# x402-toolbox Compound Interest Calculator

> x402-toolbox Compound Interest Calculator is a paid API for AI agents from x402-toolbox.shablony-pro.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).

Calculates compound interest for a given principal, rate, and time period, returning deterministic results via a pay-per-call x402 payment on Base.

## Facts

- Endpoint: GET https://x402-toolbox.shablony-pro.workers.dev/math/compound-interest-calculator?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-toolbox-compound-interest-calculator-8bff47f2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JqgMrR1uo7DY8i59CU9-3

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 x402-toolbox-compound-interest-calculator-8bff47f2
```

Example prompt: Can you calculate the compound interest on a $10,000 principal at 5% annual interest rate compounded monthly over 3 years?

## When to prefer this

Choose this endpoint when you need a fast, deterministic, no-signup compound interest computation accessible to AI agents via micro-payment on Base. Ideal when no API key management is desired and the agent can autonomously handle x402 USDC payments on Base.

## Known failure modes

- Missing or malformed schema parameter returns an error
- Invalid numeric values for rate or principal cause computation failure
- Payment not fulfilled returns 402 Payment Required
- Negative time period or zero principal yields degenerate results

## How this service works

309 deterministic pay-per-call tools for AI agents over x402 (USDC, Base). No signup, no API key: the payment is the identity.

## Output

Returns a JSON object with ok:true and paid:true along with the computed compound interest result, including total accumulated value and interest earned based on the provided principal, rate, frequency, and duration.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "schema": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-toolbox-compound-interest-calculator-8bff47f2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-toolbox.shablony-pro.workers.dev](https://www.zero.xyz/host/x402-toolbox.shablony-pro.workers.dev/llms.txt)