,
"mode": "doubling-time"
}
}
}Questions or issues? Contact [email protected]