What does the Simple Interest Calculator API do?

Simple-interest formula: I = P * r * t. Use it when you need exact JSON instead of asking an LLM to recreate well-defined utility logic.

How much does one call to Simple Interest Calculator cost?

2 credits per successful call. Failed calls (validation errors, 5xx) don't bill.

What parameters does the Simple Interest Calculator API require?

Required fields: principal, annual_rate_percent, years. Full schema at /v1/openapi.json.

Is the Simple Interest Calculator API deterministic?

Yes — same input, same output, forever. Tool version 2026-04-22; output shape is stable within a major version.

Can an AI agent call the Simple Interest Calculator API?

Yes. Connect to https://api.miniwebtool.com/v1/mcp over the Model Context Protocol. The agent discovers `simple-interest-calculator` with its JSON Schema automatically, so the model can plan while MiniWebtool handles the exact tool result.

What format does the API return?

JSON with a stable envelope: `{request_id, tool, tool_version, credits_used, result}`. Errors are RFC 7807 `application/problem+json`.

Simple Interest Calculator API

Endpoint

POST https://api.miniwebtool.com/v1/tools/simple-interest-calculator/run

Request body

Field	Type	Req.
`principal`	`float`	✓
`annual_rate_percent`	`float`	✓
`years`	`float`	✓

Cost & access

2 credits per successful call.
Max payload: 65536 bytes.
Privacy mode: hash_only
Available on: starter, pro, business, scale

Response envelope

{
  "request_id": "01K...",
  "tool": "simple-interest-calculator",
  "tool_version": "2026-04-22",
  "credits_used": 2,
  "result": { ... }
}

Try it

Response

Response headers

Code examples

curl -X POST https://api.miniwebtool.com/v1/tools/simple-interest-calculator/run \
  -H 'Authorization: Bearer mwt_live_YOUR_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"principal":1000,"annual_rate_percent":5,"years":3}'

import requests

resp = requests.post(
    'https://api.miniwebtool.com/v1/tools/simple-interest-calculator/run',
    headers={'Authorization': 'Bearer mwt_live_YOUR_KEY'},
    json={'principal': 1000, 'annual_rate_percent': 5, 'years': 3},
)
resp.raise_for_status()
print(resp.json())

const resp = await fetch(
  'https://api.miniwebtool.com/v1/tools/simple-interest-calculator/run',
  {
    method: 'POST',
    headers: {
      'Authorization': 'Bearer mwt_live_YOUR_KEY',
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({"principal":1000,"annual_rate_percent":5,"years":3}),
  }
);
const data = await resp.json();
console.log(data);

<?php
$ch = curl_init('https://api.miniwebtool.com/v1/tools/simple-interest-calculator/run');
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => [
        'Authorization: Bearer mwt_live_YOUR_KEY',
        'Content-Type: application/json',
    ],
    CURLOPT_POSTFIELDS => json_encode([
    'principal' => 1000,
    'annual_rate_percent' => 5,
    'years' => 3
]),
]);
$resp = curl_exec($ch);
curl_close($ch);
print_r(json_decode($resp, true));

require 'net/http'
require 'json'
require 'uri'

uri = URI('https://api.miniwebtool.com/v1/tools/simple-interest-calculator/run')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = (uri.scheme == 'https')

req = Net::HTTP::Post.new(uri)
req['Authorization'] = 'Bearer mwt_live_YOUR_KEY'
req['Content-Type'] = 'application/json'
req.body = {
  'principal' => 1000,
  'annual_rate_percent' => 5,
  'years' => 3
}.to_json

resp = http.request(req)
puts JSON.parse(resp.body).inspect

package main

import (
  "bytes"
  "encoding/json"
  "fmt"
  "io"
  "net/http"
)

func main() {
  body, _ := json.Marshal(map[string]interface{}{
    "principal": 1000,
    "annual_rate_percent": 5,
    "years": 3,
  })
  req, _ := http.NewRequest("POST", "https://api.miniwebtool.com/v1/tools/simple-interest-calculator/run", bytes.NewReader(body))
  req.Header.Set("Authorization", "Bearer mwt_live_YOUR_KEY")
  req.Header.Set("Content-Type", "application/json")

  resp, err := http.DefaultClient.Do(req)
  if err != nil { panic(err) }
  defer resp.Body.Close()
  out, _ := io.ReadAll(resp.Body)
  fmt.Println(string(out))
}

import java.net.URI;
import java.net.http.*;

var client = HttpClient.newHttpClient();
var req = HttpRequest.newBuilder()
    .uri(URI.create("https://api.miniwebtool.com/v1/tools/simple-interest-calculator/run"))
    .header("Authorization", "Bearer mwt_live_YOUR_KEY")
    .header("Content-Type", "application/json")
    .POST(HttpRequest.BodyPublishers.ofString("{\"principal\":1000,\"annual_rate_percent\":5,\"years\":3}"))
    .build();

var resp = client.send(req, HttpResponse.BodyHandlers.ofString());
System.out.println(resp.body());

Simple Interest Calculator

Endpoint

Request body

Cost & access

Response envelope

Try it

Code examples

How to call Simple Interest Calculator

Frequently asked

Use from an AI agent

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