# Sindri Fat FIRE Calculator

> Sindri Fat FIRE Calculator is a paid API for AI agents from x402.outpimp.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Runs a year-by-year compound-growth simulation to compute how long until you can retire on a higher, lifestyle-preserving spending target using Fat FIRE principles.

## Facts

- Endpoint: POST https://x402.outpimp.com/fatFireCalculator
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sindri-fat-fire-calculator-f7b1a7b8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SSU3MprjIrZKzDehEWaq5

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 sindri-fat-fire-calculator-f7b1a7b8 -d '<json body>'
```

Example prompt: I'm 35 years old with $800K invested, take home $180K a year, spend $90K now, and want to retire spending $200K a year. Assuming a 7% return, 3% inflation, and a 4% safe withdrawal rate, how many years until I can Fat FIRE?

## When to prefer this

Choose this endpoint when a user wants to model retirement with a higher-than-lean spending target — Fat FIRE scenarios where preserving lifestyle is the goal. Prefer it over a standard FIRE calculator when retirement spending significantly exceeds current spending. It is ideal for high-income earners or dual-income households targeting $100K+ annual retirement budgets. The year-by-year simulation makes it more useful than simple rule-of-thumb FIRE number calculators.

## Known failure modes

- Missing required fields (currentAge, currentNetWorth, currentAnnualIncome, currentAnnualSpending, retirementAnnualSpending) return validation errors
- Unrealistic inputs (e.g. negative net worth, SWR of 0) may produce infinite or nonsensical projections
- retirementAnnualSpending lower than currentAnnualSpending may compute but undermines Fat FIRE framing
- Very high spending targets relative to savings rate may result in 'never reaches FIRE' outcome
- Payment failure (insufficient USDC balance) results in 402 response with no computation

## How this service works

Fat FIRE calculator. Same year-by-year compound-growth simulation as the standard FIRE calculator, framed for a higher, more lifestyle-preserving retirement spending target.

## Output

Returns a year-by-year compound growth simulation showing portfolio value over time, the projected number of years until the Fat FIRE target is reached, and the retirement portfolio size required to sustainably fund the higher annual spending target based on the specified safe withdrawal rate.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "swr": {
   "type": "number",
   "default": 0.04,
   "description": "Safe withdrawal rate, as a fraction. Default 0.04."
  },
  "currentAge": {
   "type": "number",
   "description": "Your current age in years."
  },
  "inflationRate": {
   "type": "number",
   "default": 0.03,
   "description": "Expected annual inflation rate, as a fraction. Default 0.03."
  },
  "currentNetWorth": {
   "type": "number",
   "description": "Current invested net worth."
  },
  "currentAnnualIncome": {
   "type": "number",
   "description": "Current annual take-home income."
  },
  "investmentReturnRate": {
   "type": "number",
   "default": 0.07,
   "description": "Expected annual investment return, as a fraction. Default 0.07."
  },
  "currentAnnualSpending": {
   "type": "number",
   "description": "Current annual spending."
  },
  "retirementAnnualSpending": {
   "type": "number",
   "description": "Target (higher) annual spending in retirement."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sindri-fat-fire-calculator-f7b1a7b8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.outpimp.com](https://www.zero.xyz/host/x402.outpimp.com/llms.txt)