Fuel Trip Cost

{
  "alternativeCost": 26.25,
  "alternativeFuel": 7.5,
  "alternativeSavingsOrExtra": 7.16,
  "asOf": "2026-10-11T14:38:37.389Z",
  "averageEconomy": 31.43,
  "cost": 33.41,
  "costPerDistance": 0.1114,
  "costPerPerson": 16.7,
  "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.",
  "distance": 300,
  "distanceUnit": "miles",
  "fuel": 9.545,
  "fuelUnit": "gallons",
  "legs": [
    {
      "cost": 5.83,
      "distance": 40,
      "fuel": 1.667,
      "leg": "city"
    },
    {
      "cost": 27.58,
      "distance": 260,
      "fuel": 7.879,
      "leg": "highway"
    }
  ],
  "notChecked": [
    "real consumption: speed, load, wind, hills, cold weather, air conditioning and driving style change economy by 10 to 30%",
    "price changes along the route and the detour to a station",
    "…2 more"
  ],
  "rangePerTank": 396,
  "reasons": [
    "Fuel = miles / mpg per leg; cost = fuel x price.",
    "Refuel stops = ceil(total fuel / usable tank) - 1, with the reserve share left in the tank."
  ],
  "refuelStops": 0,
  "roundTrip": false,
  "source": "computed locally",
  "summary": "300 miles uses 9.55 gallons and costs 33.41 (0.111 per mile, 16.7 each for 2). A 14-gallon tank with 10% reserve goes about 396 miles; 0 refuel stops needed. The comparison vehicle (40 mpg) would cost…",
  "tankReservePercent": 10,
  "usableTank": 12.6,
  "verdict": "COMPUTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://automotive-calc.x402tookit.com/fuel-trip-cost?altEconomy=40&legs=city%3A40%3A24%3B+highway%3A260%3A33&people=2&pricePerUnit=3.5&tankSize=14'

# 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://automotive-calc.x402tookit.com/fuel-trip-cost?altEconomy=40&legs=city%3A40%3A24%3B+highway%3A260%3A33&people=2&pricePerUnit=3.5&tankSize=14' \
  | 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%2Fautomotive-calc.x402tookit.com%2Ffuel-trip-cost
const res = await pay("https://automotive-calc.x402tookit.com/fuel-trip-cost?altEconomy=40&legs=city%3A40%3A24%3B+highway%3A260%3A33&people=2&pricePerUnit=3.5&tankSize=14");
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://automotive-calc.x402tookit.com/fuel-trip-cost?altEconomy=40&legs=city%3A40%3A24%3B+highway%3A260%3A33&people=2&pricePerUnit=3.5&tankSize=14")
    print(res.status_code, res.text)