For the complete documentation index, see llms.txt.
Calculate future value from a lump sum plus optional recurring contributions.
One POST adds Future Value Calculator to your app, site, workflow, or agent — formula, validation, edge cases, and docs already handled.
prefer a UI? Open the Future Value Calculator on miniwebtool.com →
POST https://api.miniwebtool.com/v1/tools/future-value-calculator/run
| Field | Type | Req. |
|---|---|---|
present_value
|
float |
✓ |
annual_rate_percent
|
float |
✓ |
years
|
float |
✓ |
compound_frequency
annually | semiannually | quarterly | monthly | daily
|
str |
— |
contribution
|
float |
— |
contribution_frequency
annually | quarterly | monthly
|
str |
— |
precision
|
int |
— |
65536 bytes.hash_only{
"request_id": "01K...",
"tool": "future-value-calculator",
"tool_version": "2026-04-22",
"credits_used": 2,
"result": { ... }
}
curl -X POST https://api.miniwebtool.com/v1/tools/future-value-calculator/run \
-H 'Authorization: Bearer mwt_live_YOUR_KEY' \
-H 'Content-Type: application/json' \
-d '{"present_value":10000,"annual_rate_percent":7,"years":10,"compound_frequency":"monthly","contribution":100,"contribution_frequency":"monthly"}'
import requests
resp = requests.post(
'https://api.miniwebtool.com/v1/tools/future-value-calculator/run',
headers={'Authorization': 'Bearer mwt_live_YOUR_KEY'},
json={'present_value': 10000, 'annual_rate_percent': 7, 'years': 10, 'compound_frequency': 'monthly', 'contribution': 100, 'contribution_frequency': 'monthly'},
)
resp.raise_for_status()
print(resp.json())
const resp = await fetch(
'https://api.miniwebtool.com/v1/tools/future-value-calculator/run',
{
method: 'POST',
headers: {
'Authorization': 'Bearer mwt_live_YOUR_KEY',
'Content-Type': 'application/json',
},
body: JSON.stringify({"present_value":10000,"annual_rate_percent":7,"years":10,"compound_frequency":"monthly","contribution":100,"contribution_frequency":"monthly"}),
}
);
const data = await resp.json();
console.log(data);
<?php
$ch = curl_init('https://api.miniwebtool.com/v1/tools/future-value-calculator/run');
curl_setopt_array($ch, [
CURLOPT_POST => true,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_HTTPHEADER => [
'Authorization: Bearer mwt_live_YOUR_KEY',
'Content-Type: application/json',
],
CURLOPT_POSTFIELDS => json_encode([
'present_value' => 10000,
'annual_rate_percent' => 7,
'years' => 10,
'compound_frequency' => 'monthly',
'contribution' => 100,
'contribution_frequency' => 'monthly'
]),
]);
$resp = curl_exec($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/future-value-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 = {
'present_value' => 10000,
'annual_rate_percent' => 7,
'years' => 10,
'compound_frequency' => 'monthly',
'contribution' => 100,
'contribution_frequency' => 'monthly'
}.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{}{
"present_value": 10000,
"annual_rate_percent": 7,
"years": 10,
"compound_frequency": "monthly",
"contribution": 100,
"contribution_frequency": "monthly",
})
req, _ := http.NewRequest("POST", "https://api.miniwebtool.com/v1/tools/future-value-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/future-value-calculator/run"))
.header("Authorization", "Bearer mwt_live_YOUR_KEY")
.header("Content-Type", "application/json")
.POST(HttpRequest.BodyPublishers.ofString("{\"present_value\":10000,\"annual_rate_percent\":7,\"years\":10,\"compound_frequency\":\"monthly\",\"contribution\":100,\"contribution_frequency\":\"monthly\"}"))
.build();
var resp = client.send(req, HttpResponse.BodyHandlers.ofString());
System.out.println(resp.body());
present_value, annual_rate_percent, years, . See the Request body table above for the full schema.
https://api.miniwebtool.com/v1/tools/future-value-calculator/run
Authorization: Bearer <key> and Content-Type: application/json. Copy-paste snippets in 7 languages are under Code examples.
{request_id, tool, tool_version, credits_used, result}. The typed output lives in result.
Calculate future value from a lump sum plus optional recurring contributions. Use it to add this utility without rebuilding formulas, validation, examples, and documentation.
2 credits per successful call. Failed calls (validation errors, 5xx) don't bill.
Required fields: present_value, annual_rate_percent, years. Full schema at /v1/openapi.json.
Yes — same input, same output, forever. Tool version 2026-04-22; output shape is stable within a major version.
Yes. Connect to https://api.miniwebtool.com/v1/mcp over the Model Context Protocol. The agent discovers `future-value-calculator` with its JSON Schema automatically, so the model can plan while MiniWebtool handles the exact tool result.
JSON with a stable envelope: `{request_id, tool, tool_version, credits_used, result}`. Errors are RFC 7807 `application/problem+json`.
Every endpoint on this site is also exposed via the
Model Context Protocol at
https://api.miniwebtool.com/v1/mcp.
Claude, Cursor, and any MCP-capable agent can discover this tool
(future-value-calculator)
and its JSON Schema automatically — no client codegen.
# List tools the agent can call
curl -s https://api.miniwebtool.com/v1/mcp \
-H 'Content-Type: application/json' \
-d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}' \
| jq '.result.tools[] | select(.name=="future-value-calculator")'