Climate Co2

{
  "annual_growth_ppm": [
    {
      "growth_ppm": 2.2,
      "mean_ppm": 416.41,
      "year": 2021
    },
    {
      "growth_ppm": 2.11,
      "mean_ppm": 418.53,
      "year": 2022
    },
    {
      "growth_ppm": 2.55,
      "mean_ppm": 421.08,
      "year": 2023
    },
    {
      "growth_ppm": 3.52,
      "mean_ppm": 424.6,
      "year": 2024
    },
    {
      "growth_ppm": 2.74,
      "mean_ppm": 427.35,
      "year": 2025
    }
  ],
  "latest_month": {
    "deseasonalized_ppm": 429.55,
    "month": 9,
    "ppm": 426.07,
    "year": 2026
  },
  "latest_week": {
    "date": "2026-10-04",
    "one_year_ago_ppm": 424.69,
    "ppm": 426.26,
    "ten_years_ago_ppm": 401.15
  },
  "pre_industrial_ppm": 280,
  "source": "NOAA Global Monitoring Laboratory",
  "station": "Mauna Loa, Hawaii",
  "ten_year_change_ppm": 24.84,
  "year_over_year_ppm": 1.7
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://saylorinnovations.com/api/climate/co2'

# 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://saylorinnovations.com/api/climate/co2' \
  | 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%2Fsaylorinnovations.com%2Fapi%2Fclimate%2Fco2
const res = await pay("https://saylorinnovations.com/api/climate/co2");
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://saylorinnovations.com/api/climate/co2")
    print(res.status_code, res.text)