# Compound Growth Future Value Calculator

> Compound Growth Future Value Calculator is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-01).

Calculates the future value of an investment with compounding interest and optional regular periodic contributions

## Facts

- Endpoint: POST https://twin.unykorn.org/compound-growth?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/compound-growth-future-value-calculator-696589c0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qfC6GYFWo0SxuCbVOEfyG

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 compound-growth-future-value-calculator-696589c0 -d '<json body>'
```

Example prompt: What will $5,000 grow to if I invest it at a 7% annual rate for 10 years, compounded monthly, and add $200 every month?

## When to prefer this

Choose this endpoint when you need a pay-per-call, auditable compound interest calculation with blockchain receipt proof — ideal for agent workflows requiring verifiable financial computations without maintaining your own math infrastructure. Prefer over building custom logic when you need both the calculation and an immutable on-chain receipt in a single call. Best suited for scenarios where the $0.002 per-call cost is acceptable and auditability matters.

## Known failure modes

- Invalid or non-numeric values for rate, principal, or contribution strings causing computation failure
- Negative or zero periods causing a minimum constraint violation (periods minimum: 0)
- Payment failure via x402 protocol resulting in 402 response before computation runs
- Missing required parameters such as rate or years returning an error response
- Malformed request body not conforming to the nested params object structure

## How this service works

Future value with compounding and optional regular contributions — Genesis402 / UnyKorn Operator Network

## Output

Returns a JSON object confirming the computation type as 'compound-growth', the calculated future value result, a blockchain receipt with transaction hash, USD amount paid, and a unique receipt ID, along with an ISO 8601 timestamp of when the result was generated.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "params": {
   "type": "object",
   "properties": {
    "rate": {
     "type": "string"
    },
    "years": {
     "type": "string"
    },
    "periods": {
     "type": "integer",
     "minimum": 0
    },
    "principal": {
     "type": "string"
    },
    "contribution": {
     "type": "string"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "type": "compound-growth",
  "receipt": {
   "tx_hash": "0x<64hex>",
   "amount_usd": 0.002,
   "receipt_id": "g402-<16hex>"
  },
  "generated_at": "<iso8601>"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/compound-growth-future-value-calculator-696589c0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from twin.unykorn.org](https://www.zero.xyz/host/twin.unykorn.org/llms.txt)