Chess Daily

{
  "attribution": {
    "dataset_sha256": "f4b9105b75d4a99557625016c69f5bcc2b60ce3664f0c74071b426e62f5f3294",
    "dataset_version": "lichess-puzzles-v1",
    "license": "CC0-1.0",
    "snapshot_date": "2026-07-29",
    "source": "Lichess puzzle database"
  },
  "challenge_id": "sha256:50697ebea7b2cc5947da85e12fe2069f49983c4ba3d206b09540d80733c0153a",
  "date": "2026-07-01",
  "difficulty": "normal",
  "game": "chess",
  "generation_version": "v1",
  "prompt": {
    "answer_format": "uci_move_array",
    "fen": "r4rk1/5ppp/1np2q2/p1b5/2p1B3/P7/1P3PPP/R1BQ1RK1 w - - 2 18",
    "puzzle_id": "00143",
    "rating": 1825,
    "side_to_move": "white",
    "themes": [
      "advantage",
      "middlegame",
      "short"
    ]
  },
  "rules": {
    "complete_principal_line_required": true,
    "maximum_moves": 16,
    "notation": "uci"
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://agent-arcade.use.x402atlas.com/chess/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/chess/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%2Fchess%2Fdaily
const res = await pay("https://agent-arcade.use.x402atlas.com/chess/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/chess/daily")
    print(res.status_code, res.text)