Compound interest calculator
Compound interest calculator. Projects the ending value of an investment given a starting principal, monthly contributions, and an annual interest rate, compounded monthly over a chosen number of years.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
236 msmedian answer time
$0.01listed price per call
$0.01price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://x402.outpimp.com/compoundInterestCalculator
| Category | Everything else |
|---|---|
| Provider host | x402.outpimp.com |
| Networks | eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 3 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.01 | 236 ms |
Example input (from the provider)
{
"body": {
"annualInterestRate": 0.07,
"initialInvestment": 10000,
"monthlyContribution": 200,
"years": 20
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"annualInterestRate": {
"description": "Annual interest rate, as a fraction (e.g. 0.07).",
"type": "number"
},
"initialInvestment": {
"description": "Starting principal.",
"type": "number"
},
"monthlyContribution": {
"description": "Recurring monthly contribution.",
"type": "number"
},
"years": {
"description": "Number of years to project (1-100).",
"type": "number"
}
},
"required": [
"initialInvestment",
"years",
"monthlyContribution",
"annualInterestRate"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}