Incline

{
  "accelerationMS2": 2.355483,
  "angleDeg": 30,
  "asOf": "2026-10-11T08:56:12.228Z",
  "criticalAngleDeg": 26.5651,
  "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.",
  "endSpeedMS": 4.853331,
  "forceDownSlopeN": 49.03325,
  "kineticFrictionN": 25.47842,
  "massKg": 10,
  "maxStaticFrictionN": 42.46404,
  "normalForceN": 84.92808,
  "notChecked": [
    "rolling objects (wheels and balls roll and have rotational inertia)",
    "air drag and a changing friction coefficient with speed",
    "…1 more"
  ],
  "reasons": [
    "Down-slope force = m g sin(a); normal force = m g cos(a); slips when tan(a) exceeds the static coefficient; a = g (sin(a) - muK cos(a))."
  ],
  "slideTimeS": 2.06044,
  "slides": true,
  "source": "computed locally",
  "summary": "The block slides at 2.355 m/s2 (down-slope force 49.03 N beats the static limit 42.46 N). Down 5 m it takes 2.06 s and reaches 4.853 m/s.",
  "verdict": "SLIDES",
  "weightN": 98.0665
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://physics-calc.x402tookit.com/incline?angleDeg=30&lengthM=5&massKg=10&muKinetic=0.3&muStatic=0.5'

# 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/incline?angleDeg=30&lengthM=5&massKg=10&muKinetic=0.3&muStatic=0.5' \
  | 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%2Fincline
const res = await pay("https://physics-calc.x402tookit.com/incline?angleDeg=30&lengthM=5&massKg=10&muKinetic=0.3&muStatic=0.5");
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/incline?angleDeg=30&lengthM=5&massKg=10&muKinetic=0.3&muStatic=0.5")
    print(res.status_code, res.text)