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Sindri Fat FIRE Calculator
x402
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.
Price / call$0.01
Success—
StatusUnknown
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.
Example use cases
Tech worker planning early retirement
“I'm 32, have $500K invested, earn $220K take-home, currently spend $80K a year, but want to retire living on $180K a year. With a 7% return rate and 3% inflation and a 4% SWR, how many years away is my Fat FIRE date?”
Couple stress-testing high retirement spend
“We're 45 with $1.2M saved, bring home $300K combined, spend $120K now, and dream of retiring on $250K a year. Can you run a Fat FIRE simulation with 6% returns, 3% inflation, and a 3.5% safe withdrawal rate to see when we could pull the trigger?”
Mid-career professional comparing spending targets
“I'm 40, have $600K invested, earn $150K take-home, and spend $70K annually. I want to see when I could Fat FIRE if I target $160K per year in retirement — assume 7% returns, 3% inflation, and a 4% SWR.”
Technical details
Endpoint
POSThttps://x402.outpimp.com/fatFireCalculatorWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| swr | number | Safe withdrawal rate, as a fraction. Default 0.04. |
| currentAge | number | Your current age in years. |
| inflationRate | number | Expected annual inflation rate, as a fraction. Default 0.03. |
| currentNetWorth | number | Current invested net worth. |
| currentAnnualIncome | number | Current annual take-home income. |
| investmentReturnRate | number | Expected annual investment return, as a fraction. Default 0.07. |
| currentAnnualSpending | number | Current annual spending. |
| retirementAnnualSpending | number | Target (higher) annual spending in retirement. |
Tags
x402
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