Fuel Time Distance

{
  "asOf": "2026-10-11T14:44:08.060Z",
  "degraded": false,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "distanceNm": 150,
  "enduranceHhMm": "3:45",
  "enduranceHours": 3.75,
  "enduranceToReserveHhMm": "3:00",
  "fuelFlowPerHour": 8,
  "fuelOnBoard": 30,
  "fuelRemainingAtLanding": 20,
  "groundspeedKt": 120,
  "maxRangeNmNoReserve": 450,
  "notChecked": [
    "fuel for taxi, climb, approach and a missed approach: enter a realistic average flow",
    "winds aloft changes along the route, which change groundspeed",
    "…2 more"
  ],
  "rangeNmToReserve": 360,
  "reasons": [
    "Time = distance / groundspeed; fuel = flow x time; range = (fuel on board - reserve) / flow x groundspeed.",
    "Groundspeed is true airspeed corrected for wind (see /wind-triangle)."
  ],
  "remainingMinutesAtLanding": 150,
  "reserveFuel": 6,
  "reserveMin": 45,
  "source": "computed locally",
  "summary": "150 nm at 120 kt takes 1:15 (75 min). Trip fuel 10 at 8 per hour. On landing 20 remains (150 min) against a 45 min reserve of 6: enough fuel with reserve. Range to reserve 360 nm.",
  "timeHhMm": "1:15",
  "timeMin": 75,
  "tripFuel": 10,
  "verdict": "ENOUGH_FUEL_WITH_RESERVE"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://aviation-calc.x402tookit.com/fuel-time-distance?distanceNm=150&fuelFlowPerHour=8&fuelOnBoard=30&groundspeedKt=120&reserveMin=45'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://aviation-calc.x402tookit.com/fuel-time-distance?distanceNm=150&fuelFlowPerHour=8&fuelOnBoard=30&groundspeedKt=120&reserveMin=45' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Faviation-calc.x402tookit.com%2Ffuel-time-distance
const res = await pay("https://aviation-calc.x402tookit.com/fuel-time-distance?distanceNm=150&fuelFlowPerHour=8&fuelOnBoard=30&groundspeedKt=120&reserveMin=45");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://aviation-calc.x402tookit.com/fuel-time-distance?distanceNm=150&fuelFlowPerHour=8&fuelOnBoard=30&groundspeedKt=120&reserveMin=45")
    print(res.status_code, res.text)