# SignalDesk AI Simple Interest Calculator

> SignalDesk AI Simple Interest Calculator is a paid API for AI agents from x402-agent.kariguetoazul.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-13).

Computes simple interest and total repayment amount from principal, annual rate, and duration in years

## Facts

- Endpoint: POST https://x402-agent.kariguetoazul.workers.dev/api/finance/simple-interest?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signaldesk-ai-simple-interest-calculator-fb42beec
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9q-hyjBy0ctjJgl7IvRCu

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 signaldesk-ai-simple-interest-calculator-fb42beec -d '<json body>'
```

Example prompt: What's the simple interest on a $5,000 principal at 8% annual rate over 3 years — give me both the interest earned and the total amount?

## When to prefer this

Choose this endpoint when you need a fast, deterministic simple-interest computation (P×R×T) from explicitly supplied inputs, without needing compound interest, amortization schedules, or live market rate lookups. Ideal for quick loan estimation, savings projections, or any scenario where the agent supplies all three inputs directly.

## Known failure modes

- Missing required fields (principal, annual_rate_percent, years) may return a validation error
- Values exceeding schema maximums (e.g. principal > 1 trillion, rate > 1000%) will be rejected
- Floating-point precision edge cases may yield minor rounding differences
- Payment failure (x402) will block access if USDC balance is insufficient

## How this service works

Evidence-backed autonomous AI jobs and paid data tools. Queue/D1/cron run outside the chat; free quotas and bounded execution apply.

## Output

Returns a JSON object with 'interest' (the raw interest accrued), 'total' (principal plus interest), and a 'notice' disclaimer clarifying the result is a mathematical calculation from supplied inputs only, not financial advice.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "years": {
   "type": "number",
   "maximum": 1000,
   "minimum": 0,
   "description": "Years."
  },
  "principal": {
   "type": "number",
   "maximum": 1000000000000,
   "minimum": 0,
   "description": "Amount in one consistent currency; floating-point calculation, not an accounting ledger."
  },
  "annual_rate_percent": {
   "type": "number",
   "maximum": 1000,
   "minimum": 0,
   "description": "Supplied percentage rate, not a fetched or recommended rate."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "total": 1100,
  "notice": "Calculation from supplied inputs only; no tax, investment or lending advice.",
  "interest": 100
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signaldesk-ai-simple-interest-calculator-fb42beec/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-agent.kariguetoazul.workers.dev](https://www.zero.xyz/host/x402-agent.kariguetoazul.workers.dev/llms.txt)