# AgentGate Compound Interest Future Value Calculator

> AgentGate Compound Interest Future Value Calculator is a paid API for AI agents from agentgate-production-eb21.up.railway.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Calculates the compound interest future value of a principal amount given an annual interest rate and number of years.

## Facts

- Endpoint: GET https://agentgate-production-eb21.up.railway.app/quote
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentgate-compound-interest-future-value-calculator-297d0e1d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZzUgOLmTitXGr5iotroS7

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 agentgate-compound-interest-future-value-calculator-297d0e1d
```

Example prompt: What will $5,000 grow to after 20 years with a 7% annual compound interest rate?

## When to prefer this

Use this endpoint when you need a quick, single compound interest future-value calculation with standard annual compounding given a principal, decimal annual rate, and integer number of years. Ideal for financial planning queries, investment projections, and savings growth estimates where no complex compounding frequency or tax modeling is needed.

## Known failure modes

- Missing or invalid rate, principal, or years parameters may result in default values being used rather than an error
- Non-numeric query parameter values may cause a 400 or unexpected result
- Negative principal or rate values may produce mathematically valid but nonsensical results
- Very large year values may produce unrealistically large numbers without warning
- Payment not included or insufficient USDC balance results in a 402 Payment Required response

## How this service works

Compound interest future-value quote. Returns future_value for a principal, annual rate, and number of years.

## Output

Returns a future_value figure representing the grown dollar amount of the principal after compounding at the given annual rate for the specified number of years.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "rate": {
       "type": "number",
       "description": "Annual interest rate as a decimal, e.g. 0.05 (default 0.05)"
      },
      "years": {
       "type": "number",
       "description": "Years compounded (default 10)"
      },
      "principal": {
       "type": "number",
       "description": "Starting amount in dollars (default 1000)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentgate-compound-interest-future-value-calculator-297d0e1d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentgate-production-eb21.up.railway.app](https://www.zero.xyz/host/agentgate-production-eb21.up.railway.app/llms.txt)