Iso Week

{
  "asOf": "2026-10-11T23:39:14.006Z",
  "calendarYear": 2021,
  "dayOfYear": 3,
  "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.",
  "isoWeekDate": "2020-W53-7",
  "notChecked": [
    "US, Middle East or other week-numbering systems (weeks starting Sunday or Saturday)",
    "company fiscal calendars and 4-4-5 retail calendars",
    "…1 more"
  ],
  "reasons": [
    "Week 1 is the week containing the first Thursday of the year; weeks run Monday to Sunday.",
    "The date belongs to week-year 2020, not calendar year 2021, because its Thursday falls in 2020.",
    "…1 more"
  ],
  "source": "ISO 8601 week-date rules (weeks start Monday, week 1 holds the first Thursday), computed locally",
  "sprint": {
    "beforeSprintOne": false,
    "dayOfSprint": 7,
    "end": "2021-01-10",
    "lengthDays": 14,
    "number": 2,
    "start": "2020-12-28"
  },
  "summary": "2021-01-03 is 2020-W53-7 (Sunday).",
  "verdict": "COMPUTED",
  "week": 53,
  "weekMonday": "2020-12-28",
  "weekSunday": "2021-01-03",
  "weekYear": 2020,
  "weekYearDiffersFromYear": true,
  "weekday": 7,
  "weekdayName": "Sunday",
  "weeksInWeekYear": 53
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://work-time-calc.x402tookit.com/iso-week?date=2021-01-03&sprintStart=2020-12-14&sprintWeeks=2'

# 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://work-time-calc.x402tookit.com/iso-week?date=2021-01-03&sprintStart=2020-12-14&sprintWeeks=2' \
  | 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%2Fwork-time-calc.x402tookit.com%2Fiso-week
const res = await pay("https://work-time-calc.x402tookit.com/iso-week?date=2021-01-03&sprintStart=2020-12-14&sprintWeeks=2");
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://work-time-calc.x402tookit.com/iso-week?date=2021-01-03&sprintStart=2020-12-14&sprintWeeks=2")
    print(res.status_code, res.text)