Typographic Units

{
  "asOf": "2026-10-12T01:48:15.465Z",
  "conversions": {
    "cicero": 0.93807764,
    "cm": 0.42333333,
    "didot": 11.256919,
    "in": 0.16666667,
    "mm": 4.2333333,
    "pica": 1,
    "pt": 12,
    "px": 16,
    "q": 16.933333,
    "tex-pt": 12.045,
    "twip": 240
  },
  "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.",
  "fromUnit": "pt",
  "input": 12,
  "millimeters": 4.233333,
  "notChecked": [
    "the printer's own point definitions in old systems (the 72.27 TeX point and Didot differ slightly)",
    "font-size-to-line-height choices",
    "…1 more"
  ],
  "picasAndPoints": "1p0",
  "reasons": [
    "1 pica = 12 points = 1/6 inch; 1 inch = 72 PostScript points = 25.4 mm; CSS fixes 96 px to an inch."
  ],
  "source": "computed locally (PostScript point = 1/72 in; pica = 12 pt; CSS px = 1/96 in)",
  "summary": "12 pt = 4.2333 mm = 12 pt = 1p0.",
  "verdict": "CONVERTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://paper-print-calc.x402tookit.com/typographic-units?from=pt&value=12'

# 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://paper-print-calc.x402tookit.com/typographic-units?from=pt&value=12' \
  | 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%2Fpaper-print-calc.x402tookit.com%2Ftypographic-units
const res = await pay("https://paper-print-calc.x402tookit.com/typographic-units?from=pt&value=12");
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://paper-print-calc.x402tookit.com/typographic-units?from=pt&value=12")
    print(res.status_code, res.text)