Color Adjust

{
  "asOf": "2026-10-11T04:02:39.957Z",
  "changes": {
    "hue": 20,
    "lightness": 15,
    "saturation": -10
  },
  "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.",
  "from": {
    "h": 220,
    "l": 50,
    "s": 60
  },
  "notChecked": [
    "perceptual uniformity (HSL lightness is not perceived lightness)"
  ],
  "original": "#3366cc",
  "reasons": [
    "Values are clamped to the valid HSL range."
  ],
  "result": "#7979d2",
  "source": "computed locally",
  "summary": "#3366cc with lightness +15, saturation -10, hue +20 = #7979d2.",
  "verdict": "ADJUSTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://color-design.x402tookit.com/color-adjust?color=3366cc&hue=20&lightness=15&saturation=-10'

# 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://color-design.x402tookit.com/color-adjust?color=3366cc&hue=20&lightness=15&saturation=-10' \
  | 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%2Fcolor-design.x402tookit.com%2Fcolor-adjust
const res = await pay("https://color-design.x402tookit.com/color-adjust?color=3366cc&hue=20&lightness=15&saturation=-10");
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://color-design.x402tookit.com/color-adjust?color=3366cc&hue=20&lightness=15&saturation=-10")
    print(res.status_code, res.text)