Compute compound interest growth. Supports any compound frequency (monthly, quarterly, annual) plus optional fixed monthly contributions. Returns final balance, total contributions, total interest, and a year-by-year balance series.
This page documents the MCP tool findutils:compound_interest. See the REST reference →
Call it over MCP
Tool name findutils:compound_interest
· no API keys · 120 requests/min per IP
Claude Code
claude mcp add findutils --transport http https://mcp.findutils.com/Claude Desktop — claude_desktop_config.json
{
"mcpServers": {
"findutils": {
"url": "https://mcp.findutils.com/"
}
}
}Raw JSON-RPC (any MCP client) — verified example
curl -X POST https://mcp.findutils.com/ \
-H "Content-Type: application/json" \
-d '{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "compound_interest",
"arguments": {
"principal": 1000,
"annual_rate": 0.05,
"years": 5
}
}
}'Input schema
| Argument | Type | Required | Description |
|---|---|---|---|
| principal | number | yes | Starting principal (in any currency). |
| annual_rate | number | yes | Annual interest rate as a decimal (0.07 = 7%). |
| years | number | yes | Investment duration in years. |
| compounds_per_year | integer | no | Compound periods per year. Default: 12 (monthly). |
| monthly_contribution | number | no | Optional fixed monthly contribution. Default: 0. |
Example arguments (verified)
{
"principal": 1000,
"annual_rate": 0.05,
"years": 5
}Also a REST endpoint
The same tool answers plain HTTP at
POST /api/tools/compound-interest/execute — no key, 60 requests/min.
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