Library Public Domain Check

{
  "author": "F. Scott Fitzgerald",
  "author_died": 1940,
  "catalogue_hits": [
    {
      "authors": "Austen, Jane, 1775-1817",
      "formats": [
        {
          "format": "epub",
          "url": "https://www.gutenberg.org/ebooks/1342.epub3.images"
        },
        {
          "format": "txt",
          "url": "https://www.gutenberg.org/ebooks/1342.txt.utf-8"
        }
      ],
      "id": "gutenberg:1342",
      "kind": "book",
      "language": "en",
      "rights": "public-domain-us",
      "source": "gutenberg",
      "title": "Pride and Prejudice",
      "url": "https://www.gutenberg.org/ebooks/1342"
    }
  ],
  "in_catalogue": true,
  "published": 1925,
  "title": "The Great Gatsby",
  "verdicts": {
    "canada": "public domain (author died 1940, life+50 rule applied as death was before 1972)",
    "uk_eu": "public domain (author died 1940, 70 years passed)",
    "us": "public domain (published before 1931)"
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://intel.rallylive.ca/library/public-domain-check?query=The+Great+Gatsby+%7C+F.+Scott+Fitzgerald+%7C+1925'

# 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://intel.rallylive.ca/library/public-domain-check?query=The+Great+Gatsby+%7C+F.+Scott+Fitzgerald+%7C+1925' \
  | 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fintel.rallylive.ca%2Flibrary%2Fpublic-domain-check
const res = await pay("https://intel.rallylive.ca/library/public-domain-check?query=The+Great+Gatsby+%7C+F.+Scott+Fitzgerald+%7C+1925");
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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://intel.rallylive.ca/library/public-domain-check?query=The+Great+Gatsby+%7C+F.+Scott+Fitzgerald+%7C+1925")
    print(res.status_code, res.text)