Type Scale

{
  "asOf": "2026-10-11T14:32:45.228Z",
  "base": 16,
  "customProperties": "--step-5: 3.0518rem; --step-4: 2.4414rem; --step-3: 1.9531rem; --step-2: 1.5625rem; --step-1: 1.25rem; --step-0: 1rem; --step-n1: 0.8rem; --step-n2: 0.64rem;",
  "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": [
    "rounding to whole pixels (sizes are exact; browsers may round text rendering)",
    "whether a step is legible on screens or readable at your line length",
    "…1 more"
  ],
  "ratio": 1.25,
  "ratioName": "major-third",
  "reasons": [
    "Each step multiplies by 1.25; step 0 is the base 16px.",
    "Steps are exact; round for production if needed."
  ],
  "rootPx": 16,
  "source": "Modular scale: size(n) = base x ratio^n (Tim Brown); ratios are the musical-interval values used by common scale tools, computed locally",
  "steps": [
    {
      "css": "3.0518rem",
      "px": 48.8281,
      "rem": 3.05176,
      "step": 5
    },
    {
      "css": "2.4414rem",
      "px": 39.0625,
      "rem": 2.44141,
      "step": 4
    }
  ],
  "stepsAbove": 5,
  "stepsBelow": 2,
  "summary": "8 steps from 10.24px to 48.8281px at ratio 1.25 (major-third) from a 16px base.",
  "verdict": "COMPUTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://css-design-calc.x402tookit.com/type-scale?base=16&down=2&ratio=major-third&up=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://css-design-calc.x402tookit.com/type-scale?base=16&down=2&ratio=major-third&up=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%2Fcss-design-calc.x402tookit.com%2Ftype-scale
const res = await pay("https://css-design-calc.x402tookit.com/type-scale?base=16&down=2&ratio=major-third&up=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://css-design-calc.x402tookit.com/type-scale?base=16&down=2&ratio=major-third&up=5")
    print(res.status_code, res.text)