Bill Estimate

{
  "asOf": "2026-10-11T14:31:35.125Z",
  "averagePricePerKwh": 0.15525,
  "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.",
  "energyCharge": 105,
  "fixedCharge": 10,
  "kwh": 800,
  "notChecked": [
    "time-of-use, demand and seasonal rates, riders, fuel-cost adjustments and credits (enter their effect in the tiers if you know it)",
    "your utility's actual billing rules, rounding and proration",
    "…2 more"
  ],
  "reasons": [
    "Energy charge = kWh in each block x that block's rate, then fixed charge, then tax on the sum.",
    "Average price 0.1553 per kWh including fixed charge and tax; marginal (next kWh) price 0.162."
  ],
  "source": "computed locally",
  "subtotal": 115,
  "summary": "800 kWh costs 124.2: energy 105 + fixed 10 + 8% tax 9.2.",
  "taxes": 9.2,
  "tierBreakdown": [
    {
      "cost": 60,
      "kwh": 500,
      "rate": 0.12
    },
    {
      "cost": 45,
      "kwh": 300,
      "rate": 0.15
    }
  ],
  "total": 124.2,
  "unbilledKwh": 0,
  "verdict": "COMPUTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://home-energy-calc.x402tookit.com/bill-estimate?fixedCharge=10&kwh=800&taxPercent=8&tiers=500%400.12%3B+rest%400.15'

# 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://home-energy-calc.x402tookit.com/bill-estimate?fixedCharge=10&kwh=800&taxPercent=8&tiers=500%400.12%3B+rest%400.15' \
  | 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%2Fhome-energy-calc.x402tookit.com%2Fbill-estimate
const res = await pay("https://home-energy-calc.x402tookit.com/bill-estimate?fixedCharge=10&kwh=800&taxPercent=8&tiers=500%400.12%3B+rest%400.15");
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://home-energy-calc.x402tookit.com/bill-estimate?fixedCharge=10&kwh=800&taxPercent=8&tiers=500%400.12%3B+rest%400.15")
    print(res.status_code, res.text)