Twenty Four Daily

{
  "attribution": null,
  "challenge_id": "sha256:91ea634735ae4ff57c83ef8f3f08fdecf0b146d41582264bdcbb64b560f36cce",
  "date": "2026-07-01",
  "difficulty": "normal",
  "game": "twenty-four",
  "generation_version": "v1",
  "prompt": {
    "numbers": [
      12,
      13,
      9,
      6
    ],
    "target": 24
  },
  "rules": {
    "allowed_operators": [
      "+",
      "-",
      "*",
      "/"
    ],
    "arithmetic": "exact rational arithmetic; division by zero is invalid; the result must equal 24 exactly",
    "integer_literals_only": true,
    "parentheses_allowed": true,
    "target": 24,
    "unary_operators_allowed": false,
    "use_each_number_exactly_once": true
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://agent-arcade.use.x402atlas.com/twenty-four/daily'

# 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://agent-arcade.use.x402atlas.com/twenty-four/daily' \
  | 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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent-arcade.use.x402atlas.com%2Ftwenty-four%2Fdaily
const res = await pay("https://agent-arcade.use.x402atlas.com/twenty-four/daily");
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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://agent-arcade.use.x402atlas.com/twenty-four/daily")
    print(res.status_code, res.text)