# Vextorium Savings Plan Calculator

> Vextorium Savings Plan Calculator is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-15).

Calculates the full trajectory of a savings or investment plan with monthly contributions, compound interest, inflation adjustment, yearly evolution, and goal-based monthly contribution target.

## Facts

- Endpoint: POST https://api.vextorium.com/v1/savings-plan?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-savings-plan-calculator-fe24b9b1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PbMwOVo8-rIRj2xB1a9_X

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 vextorium-savings-plan-calculator-fe24b9b1 -d '<json body>'
```

Example prompt: I'm starting a savings plan with $5,000 already saved and want to contribute $400 a month for 15 years at an estimated 6% annual return — can you calculate the final value, how much interest I'll earn, what it'll be worth in today's money assuming 2.5% inflation, and how much I'd need to contribute monthly to hit $150,000 instead?

## When to prefer this

Choose this endpoint when you need a full financial projection of a recurring savings or investment plan, including compound interest, inflation-adjusted real value, year-by-year growth, and goal-based contribution planning — all in a single call. Prefer it over generic calculator tools when you need the complete picture: total contributed vs. interest earned, real vs. nominal value, and backward-looking goal calculation (required monthly amount to reach a target).

## Known failure modes

- Missing required fields (monthly_contribution, years, annual_return_pct) returns validation error
- Negative or zero values for years or return percentage may produce nonsensical results
- Extremely high inflation_pct values relative to return may yield near-zero real values
- No target provided means for_target block will be absent or null
- Network timeout if upstream calculation service is unavailable

## How this service works

Savings or investment plan with monthly contributions and compound interest: final value, total contributed, interest earned, value in today's money after inflation, yearly evolution and the monthly amount needed to reach a goal.

## Output

Returns a JSON object with: final_value (total portfolio value at end of period), total_contributed (sum of all monthly contributions), interest (total interest/returns earned), final_value_in_todays_money (inflation-adjusted final value), evolution (array of year-by-year snapshots showing year, value, and total contributed to date), for_target (object with the target amount and the required_monthly_contribution to reach it), and a note about assumptions.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "years": {
   "type": "number"
  },
  "target": {
   "type": "number"
  },
  "inflation_pct": {
   "type": "number"
  },
  "initial_capital": {
   "type": "number"
  },
  "annual_return_pct": {
   "type": "number"
  },
  "monthly_contribution": {
   "type": "number"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "note": "Constant return assumed; real markets vary. No taxes or fees.",
  "interest": 44894.86,
  "evolution": [
   {
    "year": 1,
    "value": 3525.31,
    "contributed": 3400
   },
   {
    "year": 2,
    "value": 6202.13,
    "contributed": 5800
   }
  ],
  "for_target": {
   "target": 100000,
   "required_monthly_contribution": 213.46
  },
  "final_value": 93894.86,
  "total_contributed": 49000,
  "final_value_in_todays_money": 63188.55
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-savings-plan-calculator-fe24b9b1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)