Coast FIRE calculator
Coast FIRE calculator. Computes the lump sum needed today, invested with zero further contributions, to grow into your full retirement number by your target retirement age, plus (given an ongoing monthly contribution) a year-by-year projection of when your actual trajectory crosses that lump sum.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
233 msmedian answer time
$0.01listed price per call
$0.01price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://x402.outpimp.com/coastFireCalculator
| Category | Everything else |
|---|---|
| Provider host | x402.outpimp.com |
| Networks | eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 3 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.01 | 233 ms |
Example input (from the provider)
{
"body": {
"currentAge": 30,
"currentNetWorth": 100000,
"retirementAge": 65,
"retirementAnnualSpending": 40000
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"currentAge": {
"description": "Your current age in years.",
"type": "number"
},
"currentNetWorth": {
"description": "Current invested net worth.",
"type": "number"
},
"inflationRate": {
"default": 0.03,
"description": "Expected annual inflation rate, as a fraction. Default 0.03.",
"type": "number"
},
"investmentReturnRate": {
"default": 0.07,
"description": "Expected annual investment return, as a fraction. Default 0.07.",
"type": "number"
},
"monthlyContribution": {
"default": 0,
"description": "Ongoing monthly contribution toward currentNetWorth. Default 0.",
"type": "number"
},
"retirementAge": {
"default": 67,
"description": "Target traditional retirement age. Default 67.",
"type": "number"
},
"retirementAnnualSpending": {
"description": "Expected annual spending in retirement.",
"type": "number"
},
"swr": {
"default": 0.04,
"description": "Safe withdrawal rate, as a fraction. Default 0.04.",
"type": "number"
}
},
"required": [
"currentAge",
"currentNetWorth",
"retirementAnnualSpending"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}