Work Energy

{
  "asOf": "2026-10-11T08:56:14.581Z",
  "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.",
  "notChecked": [
    "relativistic speeds (kinetic energy 1/2 m v^2 fails near the speed of light; see /relativity)",
    "friction and other losses unless you include them in the force",
    "…1 more"
  ],
  "power": {
    "horsepower": 0.0670511,
    "kilowatts": 0.05,
    "watts": 50
  },
  "reasons": [
    "W = F d cos(angle); KE = m v^2 / 2; PE = m g h; P = W / t. 1 hp (mechanical) = 745.7 W; 1 kcal = 4184 J."
  ],
  "source": "computed locally",
  "summary": "work 250 J; power 50 W.",
  "verdict": "COMPUTED",
  "work": {
    "footPounds": 184.391,
    "joules": 250,
    "kilocalories": 0.0597514,
    "kilowattHours": 0.0000694444
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://physics-calc.x402tookit.com/work-energy?angleDeg=60&distanceM=10&forceN=50&timeS=5'

# 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://physics-calc.x402tookit.com/work-energy?angleDeg=60&distanceM=10&forceN=50&timeS=5' \
  | 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%2Fphysics-calc.x402tookit.com%2Fwork-energy
const res = await pay("https://physics-calc.x402tookit.com/work-energy?angleDeg=60&distanceM=10&forceN=50&timeS=5");
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://physics-calc.x402tookit.com/work-energy?angleDeg=60&distanceM=10&forceN=50&timeS=5")
    print(res.status_code, res.text)