Css Unit Convert

{
  "allUnits": {
    "%": 112.5,
    "cm": 0.47625,
    "em": 1.125,
    "in": 0.1875,
    "mm": 4.7625,
    "pc": 1.125,
    "pt": 13.5,
    "px": 18,
    "q": 19.05,
    "rem": 1.125,
    "vh": 2,
    "vmax": 1.25,
    "vmin": 2,
    "vw": 1.25
  },
  "asOf": "2026-10-11T14:32:43.659Z",
  "css": "1.125rem",
  "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.",
  "input": {
    "unit": "px",
    "value": 18
  },
  "notChecked": [
    "font-relative units that depend on the actual font: ch, ex, cap, lh, rlh, ic",
    "container query units (cqw, cqh) and dynamic viewport units (dvh, svh, lvh), which depend on browser chrome",
    "…2 more"
  ],
  "parentPx": 16,
  "pixels": 18,
  "reasons": [
    "Absolute units use the CSS reference pixel: 1in = 96px, 1pt = 1/72in, 1pc = 12pt, 1cm = 96/2.54px.",
    "rem used a root of 16px; em and % used a parent of 16px; vw/vh used a 1440 x 900 viewport."
  ],
  "result": 1.125,
  "resultUnit": "rem",
  "rootPx": 16,
  "source": "CSS Values and Units Level 4 absolute-unit definitions (1in = 96px = 72pt = 6pc = 2.54cm), computed locally",
  "summary": "18px = 1.125rem (18px).",
  "verdict": "CONVERTED",
  "viewportH": 900,
  "viewportW": 1440
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://css-design-calc.x402tookit.com/css-unit-convert?from=px&rootPx=16&to=rem&value=18'

# 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://css-design-calc.x402tookit.com/css-unit-convert?from=px&rootPx=16&to=rem&value=18' \
  | 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%2Fcss-design-calc.x402tookit.com%2Fcss-unit-convert
const res = await pay("https://css-design-calc.x402tookit.com/css-unit-convert?from=px&rootPx=16&to=rem&value=18");
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://css-design-calc.x402tookit.com/css-unit-convert?from=px&rootPx=16&to=rem&value=18")
    print(res.status_code, res.text)