# Sindri Compound Interest Calculator

> Sindri Compound Interest Calculator is a paid API for AI agents from x402.outpimp.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

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.

## Facts

- Endpoint: POST https://x402.outpimp.com/compoundInterestCalculator
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sindri-compound-interest-calculator-3fd83bb1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RRK3PD3EjCD5-XGaAOv-H

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability sindri-compound-interest-calculator-3fd83bb1 -d '<json body>'
```

Example prompt: If I start with $5,000, contribute $300 a month, and earn 7% annual interest compounded monthly, how much will I have after 25 years?

## When to prefer this

Choose this endpoint when you need a fast, affordable ($0.01 USDC) server-side compound interest projection with monthly compounding and recurring contribution support. Ideal for financial planning agents that need accurate future-value calculations without implementing the math locally. Prefer this over a Coast FIRE or Emergency Fund calculator when the user wants a straightforward investment growth projection rather than a specific FIRE milestone or expense runway.

## Known failure modes

- Missing required parameters (years, initialInvestment, annualInterestRate, or monthlyContribution) may return an error or incomplete result
- Out-of-range values (e.g. years > 100 or negative amounts) may cause unexpected results
- Payment failure via x402 protocol (insufficient USDC balance) will prevent the call from completing
- Providing annualInterestRate as a percentage (e.g. 7 instead of 0.07) will yield incorrect projections

## How this service works

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.

## Output

Returns the projected ending value of the investment after the specified number of years, computed using monthly compounding on both the initial principal and the recurring monthly contributions.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "years": {
   "type": "number",
   "description": "Number of years to project (1-100)."
  },
  "initialInvestment": {
   "type": "number",
   "description": "Starting principal."
  },
  "annualInterestRate": {
   "type": "number",
   "description": "Annual interest rate, as a fraction (e.g. 0.07)."
  },
  "monthlyContribution": {
   "type": "number",
   "description": "Recurring monthly contribution."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sindri-compound-interest-calculator-3fd83bb1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.outpimp.com](https://www.zero.xyz/host/x402.outpimp.com/llms.txt)