Commodities Copper

{
  "briefing_metadata": {
    "correlations_count": 2,
    "description": "Copper through a copper futures fund (CPER), speculators' net position in COMEX copper futures (CFTC), the World Bank's monthly copper price, and the dollar and gold funds beside it, each with its measured relationship to the copper fund.",
    "metrics_count": 6,
    "name": "Commodities Copper"
  },
  "briefing_used": "commodities.copper",
  "metrics": {
    "copper-gold-ratio": {
      "name": "copper-gold-ratio"
    },
    "cot-copper-noncomm-net": {
      "name": "cot-copper-noncomm-net"
    },
    "etf-cper": {
      "name": "etf-cper"
    },
    "etf-gld": {
      "name": "etf-gld"
    },
    "etf-uup": {
      "name": "etf-uup"
    },
    "wb-copper-usd-mt": {
      "name": "wb-copper-usd-mt"
    }
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.prereason.com/api/commodities/copper?format=json'

# 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://api.prereason.com/api/commodities/copper?format=json' \
  | 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 $0.03 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.03" });
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 $0.03 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.prereason.com%2Fapi%2Fcommodities%2Fcopper
const res = await pay("https://api.prereason.com/api/commodities/copper?format=json");
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 $0.03 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.03"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://api.prereason.com/api/commodities/copper?format=json")
    print(res.status_code, res.text)