ToolVet
75trust / 100

Electric Car Savings Calculator

by Sindri in Other

x402 APIPassing, checked 50 min ago

Electric car savings calculator. Compares annual electricity cost against annual gas cost for a comparable gas vehicle, accounting for free-charging usage, and computes break-even years, cost per full charge, and gas-price-equivalent effective MPG.

POST https://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/electricCarSavingsCalculator

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
392 ms typical, 546 ms slowest 5%
Last check
50 min ago
Next check
any minute now

How to call it

POST https://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/electricCarSavingsCalculator

Each call costs $0.01 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/electricCarSavingsCalculator
content-type: application/json

{
  "electricVehicle": {
    "batteryCapacityKwh": 60,
    "electricityRatePerKwh": 0.13,
    "freeChargingPercent": 0,
    "purchasePrice": 35000,
    "rangeMiles": 240
  },
  "gasPricePerGallon": 3.5,
  "gasVehicle": {
    "mpg": 30,
    "purchasePrice": 25000
  },
  "milesPerYear": 12000
}

Parameters

ParameterTypeRequiredDescription
electricVehicleobjectYes
gasPricePerGallonnumberYesLocal gas price per gallon.
gasVehicleobjectYes
milesPerYearnumberYesExpected annual miles driven.

Example response

The provider's example. We can't check it without paying.

Example response, 26 lines
{
  "data": {
    "annualElectricityCost": 390,
    "annualGasCost": 1400,
    "annualSavings": 1010,
    "breakEvenYears": 9.900990099009901,
    "costPerCharge": 7.800000000000001,
    "effectiveMPG": 107.6923076923077,
    "params": {
      "electricVehicle": {
        "batteryCapacityKwh": 60,
        "electricityRatePerKwh": 0.13,
        "freeChargingPercent": 0,
        "purchasePrice": 35000,
        "rangeMiles": 240
      },
      "gasPricePerGallon": 3.5,
      "gasVehicle": {
        "mpg": 30,
        "purchasePrice": 25000
      },
      "milesPerYear": 12000
    }
  },
  "ok": true
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.01.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/electricCarSavingsCalculator' \
  -H 'content-type: application/json' \
  --data-raw '{"electricVehicle":{"batteryCapacityKwh":60,"electricityRatePerKwh":0.13,"freeChargingPercent":0,"purchasePrice":35000,"rangeMiles":240},"gasPricePerGallon":3.5,"gasVehicle":{"mpg":30,"purchasePrice":25000},"milesPerYear":12000}'

# 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 - -X POST 'https://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/electricCarSavingsCalculator' \
  -H 'content-type: application/json' \
  --data-raw '{"electricVehicle":{"batteryCapacityKwh":60,"electricityRatePerKwh":0.13,"freeChargingPercent":0,"purchasePrice":35000,"rangeMiles":240},"gasPricePerGallon":3.5,"gasVehicle":{"mpg":30,"purchasePrice":25000},"milesPerYear":12000}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws%2FelectricCarSavingsCalculator&method=POST
const res = await pay("https://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/electricCarSavingsCalculator", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "electricVehicle": {
      "batteryCapacityKwh": 60,
      "electricityRatePerKwh": 0.13,
      "freeChargingPercent": 0,
      "purchasePrice": 35000,
      "rangeMiles": 240
    },
    "gasPricePerGallon": 3.5,
    "gasVehicle": {
      "mpg": 30,
      "purchasePrice": 25000
    },
    "milesPerYear": 12000
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# 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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/electricCarSavingsCalculator",
        json={
            "electricVehicle": {
                "batteryCapacityKwh": 60,
                "electricityRatePerKwh": 0.13,
                "freeChargingPercent": 0,
                "purchasePrice": 35000,
                "rangeMiles": 240,
            },
            "gasPricePerGallon": 3.5,
            "gasVehicle": {
                "mpg": 30,
                "purchasePrice": 25000,
            },
            "milesPerYear": 12000,
        },
    )
    print(res.status_code, res.text)

Security scan

  • No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

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