Clamp Fluid

{
  "asOf": "2026-10-11T14:32:43.131Z",
  "css": "clamp(1rem, 0.8182rem + 0.9091vw, 1.5rem)",
  "cssInPx": "clamp(16px, 13.0909px + 0.9091vw, 24px)",
  "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.",
  "evaluatedAtViewport": null,
  "interceptPx": 13.09090909,
  "interceptRem": 0.81818182,
  "maxRem": 1.5,
  "minRem": 1,
  "notChecked": [
    "user zoom and text-only zoom: using rem plus vw keeps text resizable, but a viewport-only value would not (WCAG 1.4.4 needs zoom to still scale text)",
    "container width: the slope is in vw, so it follows the viewport, not the component",
    "…1 more"
  ],
  "reasons": [
    "Slope 0.909091vw; intercept 13.090909px (0.818182rem).",
    "Below the minimum viewport the size stays at the minimum, above the maximum viewport it stays at the maximum."
  ],
  "rootPx": 16,
  "sizeAtMidpointPx": 20,
  "sizeAtViewportPx": null,
  "slopeVw": 0.90909091,
  "source": "Linear interpolation; the clamp() form follows CSS Values and Units Level 4, computed locally",
  "summary": "clamp(1rem, 0.8182rem + 0.9091vw, 1.5rem): 16px at 320px wide to 24px at 1200px.",
  "verdict": "COMPUTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://css-design-calc.x402tookit.com/clamp-fluid?maxSize=24&maxViewport=1200&minSize=16&minViewport=320&rootPx=16'

# 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/clamp-fluid?maxSize=24&maxViewport=1200&minSize=16&minViewport=320&rootPx=16' \
  | 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%2Fclamp-fluid
const res = await pay("https://css-design-calc.x402tookit.com/clamp-fluid?maxSize=24&maxViewport=1200&minSize=16&minViewport=320&rootPx=16");
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/clamp-fluid?maxSize=24&maxViewport=1200&minSize=16&minViewport=320&rootPx=16")
    print(res.status_code, res.text)